def sdram_sdr_controller(clock, reset, ibus, extram, refresh=True):
""" SDRAM controller
This module is an SDRAM controller to interface and control
SDRAM modules. This module contains a state-machine that
controls the different SDRAM modes including refresh etc.
This module provides the translation from a flat memory-mapped
bus (e.g. Wishbone, Avalon, AXI, etc.) to the SDRAM interface.
Also intended to support memory-mapped and streaming (FIFO
mode). In streaming / FIFO mode the external memory acts as
one large FIFO. The SDRAM controller type is determine by
the internal interface (ibus) passed.
This SDRAM controller is a port of the Xess SDRAM controller
for the Xula boards.
https://github.com/xesscorp/XuLA/blob/master/FPGA/XuLA_lib/SdramCntl.vhd
"""
States = enum('INITWAIT', 'INITPCHG', 'INITSETMODE', 'INITRFSH',
'RW', 'ACTIVATE', 'REFRESHROW', 'SELFREFRESH')
Commands = enum('nop', 'active', 'read', 'write',
'pchg', 'mode', 'rfsh',
encoding='binary')
cmdlut = (intbv('011100')[5:],
intbv('001100')[5:],
intbv('010100')[5:],
intbv('010000')[5:],
intbv('001000')[5:],
intbv('000000')[5:],
intbv('000100')[5:])
sdram = extram
sdram.cmd = Signal(intbv(0)[5:])
timer = Signal(intbv(0, min=0, max=sdram.cyc_init))
ras_timer = Signal(intbv(0, min=0, max=sdram.cyc_ras))
wr_timer = Signal(intbv(0, min=0, max=sdram.cyc_wr))
state = Signal(States.INITWAIT)
@always_seq(clock.posedge, reset=reset)
def rtl_sdram_controller():
# this is one big state-machine but ...
if state == States.INITWAIT:
if sdram.lock:
timer.next = sdram.cyc_init
state.next = States.initpchg
else:
sdram.sd_cke.next = False
sdram.status.next = 1
elif state == States.INITPCHG:
sdram.cmd.next = Commands.PCHG
sdram.addr[CMDBITS] = Commands.ALL_BANKS
timer.next = sdram.cycles
return rtl_sdram_controller
def whitebox_reset(resetn, dac_clock, clear_enable, clearn):
state_t = enum('CLEAR', 'CLEARING', 'RUN')
state = Signal(state_t.CLEAR)
sync_clear_en = Signal(bool(0))
clear_en = Signal(bool(0))
clear_count = Signal(intbv(0)[10:])
@always_seq(dac_clock.posedge, reset=resetn)
def controller():
sync_clear_en.next = clear_enable
clear_en.next = sync_clear_en
if state == state_t.CLEAR:
clearn.next = 0
clear_count.next = 16
state.next = state_t.CLEARING
elif state == state_t.CLEARING:
clear_count.next = clear_count - 1
if clear_count == 0:
state.next = state_t.RUN
else:
state.next = state_t.CLEARING
if state == state_t.RUN:
clearn.next = 1
if clear_en:
state.next = state_t.CLEAR
return controller
def cezar(clk, reset, y, x):
state_t = enum('enc', 'dec')
accumulator = Signal(intbv(0)[32:])
counter = Signal(intbv(0)[32:])
state = Signal(state_t.COUNT)
message = Signal(intbv(0)[4:])
key = Signal(intbv(0)[3:].signed())
@always_seq(clk.posedge, reset=reset)
def enc_proc():
if state == state_t.dec:
key.next = -key
x.next = message + key
if x > 15:
x.next = 0 + key
elif x < 0:
x.next = 15 + key
elif state == state_t.enc:
key.next = key
x.next = message + key
if x > 15:
x.next = 0 + key
elif x < 0:
x.next = 15 + key
else:
raise ValueError("Undefined state")
return instances()
def get_fmax(fn, info):
log = open(fn, 'r')
fmax = []
States = enum('search', 'fmax')
state = States.search
glncnt, lncnt = 0, 0
for ln in log:
if state == States.search:
if glncnt > 100 and 'Fmax Summary' in ln:
lncnt = 1
state = States.fmax
elif state == States.fmax:
if lncnt == 5:
fstr = ln.split(';')
if len(fstr) < 2:
state = States.search
continue
fstr = fstr[1].split()
fstr = fstr[0].strip()
fmax.append(fstr)
if lncnt >= 6:
state = States.search
lncnt += 1
glncnt += 1
if len(fmax) > 0:
info['fmax'] = min(map(float, fmax))
else:
info['fmax'] = -1
return info
def testUniqueLiterals(self):
try:
t_State = enum("SEARCH", "CONFIRM", "SEARCH")
except ValueError:
pass
else:
self.fail()
def get_fmax(fn, info):
log = open(fn, 'r')
fmax = []
States = enum('search', 'fmax')
state = States.search
glncnt,lncnt = 0,0
for ln in log:
if state == States.search:
if glncnt > 100 and ln.find('Fmax Summary') != -1:
lncnt = 1
state = States.fmax
elif state == States.fmax:
if lncnt == 5:
fstr = ln.split(';')
if len(fstr) < 2:
state = States.search
continue
fstr = fstr[1].split()
fstr = fstr[0].strip()
fmax.append(fstr)
if lncnt >= 6:
state = States.search
lncnt += 1
glncnt += 1
if len(fmax) > 0:
info['fmax'] = min(map(float, fmax))
else:
info['fmax'] = -1
return info
def gen_wbs_stm(self, *operations):
"""
State machine generator for slave
This function generate the state signal and generator for the state machine
Basic operations: Single read/write, Block read/write
Arguments:
* operations: a list of optional supported operations for the state machine.
Example:
mygen = wishbone_slave_generator(theslave)
mygen.gen_wbs_stm("")
"""
# states definition
self.wbsstate_t = enum("wbs_idle", "wbs_incycle", "wbs_read_wait", "wbs_write_wait")
self.wbsstate_cur = Signal(self.wbsstate_t.wbs_idle)
# flag answer signals
self.flagbusy = Signal(intbv(0)[1:])
self.flagerr = Signal(intbv(0)[1:])
# throttle flag
self.flagwait = Signal(intbv(0)[1:])
# state machine: transitions
@always(self.wbssig.CLK_I.posedge, self.wbssig.RST_I.negedge)
def wbsstate_proc():
if self.wbssig.RST_I = 1:
self.wbsstate_cur.next = self.wbsstate_t.wbs_idle
else:
def uart_tx(tx_bit, tx_valid, tx_byte, tx_clk, tx_rst):
index = Signal(intbv(0, min=0, max=8))
st = enum('IDLE', 'START', 'DATA')
state = Signal(st.IDLE)
@always(tx_clk.posedge, tx_rst.negedge)
def fsm():
if tx_rst == 0:
tx_bit.next = 1
index.next = 0
state.next = st.IDLE
else:
if state == st.IDLE:
tx_bit.next = 1
if tx_valid: # a pulse
state.next = st.START
elif state == st.START:
tx_bit.next = 0
index.next = 7
state.next = st.DATA
elif state == st.DATA:
tx_bit.next = tx_byte[index]
if index == 0:
state.next = st.IDLE
else:
index.next = index - 1
return fsm
def sigmoid(t_clk, t_reset, t_y_out, t_x, t_prec=4, fraction=16):
"""
:param x:
:param prec:
:return:
"""
const_1 = Signal(intbv(65536)[32:])
state_t = enum('count', 'result')
state = Signal(state_t.count)
accumulator = Signal(intbv(0)[32:])
counter = Signal(intbv(0)[32:])
t_exp_out, t_exp_end = [Signal(intbv(0)[32:]) for i in range(2)]
t_exp_start = Signal(intbv(1)[32:])
exponential_1 = exponential(t_clk, t_reset, t_exp_out, t_x.tdata, t_exp_end, t_exp_start, t_prec, fraction)
@always_seq(t_clk.posedge, reset=t_reset)
def sigmoids():
"""
:return:
"""
if state == state_t.count:
if t_exp_end == 1:
t_exp_start.next = 0
accumulator.next = ((t_exp_out << fraction) // (t_exp_out + const_1))
state.next = state_t.result
elif state == state_t.result:
t_exp_start.next = 1
t_y_out.tdata.next = accumulator
state.next = state_t.count
else:
raise ValueError("Undefined state")
return instances()
def iir_sliding_window(clk, rstn, ready, input, output, samples, count):
c_floating_bit = ceil(log2(samples)) + 3
c_mantissa_bit = ceil(log2(count))
c_bit_count = c_mantissa_bit + c_floating_bit
c_gain = round(2**c_floating_bit - (samples / count))
t_state = enum("idle", "update_request")
s_internal = Signal(intbv(0)[c_bit_count:])
s_state = Signal(t_state.idle)
@always_seq(clk.posedge, rstn)
def on_clock():
if ready and s_state == t_state.idle:
if input:
v_error = s_internal[:c_floating_bit] >= (count - 1)
output.next = v_error
if not v_error:
s_internal.next = s_internal + 2**c_floating_bit
s_state.next = t_state.update_request
elif s_state == t_state.update_request:
v_value = intbv(int(s_internal))[(c_bit_count + c_floating_bit):]
v_value *= c_gain
s_internal.next = v_value[:c_floating_bit]
output.next = False
s_state.next = t_state.idle
return on_clock
def __init__(self, intf):
""" SDRAM Model
This will model the behavior and cycle accurate interface to
an SDRAM device.
Usage:
extmembus = SDRAMInterface() # interface and transactors
sdram_model = SDRAMModel(extmembus) # model
sdram_proc = sdram_model.process() # send to simulator
This model implements the functionality described in the Micron
datasheet for a 256Mb device:
http://www.micron.com/parts/dram/sdram/mt48lc16m16a2b4-6a-it?pc=%7B5144650B-31FA-410A-993E-BADF981C54DD%7D
Not convertible.
"""
assert isinstance(intf, SDRAMInterface)
# external interface to the controller, the SDRAM interface
# also contains the SDRAM timing parameters.
self.intf = intf
# emulate banks in an SDRAM
self.banks = [{} for _ in range(intf.num_banks)]
# typically DRAM is defined using states (@todo add reference)
self.States = enum("IDLE", "ACTIVE")
self.Commands = intf.Commands
def __init__(self, intf):
""" SDRAM Model
This will model the behavior and cycle accurate interface to
an SDRAM device.
Usage:
extmembus = SDRAMInterface() # interface and transactors
sdram_model = SDRAMModel(extmembus) # model
sdram_proc = sdram_model.process() # send to simulator
This model implements the functionality described in the Micron
datasheet for a 256Mb device:
http://www.micron.com/parts/dram/sdram/mt48lc16m16a2b4-6a-it?pc=%7B5144650B-31FA-410A-993E-BADF981C54DD%7D
Not convertible.
"""
assert isinstance(intf, SDRAMInterface)
# external interface to the controller, the SDRAM interface
# also contains the SDRAM timing parameters.
self.intf = intf
# emulate banks in an SDRAM
self.banks = [{} for _ in range(intf.num_banks)]
# typically DRAM is defined using states (@todo add reference)
self.States = enum("IDLE", "ACTIVE")
self.Commands = intf.Commands
def whitebox_reset(resetn,
dac_clock,
clear_enable,
clearn):
state_t = enum('CLEAR', 'CLEARING', 'RUN')
state = Signal(state_t.CLEAR)
sync_clear_en = Signal(bool(0))
clear_en = Signal(bool(0))
clear_count = Signal(intbv(0)[10:])
@always_seq(dac_clock.posedge, reset=resetn)
def controller():
sync_clear_en.next = clear_enable
clear_en.next = sync_clear_en
if state == state_t.CLEAR:
clearn.next = 0
clear_count.next = 16
state.next = state_t.CLEARING
elif state == state_t.CLEARING:
clear_count.next = clear_count - 1
if clear_count == 0:
state.next = state_t.RUN
else:
state.next = state_t.CLEARING
if state == state_t.RUN:
clearn.next = 1
if clear_en:
state.next = state_t.CLEAR
return controller
def uarttx(glbl, fbustx, tx, baudce):
"""UART transmitter function
Arguments(Ports):
glbl : rhea.Global interface, clock and reset
fbustx : FIFOBus interface to the TX fifo
tx : The actual transmition line
Parameters:
baudce : The transmittion baud rate
myhdl convertible
"""
clock, reset = glbl.clock, glbl.reset
states = enum('wait', 'start', 'byte', 'stop', 'end')
state = Signal(states.wait)
txbyte = Signal(intbv(0)[8:])
bitcnt = Signal(intbv(0, min=0, max=9))
@always_seq(clock.posedge, reset=reset)
def beh_tx():
# default values
fbustx.read.next = False
# state handlers
if state == states.wait:
if not fbustx.empty and baudce:
txbyte.next = fbustx.read_data
fbustx.read.next = True
state.next = states.start
elif state == states.start:
if baudce:
bitcnt.next = 0
tx.next = False
state.next = states.byte
elif state == states.byte:
if baudce:
bitcnt.next = bitcnt + 1
tx.next = txbyte[bitcnt]
elif bitcnt == 8:
state.next = states.stop
bitcnt.next = 0
elif state == states.stop:
if baudce:
tx.next = True
state.next = states.end
elif state == states.end:
if baudce:
state.next = states.wait
else:
assert False, "Invalid state %s" % (state)
return myhdl.instances()
def uarttx(glbl, fbustx, tx, baudce):
"""UART transmitter function
Arguments(Ports):
glbl : rhea.Global interface, clock and reset
fbustx : FIFOBus interface to the TX fifo
tx : The actual transmition line
Parameters:
baudce : The transmittion baud rate
myhdl convertible
"""
clock, reset = glbl.clock, glbl.reset
states = enum("wait", "start", "byte", "stop", "end")
state = Signal(states.wait)
txbyte = Signal(intbv(0)[8:])
bitcnt = Signal(intbv(0, min=0, max=9))
@always_seq(clock.posedge, reset=reset)
def beh_tx():
# default values
fbustx.read.next = False
# state handlers
if state == states.wait:
if not fbustx.empty and baudce:
txbyte.next = fbustx.read_data
fbustx.read.next = True
state.next = states.start
elif state == states.start:
if baudce:
bitcnt.next = 0
tx.next = False
state.next = states.byte
elif state == states.byte:
if baudce:
bitcnt.next = bitcnt + 1
tx.next = txbyte[bitcnt]
elif bitcnt == 8:
state.next = states.stop
bitcnt.next = 0
elif state == states.stop:
if baudce:
tx.next = True
state.next = states.end
elif state == states.end:
if baudce:
state.next = states.wait
else:
assert False, "Invalid state %s" % (state)
return myhdl.instances()
def uart_rx(clk_i, rst_i, rx_tick_i, rx_i, dat_o, ready_o):
RXTICKX = 8
NBITSP = log2up(RXTICKX)
NBITSTART = NBITSP - 1
rx_sync = createSignal(0b111, 3)
rx_r = createSignal(1, 1)
bit_spacing = createSignal(0, NBITSP)
bit_start = createSignal(0, NBITSTART)
nxt_bit = createSignal(0, 1)
bit_cnt = createSignal(0, 3)
dat_r = createSignal(0, 8)
rx_state = hdl.enum('IDLE', 'DATA', 'STOP')
state = hdl.Signal(rx_state.IDLE)
@hdl.always_seq(clk_i.posedge, reset=rst_i)
def rx_sync_proc():
if rx_tick_i:
rx_sync.next = hdl.concat(rx_sync[2:0], rx_i)
@hdl.always_comb
def assign_proc():
rx_r.next = rx_sync == 0b111 or rx_sync == 0b011 or rx_sync == 0b101 or rx_sync == 0b110
dat_o.next = dat_r
@hdl.always_seq(clk_i.posedge, reset=rst_i)
def nxt_bit_proc():
nxt_bit.next = bit_spacing == RXTICKX - 1
if rx_tick_i and state != rx_state.IDLE:
bit_spacing.next = bit_spacing + 1
@hdl.always_seq(clk_i.posedge, reset=rst_i)
def start_bit_proc():
if state == rx_state.IDLE and not rx_r:
bit_start.next = bit_start + rx_tick_i
else:
bit_start.next = 0
@hdl.always_seq(clk_i.posedge, reset=rst_i)
def fsm_proc():
ready_o.next = False
if rx_tick_i:
if state == rx_state.IDLE:
if not rx_r and bit_start == hdl.modbv(RXTICKX // 2 -
1)[NBITSTART:]:
state.next = rx_state.DATA
elif state == rx_state.DATA:
if nxt_bit:
dat_r.next = hdl.concat(rx_r, dat_r[8:1])
bit_cnt.next = bit_cnt + 1
if bit_cnt == 7:
state.next = rx_state.STOP
elif state == rx_state.STOP:
if nxt_bit:
state.next = rx_state.IDLE
ready_o.next = True
else:
state.next = rx_state.IDLE
return hdl.instances()
def process(self, glbl, lcd):
"""
"""
self.update_cnt = 0
# ...
self.states = enum('init')
# use a dictionary to capture all the
regfile = {}
# emulate the behavior of the LT24 LCD interface, the min pulses
# (strobes) is 15ns and require 15ns between, the max write rate
# is 33 Mpix/sec. Most (all) commands accept 4 bytes (4 writes)
# for a command.
@instance
def beh():
while True:
command_in_progress = False
# numbytes actually the number of transfers
numbytes, cmdbytes = 0, []
self.reset_cursor()
# wait for a new command
# @todo: add timing checks
yield lcd.csn.negedge
wrn, rdn = bool(lcd.wrn), bool(lcd.rdn)
# handle a transaction (csn low pulse)
while not lcd.csn or command_in_progress:
if lcd.csn and command_in_progress:
regfile[cmd] = copy(cmdbytes)
command_in_progress = False
print("{:<10d}:LT24: cmd 0x{:02X}, numdata {}, data {}".format(
now(), cmd, numbytes, list(map(hex, cmdbytes[:])), ))
# check for rising edge of wrn or rdn
if not wrn and lcd.wrn:
if not lcd.dcn:
# a command received
command_in_progress = True
cmd = int(lcd.data[8:])
if cmd not in regfile:
regfile[cmd] = []
else:
if command_in_progress:
if cmd == 0x2C:
self.update_next_pixel(int(lcd.data))
else:
cmdbytes += [int(lcd.data[8:])]
numbytes += 1
else:
assert False, "Unexpected data!"
wrn, rdn = bool(lcd.wrn), bool(lcd.rdn)
yield delay(2)
return beh
def exponential(t_clk, t_reset, t_y_out, t_x, t_end, t_start, t_prec=4, fraction=16):
"""
:param t_clk:
:param t_reset:
:param t_y_out:
:param t_x:
:param t_prec:
:param t_end:
:param t_start:
:return:
"""
const_1 = Signal(intbv(65536)[32:])
state_t = enum('count', 'result')
state = Signal(state_t.count)
accumulator = Signal(intbv(0)[32:])
y_pow = Signal(intbv(0)[32:])
counter = Signal(intbv(0)[32:])
y_fac = Signal(intbv(1)[32:])
t_pow_end, t_fac_end = [Signal(intbv(0)[32:]) for i in range(2)]
t_pow_start, t_fac_start = [Signal(intbv(1)[32:]) for i in range(2)]
power_1 = power(t_clk, t_reset, y_pow, t_x, counter, t_pow_end, t_pow_start)
factorial_1 = factorial(t_clk, t_reset, y_fac, counter, t_fac_end, t_fac_start)
@always_seq(t_clk.posedge, reset=t_reset)
def exponentials():
"""
:return:
"""
if state == state_t.count:
if t_start == 1:
t_end.next = 0
if t_pow_end == 1 and t_fac_end == 1:
t_pow_start.next = 0
t_fac_start.next = 0
if counter == 0:
counter.next = 1
accumulator.next = const_1
else:
accumulator.next = accumulator + ((y_pow << fraction) << fraction) // (y_fac << fraction)
counter.next = counter + 1
if counter > t_prec-1:
state.next = state_t.result
counter.next = 0
t_pow_start.next = 1
t_fac_start.next = 1
elif state == state_t.result:
t_pow_start.next = 1
t_fac_start.next = 1
t_end.next = 1
t_y_out.next = accumulator
accumulator.next = const_1
state.next = state_t.count
else:
raise ValueError("Undefined state")
return instances()
def process(self, glbl, vga):
"""
"""
# keep track of the number of updates
self.update_cnt = 0
# VGA driver essentially a state-machine with the following
# states. Typically implemented as a bunch of counters.
self.States = enum('INIT', 'DISPLAY',
'HFP', 'HSYNC', 'HBP',
'VFP', 'VSYNC', 'VBP',
'END')
# state table, small function to handle each state
self.StateFuncs = {
self.States.INIT: None,
self.States.DISPLAY: self._state_display,
self.States.HFP: self._state_hor_front_porch,
self.States.HSYNC: self._state_hor_sync,
self.States.HBP: self._state_hor_back_porch,
self.States.VFP: self._state_ver_front_porch,
self.States.VSYNC: self._state_ver_sync,
self.States.VBP: self._state_ver_back_porch,
self.States.END: None
}
self.state = self.States.INIT
counters = Counters()
# montior signals for debugging
#_state = Signal(intbv(0, min=0, max=len(self.States)))
_state = Signal(str(""))
hcnt = Signal(intbv(0)[16:])
vcnt = Signal(intbv(0)[16:])
# end monitors
@instance
def g_capture_vga():
while True:
#print(self.state)
if self.state == self.States.INIT:
print("%10d Screen update, %d, in progress" % (now(), self.update_cnt))
counters.reset()
self.state = self.States.DISPLAY
elif self.state == self.States.END:
self.state = self.States.INIT
else:
yield self.StateFuncs[self.state](glbl, vga, counters)
# monitor, sample each variable at each clock
@always(glbl.clock.posedge)
def g_monitor():
_state.next = self.state._name
hcnt.next = counters.hcnt
vcnt.next = counters.vcnt
return g_capture_vga, g_monitor
def process(self, glbl, vga):
"""
"""
# keep track of the number of updates
self.update_cnt = 0
# VGA driver essentially a state-machine with the following
# states. Typically implemented as a bunch of counters.
self.States = enum('INIT', 'DISPLAY',
'HFP', 'HSYNC', 'HBP',
'VFP', 'VSYNC', 'VBP',
'END')
# state table, small function to handle each state
self.StateFuncs = {
self.States.INIT: None,
self.States.DISPLAY: self._state_display,
self.States.HFP: self._state_hor_front_porch,
self.States.HSYNC: self._state_hor_sync,
self.States.HBP: self._state_hor_back_porch,
self.States.VFP: self._state_ver_front_porch,
self.States.VSYNC: self._state_ver_sync,
self.States.VBP: self._state_ver_back_porch,
self.States.END: None
}
self.state = self.States.INIT
counters = Counters()
# montior signals for debugging
#_state = Signal(intbv(0, min=0, max=len(self.States)))
_state = Signal(str(""))
hcnt = Signal(intbv(0)[16:])
vcnt = Signal(intbv(0)[16:])
# end monitors
@instance
def g_capture_vga():
while True:
#print(self.state)
if self.state == self.States.INIT:
print("%10d Screen update, %d, in progress" % (now(), self.update_cnt))
counters.reset()
self.state = self.States.DISPLAY
elif self.state == self.States.END:
self.state = self.States.INIT
else:
yield self.StateFuncs[self.state](glbl, vga, counters)
# monitor, sample each variable at each clock
@always(glbl.clock.posedge)
def g_monitor():
_state.next = self.state._name
hcnt.next = counters.hcnt
vcnt.next = counters.vcnt
return g_capture_vga, g_monitor
def ram_interface(ram, wb_bus, pattern_mode, clock, config):
"""
Instantiate a RAM interface for simulation
ram : RAM Array, should be [Signal(modbv(0)[xlen:]) for ii in range(0, ram_size)]
wb_bus: Wishbone bus (class CacheMasterWishboneBundle)
pattern_mode : if True, insted of RAM content an address dependant pattern is read
clock, reset : Clock and reset
config : CacheConfig
"""
t_mstate = enum('m_idle', 'm_burst')
m_state = Signal(t_mstate.m_idle)
def get_pattern(adr):
bitpos = 0
word_adr = modbv(0)[wb_bus.adrLow:]
d = modbv(0)[config.master_data_width:]
for i in range(0, config.master_data_width // 32):
d[bitpos + 32:bitpos] = concat(adr, word_adr)
bitpos += 32
word_adr += 4
return d
@always_comb
def mem_read():
if wb_bus.wbm_stb_o and not wb_bus.wbm_we_o:
if pattern_mode:
wb_bus.wbm_db_i.next = get_pattern(wb_bus.wbm_adr_o)
else:
assert wb_bus.wbm_adr_o < len(
ram), "Out of bound RAM access to address {}".format(
wb_bus.wbm_adr_o)
wb_bus.wbm_db_i.next = ram[wb_bus.wbm_adr_o]
@always(clock.posedge)
def mem_simul():
if wb_bus.wbm_cyc_o and wb_bus.wbm_stb_o and wb_bus.wbm_we_o:
for i in range(0, len(wb_bus.wbm_sel_o)):
if wb_bus.wbm_sel_o[i]:
ram[wb_bus.wbm_adr_o].next[(i + 1) * 8:i *
8] = wb_bus.wbm_db_o[(i + 1) *
8:i * 8]
if m_state == t_mstate.m_idle:
if wb_bus.wbm_cyc_o and wb_bus.wbm_stb_o:
m_state.next = t_mstate.m_burst
wb_bus.wbm_ack_i.next = True
else:
if wb_bus.wbm_cti_o == 0b000 or wb_bus.wbm_cti_o == 0b111:
wb_bus.wbm_ack_i.next = False
m_state.next = t_mstate.m_idle
return instances()
def uarttx(glbl, fbustx, tx, baudce):
"""
"""
clock, reset = glbl.clock, glbl.reset
states = enum('wait', 'start', 'byte', 'stop', 'end')
state = Signal(states.wait)
txbyte = Signal(intbv(0)[8:])
bitcnt = Signal(intbv(0, min=0, max=9))
@always_seq(clock.posedge, reset=reset)
def rtltx():
# default values
fbustx.rd.next = False
# state handlers
if state == states.wait:
if not fbustx.empty and baudce:
txbyte.next = fbustx.rdata
fbustx.rd.next = True
state.next = states.start
elif state == states.start:
if baudce:
bitcnt.next = 0
tx.next = False
state.next = states.byte
elif state == states.byte:
if baudce:
bitcnt.next = bitcnt + 1
tx.next = txbyte[bitcnt]
elif bitcnt == 8:
state.next = states.stop
bitcnt.next = 0
elif state == states.stop:
if baudce:
tx.next = True
state.next = states.end
elif state == states.end:
if baudce:
state.next = states.wait
else:
assert False, "Invalid state %s" % (state)
return rtltx
def uarttx(glbl, fbustx, tx, baudce):
"""
"""
clock, reset = glbl.clock, glbl.reset
states = enum('wait', 'start', 'byte', 'stop', 'end')
state = Signal(states.wait)
txbyte = Signal(intbv(0)[8:])
bitcnt = Signal(intbv(0, min=0, max=9))
@always_seq(clock.posedge, reset=reset)
def rtltx():
# default values
fbustx.rd.next = False
# state handlers
if state == states.wait:
if not fbustx.empty and baudce:
txbyte.next = fbustx.rdata
fbustx.rd.next = True
state.next = states.start
elif state == states.start:
if baudce:
bitcnt.next = 0
tx.next = False
state.next = states.byte
elif state == states.byte:
if baudce:
bitcnt.next = bitcnt + 1
tx.next = txbyte[bitcnt]
elif bitcnt == 8:
state.next = states.stop
bitcnt.next = 0
elif state == states.stop:
if baudce:
tx.next = True
state.next = states.end
elif state == states.end:
if baudce:
state.next = states.wait
else:
assert False, "Invalid state %s" % (state)
return rtltx
def test(clock, reset, axis_source, axis_sink):
return_objects = []
return_objects.append(
self.axis_buffer_check(
clock, reset, axis_source, axis_sink,
max_n_samples=max_n_samples,
randomise_axis_control_signals=True))
return_objects.append(self.count_tests(clock, n_tests))
t_stim_state = enum(
'UNINTERRUPTED', 'AWAIT_DATA', 'RESET', 'HOLD')
stim_state = Signal(t_stim_state.UNINTERRUPTED)
@always(clock.posedge)
def reset_stim():
if stim_state == t_stim_state.UNINTERRUPTED:
# Allow an uninterrupted packet
if (axis_sink.TVALID and
axis_sink.TREADY and
axis_sink.TLAST):
# One full packet has gone through the buffer
stim_state.next = t_stim_state.AWAIT_DATA
elif stim_state == t_stim_state.AWAIT_DATA:
# Await the next packet
if axis_sink.TVALID:
# The next packet has started
stim_state.next = t_stim_state.RESET
elif stim_state == t_stim_state.RESET:
if random.random() < 0.1:
# Randomly send a reset
reset.next = True
stim_state.next = t_stim_state.HOLD
elif stim_state == t_stim_state.HOLD:
if random.random() < 0.2:
# Keep reset high for a random period
reset.next = False
stim_state.next = t_stim_state.UNINTERRUPTED
return_objects.append(reset_stim)
return return_objects
def uart_tx(clk_i, rst_i, tx_tick_i, dat_i, start_i, ready_o, tx_o):
cnt = createSignal(0, 4) # Contará de 0 a 9
data = createSignal(0, 8) # Ancho del FIFO
tx_state = hdl.enum('IDLE', 'TX') # 2 estados de la FSM
state = hdl.Signal(tx_state.IDLE) # Estado inicial de estoy ocioso
@hdl.always_seq(clk_i.posedge, reset=rst_i)
def tx_state_m(): # 50MHz
if state == tx_state.IDLE:
ready_o.next = 1
if start_i: # Condición para cambiar de estado
data.next = dat_i
ready_o.next = 0
state.next = tx_state.TX
else:
tx_o.next = 1
elif state == tx_state.TX:
if tx_tick_i: #Usando el divisor del clk_i
#lectura de los 8 bits que nos impartan para el caracter
if cnt >= 1 and cnt <= 8:
tx_o.next = data[0]
data.next = hdl.concat(
False,
data[8:1]) #Usando una logica similar al uart_rx
cnt.next = cnt + 1
else:
tx_o.next = 0
cnt.next = cnt + 1
#cuando termina de leer el ultimo bit del caracter, reinicia todo.
if cnt == 9:
tx_o.next = 1
ready_o.next = 1
state.next = tx_state.IDLE
cnt.next = 0
else:
state.next = tx_state.IDLE #Default
return hdl.instances()
# Local Variables:
# flycheck-flake8-maximum-line-length: 200
# flycheck-flake8rc: ".flake8rc"
# End:
def gen_wbm_stm(self, *operations):
"""
State machine generator for master
This function generate the state signal and generator for the state machine
Basic operations: Single read/write, Block read/write
Arguments:
* operations: a list of optional supported operations for the state machine.
Example:
mygen = wishbone_master_generator(themaster)
mygen.gen_wbm_stm("")
"""
# states definition
self.wbmstate_t = enum("wbm_idle", "wbm_incycle", "wbm_read_wait", "wbm_write_wait", "wbm_rmw_rdwait", "wbm_rmw_midwait", "wbm_rmw_wrwait")
self.wbmstate_cur = Signal(self.wbmstate_t.wbm_idle)
# list of trigger signals and related states
self.list_trigsignals = []
for i in zip(("trig_read", "trig_write", "trig_rmw"), self.wbmstate_t._names[2:5]):
self.list_trigsignals.append({"name": i[0], "initstate": i[1], "trig": Signal(intbv(0)[1:])})
# Vector of triggers: for use in state machine
trig_vector = Signal(intbv(0)[3:])
trig_list = (x["trig"] for x in self.list_trigsignals)
@always_comb
def trigvectgen():
trig_vector.next = concat(*trig_list)
# Vector of acknowledge signals: for use in state machine
ack_list = [self.ACK_I]
if self.RTY_I != None:
ack_list.append(self.RTY_I)
if self.ERR_I != None:
ack_list.append(self.ERR_I)
ack_vector = Signal(intbv(0)[len(ack_list):])
# the error signals can be sliced with [1:]
@always_comb
def ackvectgen():
ack_vector.next = concat(*ack_list)
# state machine: transitions
@always(self.wbmsig.CLK_I.posedge, self.wbmsig.RST_I.negedge)
def wbmstate_proc():
if self.wbmsig.RST_I = 1:
self.wbmstate_cur.next = self.wbmstate_t.wbm_idle
else:
def PS2Keyboard(
code,
finish,
kb_dat,
kb_clk,
rst
):
States = enum('READ', 'FINISH')
state = Signal(States.FINISH)
# Eight Data bits and One Parity.
bits = [Signal(bool(0)) for k in range(9)]
code_reg = ConcatSignal(*bits)
bit_counter = Signal(intbv(0, min=0, max=10))
@always_seq(kb_clk.posedge, reset=rst)
def receiving():
if state == States.FINISH:
if not kb_dat:
# kb_dat=0, device starts a new transmission.
state.next = States.READ
finish.next = 0
else:
# kb_dat=1, the stop bit.
code.next = code_reg
finish.next = 1
elif state == States.READ:
# Shift Register.
bits[0].next = kb_dat
for k in range(1, 9):
bits[k].next = bits[k-1]
# End Shift Register.
if bit_counter == 8:
# Have got all the 8bits and parity.
state.next = States.FINISH
bit_counter.next = 0
else:
bit_counter.next = bit_counter + 1
else:
raise ValueError('Undefined state.')
return instances()
def apb3_simple_slave(bus, status_led):
bus_presetn = bus.presetn
bus_pclk = bus.pclk
bus_paddr = bus.paddr
bus_psel = bus.psel
bus_penable = bus.penable
bus_pwrite = bus.pwrite
bus_pwdata = bus.pwdata
bus_pready = bus.pready
bus_prdata = bus.prdata
bus_pslverr = bus.pslverr
state_t = enum(
'IDLE',
'DONE',
)
state = Signal(state_t.IDLE)
counter = Signal(intbv(0)[len(bus_prdata):])
@always_seq(bus_pclk.posedge, reset=bus_presetn)
def state_machine():
status_led.next = counter[0]
if state == state_t.IDLE:
if bus_penable and bus_psel:
if bus_paddr[8:] == 0x40:
bus_pready.next = False
if bus_pwrite:
counter.next = bus_pwdata
state.next = state_t.DONE
else:
bus_prdata.next = counter
counter.next = counter + 1
state.next = state_t.DONE
else:
state.next = state_t.DONE
else:
state.next = state_t.IDLE
elif state == state_t.DONE:
bus_pready.next = True
state.next = state_t.IDLE
return state_machine
def my_sum(clk, reset, axis_s_raw, axis_m_sum):
state_t = enum('CALCULATE', 'END', 'START')
vin = Signal(intbv(0)[32:].signed())
Vin = Signal(intbv(0)[32:].signed())
Vout = Signal(intbv(0)[32:].signed())
d = Signal(intbv(0)[32:].signed())
state = Signal(state_t.START)
@always_seq(clk.posedge, reset=reset)
def sum_proc():
if state == state_t.START:
Vout.next = 0
d.next = 0
state.next = state_t.CALCULATE
elif state == state_t.CALCULATE:
axis_m_sum.tvalid.next = 1
axis_m_sum.tlast.next = 0
axis_s_raw.tready.next = 1
if axis_s_raw.tvalid == 1: # jeżeli przyszły dane to:
# vin = #zapisz gołe dane z IPcore'a
Vin.next = axis_s_raw.tdata * 256 # dane przesunięte w lewo by uzyskać stały przecinek
d.next = (
Vin - Vout
) // 8 # przeliczenie różnicy in-out wraz z przeskalowaniem o arbitralnie ustalony czyn
Vout.next = Vout + d # wpisanie stanu wyjścia do akumulatora
# axis_m_sum.tdata.next: object = Signal(Vout // 256) # wystawienie danych na zewnątrz z przywróceniem miejsca przecinka
axis_m_sum.tdata.next = Vout >> 8 # wystawienie danych na zewnątrz z przywróceniem miejsca przecinka
if axis_s_raw.tlast == 1:
state.next = state_t.END
elif state == state_t.END:
axis_s_raw.tready.next = 0
axis_m_sum.tvalid.next = 1
axis_m_sum.tlast.next = 1
axis_m_sum.tdata.next = d // 256 # Wypisz na koniec skumulowaną wartość offsetu sygnału
if axis_m_sum.tready == 1:
state.next = state_t.START
else:
raise ValueError("Undefined state")
return instances()
def test_val_type_check(self):
'''Signals should be bools or single bit intbvs.
'''
working_test_cases = (('foo', Signal(intbv(0)[1:])), ('bar',
Signal(bool(0))))
for name, signal in working_test_cases:
# Should pass fine
check_bool_signal(signal, name)
test_enum = enum('a', 'b')
failing_test_cases = (('foo', Signal('bleh')),
('foo', Signal(test_enum.a)), ('bar', Signal(
(10))), ('bar', Signal(0)))
for name, signal in failing_test_cases:
self.assertRaisesRegex(
ValueError, 'Port %s signal should be a boolean value or a '
'single bit intbv value.' % (name, ), check_bool_signal,
signal, name)
def __init__(self, system, bus, divider, width=32, strict_sdoe=True):
self.system = system
self.bus = bus
self.states = enum("IDLE", "START", "PRE", "FIRST", "SECOND", "POST",
"PULSE")
self.state = Signal(self.states.IDLE)
self.divider = divider
self.strict_sdoe = strict_sdoe
self.data_reg = Signal(intbv(0)[width:])
self.count = Signal(intbv(0)[8:])
self.count_port = Port(self.count.val)
self.cpha_reg = Signal(False)
self.cpol_reg = Signal(False)
self.pulse_reg = Signal(False)
self.cs_reg = Signal(self.bus.CS.val)
self.div_val = Signal(intbv(0, 0, self.divider + 1))
def __init__(self, system, bus, divider, width = 32, strict_sdoe = True):
self.system = system
self.bus = bus
self.states = enum(
"IDLE", "START", "PRE", "FIRST", "SECOND", "POST", "PULSE")
self.state = Signal(self.states.IDLE)
self.divider = divider
self.strict_sdoe = strict_sdoe
self.data_reg = Signal(intbv(0)[width:])
self.count = Signal(intbv(0)[8:])
self.count_port = Port(self.count.val)
self.cpha_reg = Signal(False)
self.cpol_reg = Signal(False)
self.pulse_reg = Signal(False)
self.cs_reg = Signal(self.bus.CS.val)
self.div_val = Signal(intbv(0, 0, self.divider + 1))
def power(t_clk, t_reset, t_y_out, t_base, t_power, t_end, t_start):
"""
:param t_clk: clock
:param t_reset: reset
:param t_y_out: output
:param t_base:
:param t_power:
:param t_end:
:param t_start:
:return:
"""
state_t = enum('count', 'result')
state = Signal(state_t.count)
accumulator = Signal(intbv(1)[32:])
counter = Signal(intbv(0)[32:])
@always_seq(t_clk.posedge, reset=t_reset)
def powers():
"""
:return:
"""
if state == state_t.count:
if t_start == 1:
t_end.next = 0
accumulator.next = accumulator * t_base
counter.next = counter + 1
if counter >= t_power-1:
state.next = state_t.result
counter.next = 0
elif state == state_t.result:
t_end.next = 1
t_y_out.next = accumulator
accumulator.next = 1
state.next = state_t.count
else:
raise ValueError("Undefined state")
return instances()
def apb3_simple_slave(bus, status_led):
bus_presetn = bus.presetn
bus_pclk = bus.pclk
bus_paddr = bus.paddr
bus_psel = bus.psel
bus_penable = bus.penable
bus_pwrite = bus.pwrite
bus_pwdata = bus.pwdata
bus_pready = bus.pready
bus_prdata = bus.prdata
bus_pslverr = bus.pslverr
state_t = enum('IDLE', 'DONE',)
state = Signal(state_t.IDLE)
counter = Signal(intbv(0)[len(bus_prdata):])
@always_seq(bus_pclk.posedge, reset=bus_presetn)
def state_machine():
status_led.next = counter[0]
if state == state_t.IDLE:
if bus_penable and bus_psel:
if bus_paddr[8:] == 0x40:
bus_pready.next = False
if bus_pwrite:
counter.next = bus_pwdata
state.next = state_t.DONE
else:
bus_prdata.next = counter
counter.next = counter + 1
state.next = state_t.DONE
else:
state.next = state_t.DONE
else:
state.next = state_t.IDLE
elif state == state_t.DONE:
bus_pready.next = True
state.next = state_t.IDLE
return state_machine
def factorial(t_clk, t_reset, t_y_out, t_factorial, t_end, t_start):
"""
:param t_clk:
:param t_reset:
:param t_y_out:
:param t_factorial:
:param t_end:
:param t_start:
:return:
"""
state_t = enum('count', 'result')
state = Signal(state_t.count)
accumulator = Signal(intbv(1)[32:])
counter = Signal(intbv(0)[32:])
@always_seq(t_clk.posedge, reset=t_reset)
def factorials():
if state == state_t.count:
if t_start == 1:
t_end.next = 0
if counter == 0:
counter.next = 1
accumulator.next = 1
else:
accumulator.next = accumulator * counter
counter.next = counter + 1
if counter > t_factorial-1:
state.next = state_t.result
counter.next = 0
elif state == state_t.result:
t_end.next = 1
t_y_out.next = accumulator
accumulator.next = 1
state.next = state_t.count
else:
raise ValueError("Undefined state")
return instances()
def uart_tx(clk_i, rst_i, tx_tick_i, dat_i, start_i, ready_o, tx_o):
cnt = createSignal(0,4) # Contará de 0 a 9
data = createSignal(0,8) # Ancho del FIFO
tx_state = hdl.enum('IDLE','TX') # 2 estados de la FSM
state = hdl.Signal(tx_state.IDLE) # Estado inicial de estoy ocioso
@hdl.always_seq(clk_i.posedge, reset=rst_i)
def tx_state_m(): # 50MHz
if state == tx_state.IDLE:
ready_o.next = 1
if start_i: # Condición para cambiar de estado
data.next = dat_i
ready_o.next = 0
state.next = tx_state.TX
else:
tx_o.next = 1
elif state == tx_state.TX:
if tx_tick_i: #Usando el divisor del clk_i
if cnt >=1 and cnt <= 8:
tx_o.next = data[0]
data.next = hdl.concat(False, data[8:1])
cnt.next = cnt + 1
else:
tx_o.next = 0
cnt.next = cnt + 1
if cnt == 9:
tx_o.next = 1
ready_o.next = 1
state.next = tx_state.IDLE
cnt.next = 0
else:
state.next = tx_state.IDLE
return hdl.instances()
def my_sum(clk, reset, axis_s_raw, axis_m_sum):
state_t = enum('COUNT', 'WRITE_COUNT', 'WRITE_SUM')
accumulator = Signal(intbv(0)[32:])
counter = Signal(intbv(0)[32:])
state = Signal(state_t.COUNT)
@always_seq(clk.posedge, reset=reset)
def sum_proc():
if state == state_t.COUNT:
axis_m_sum.tvalid.next = 0
axis_m_sum.tlast.next = 0
axis_s_raw.tready.next = 1
if axis_s_raw.tvalid == 1:
accumulator.next = accumulator + axis_s_raw.tdata
counter.next = counter + 1
if axis_s_raw.tlast == 1:
state.next = state_t.WRITE_COUNT
elif state == state_t.WRITE_COUNT:
axis_s_raw.tready.next = 0
axis_m_sum.tvalid.next = 1
axis_m_sum.tlast.next = 0
axis_m_sum.tdata.next = counter
if axis_m_sum.tready == 1:
state.next = state_t.WRITE_SUM
counter.next = 0
elif state == state_t.WRITE_SUM:
axis_s_raw.tready.next = 0
axis_m_sum.tvalid.next = 1
axis_m_sum.tlast.next = 1
axis_m_sum.tdata.next = accumulator
if axis_m_sum.tready == 1:
state.next = state_t.COUNT
accumulator.next = 0
else:
raise ValueError("Undefined state")
return instances()
def test_dut_convertible_top_raises_with_enum_signals(self):
'''enum signals passed to dut_convertible_top should raise
Whilst enum signals are not supported for conversion, they should
raise a proper ValueError.
'''
simulated_input_cycles = 20
args = self.default_args.copy()
enum_names = ('a', 'b', 'c', 'd', 'e')
enum_vals = enum(*enum_names)
args['output'] = Signal(enum_vals.a)
args['test_input'] = Signal(enum_vals.a)
test_obj = SynchronousTest(self.identity_factory,
self.identity_factory, args,
self.default_arg_types)
test_obj.cosimulate(simulated_input_cycles)
self.assertRaisesRegex(ValueError,
'enum signals are currently unsupported',
test_obj.dut_convertible_top, 'foobarfile')
def uart_tx(clk_i, rst_i, tx_tick_i, dat_i, start_i, ready_o, tx_o):
dat_r = createSignal(0, 8)
bit_cnt = createSignal(0, 3)
tx_state = hdl.enum('IDLE', 'START', 'DATA', 'STOP')
state = hdl.Signal(tx_state.IDLE)
@hdl.always_seq(clk_i.posedge, reset=rst_i)
def fsm_proc():
if state == tx_state.IDLE:
ready_o.next = True
if start_i:
dat_r.next = dat_i
state.next = tx_state.START
ready_o.next = False
else:
tx_o.next = True
elif state == tx_state.START:
if tx_tick_i:
tx_o.next = False
state.next = tx_state.DATA
elif state == tx_state.DATA:
if tx_tick_i:
tx_o.next = dat_r[0]
dat_r.next = hdl.concat(False, dat_r[8:1])
bit_cnt.next = bit_cnt + 1
if bit_cnt == 7:
state.next = tx_state.STOP
elif state == tx_state.STOP:
if tx_tick_i:
state.next = tx_state.IDLE
tx_o.next = True
ready_o.next = True
else:
state.next = tx_state.IDLE
return hdl.instances()
def adc128s022(glbl, fifobus, spibus, channel):
"""An interface to the ADC 128s022
Arguments:
glbl: global interface, clock, reset, enable, etc.
fifobus: FIFO interface
channel: channel to read
"""
assert isinstance(fifobus, FIFOBus)
assert isinstance(spibus, SPIBus)
# local references
clock, reset = glbl.clock, glbl.reset
# use the signals names in the datasheet, datashee names are
# from the device perspective, swapped here
sclk, dout, din, csn = spibus()
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# get a FIFO to put the samples in, each sample is 12 bits
# the upper 4 bits contain the channel that was sampled
assert len(fifobus.write_data) == 16
assert len(fifobus.read_data) == 16
sample = Signal(intbv(0)[12:])
fifo_inst = fifo_fast(glbl, fifobus, size=16)
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# generate the sclk frequency, the clock needs to
# be between 1MHz and 3.2MHz. To read all samples
# at the max rate 16*200e3 = 3.2MHz (200 kS/s)
# the clock directly controls the conversion process
max_frequency = 3.2e6
ndiv = int(ceil(clock.frequency / max_frequency))
sample_rate = (clock.frequency / ndiv) / 16
hightick = ndiv // 2
lowtick = ndiv - hightick
print("derived sample rate: {} ({}, {}) given a {} MHz clock".format(
sample_rate, hightick, lowtick, clock.frequency/1e6))
# depending on the system (global) clock frequency the sclk
# might not have 50% duty cycle (should be ok)
# the datasheet indicates it requires at least a 40% cycle
# for the high,
# @todo: add a check for duty cycle
clkcnt = Signal(intbv(hightick, min=0, max=ndiv))
sclkpos, sclkneg = [Signal(bool(0)) for _ in range(2)]
@always_seq(clock.posedge, reset=reset)
def beh_sclk_gen():
# default case
sclkneg.next = False
sclkpos.next = False
# when the count expires toggle the clock
if clkcnt == 1:
if sclk:
sclk.next = False
sclkneg.next = True
clkcnt.next = lowtick
else:
sclk.next = True
sclkpos.next = True
clkcnt.next = hightick
else:
clkcnt.next = clkcnt-1
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# state-machine to drive sample conversion
states = enum('start', 'capture')
state = Signal(states.start)
bitcnt = Signal(intbv(0, min=0, max=17))
# these could be combined into a single register (future optimization)
sregout = Signal(intbv(0)[16:]) # shift-out register
sregin = Signal(intbv(0)[16:]) # shift-in register
# the ADC will generate continuous samples, each sample retrieval
# is 16 bits. The following state-machine assumes there are a
# couple clock cycles between sclk pos/neg strobes. Should add
# a check
# @todo: check ndiv > 4 ( ?)
@always_seq(clock.posedge, reset=reset)
def beh_state_machine():
fifobus.write.next = False
if state == states.start:
# @todo: wait some amount of time
if sclkneg:
bitcnt.next = 0
state.next = states.capture
csn.next = False
sregout.next[14:11] = channel
elif state == states.capture:
if sclkpos:
bitcnt.next = bitcnt + 1
sregin.next = concat(sregin[15:0], din)
elif sclkneg:
sregout.next = concat(sregout[15:0], '0')
if bitcnt == 16:
state.next = states.start
sample.next = sregin[12:] # this can be removed
if not fifobus.full:
fifobus.write_data.next = sregin
fifobus.write.next = True
else:
print("FIFO full dropping sample")
# assign the serial out bit to the msb of the shift-register
assign(dout, sregout(15))
return myhdl.instances()
def process(self, glbl, serin, serout):
""" """
clock, reset = glbl.clock, glbl.reset
txq, rxq = self._txq, self._rxq
maxbaud = clock.frequency / self.baudrate
baudcnt = Signal(0)
baudce, baudceh = Signal(bool(0)), Signal(bool(0))
syncbaud = Signal(bool(0))
@always_seq(clock.posedge, reset=reset)
def mdlbaud():
# @todo: need separate tx and rx baud strobes, the rx
# syncs the count to the start of a byte frame
# can't share a counter if rx and tx are at the
# same time.
# this will not work if currently transmitting
if syncbaud:
baudcnt.next = 0
else:
if baudcnt > maxbaud:
baudcnt.next = 0
baudce.next = True
baudceh.next = False
elif baudcnt == maxbaud // 2:
baudcnt.next = baudcnt + 1
baudce.next = False
baudceh.next = True
else:
baudcnt.next = baudcnt + 1
baudce.next = False
baudceh.next = False
# tx and rx states
states = enum("wait", "start", "byte", "parity", "stop", "end")
txbyte = Signal(intbv(0)[8:])
txbitcnt = Signal(0)
txstate = Signal(states.wait)
@always_seq(clock.posedge, reset=reset)
def mdltx():
if txstate == states.wait:
serout.next = True
if not txq.empty():
txbyte.next = txq.get()
txbitcnt.next = 0
txstate.next = states.start
elif txstate == states.start:
if baudce:
serout.next = False
txstate.next = states.byte
elif txstate == states.byte:
if baudce:
serout.next = True if txbyte & 0x01 else False
txbitcnt.next = txbitcnt + 1
txbyte.next = txbyte >> 1
elif txbitcnt == 8:
txbitcnt.next = 0
txstate.next = states.stop
elif txstate == states.stop:
if baudce:
serout.next = True
txbitcnt.next = txbitcnt + 1
elif txbitcnt.next == self.stopbits:
txstate.next = states.end
elif txstate == states.end:
txstate.next = states.wait
rxbyte = Signal(intbv(0)[8:])
rxbitcnt = Signal(0)
rxstate = Signal(states.wait)
_serin = Signal(bool(1))
serin_posedge, serin_negedge = Signal(bool(0)), Signal(bool(0))
@always(clock.posedge)
def mdlrxd():
_serin.next = serin
@always_comb
def mdledges():
serin_posedge.next = False
serin_negedge.next = False
if not _serin and serin:
serin_posedge.next = True
elif _serin and not serin:
serin_negedge.next = True
@always_seq(clock.posedge, reset=reset)
def mdlrx():
syncbaud.next = False
if rxstate == states.wait:
if serin_negedge:
rxstate.next = states.start
syncbaud.next = True
elif rxstate == states.start:
if baudceh:
rxstate.next = states.byte
rxbitcnt.next = 0
elif rxstate == states.byte:
if baudceh:
rxbyte.next[rxbitcnt] = serin
rxbitcnt.next = rxbitcnt + 1
elif rxbitcnt == 8:
rxstate.next = states.stop
rxbitcnt.next = 0
elif rxstate == states.stop:
if baudceh:
assert serin
rxbitcnt.next = rxbitcnt + 1
elif rxbitcnt == self.stopbits:
rxstate.next = states.end
elif rxstate == states.end:
self._rxq.put(int(rxbyte))
rxstate.next = states.wait
return myhdl.instances()
def mem_test(glbl, memmap, progress, error, done,
start_address=0x00000000, end_address=0xFFFFFFFF):
"""
This module performs a memory test over the memory-map bus
"""
if end_address > memmap.addr.max:
end_address = memmap.addr.max
States = enum('init', 'write', 'write_ack', 'compare_read',
'compare', 'end')
state = Signal(States.init)
clock, reset = glbl.clock, glbl.reset
rglbl, randgen = random_generator.portmap.values()
randgen.data = Signal(memmap.wdata.val)
rglbl.clock, rglbl.reset = clock, reset
rand_inst = random_generator(glbl, randgen)
@always_seq(clock.posedge, reset=reset)
def beh():
# defaults
randgen.load.next = False
randgen.enable.next = False
if state == States.init:
randgen.load.next = True
randgen.enable.next = True
error.next = False
progress.next = 0
memmap.addr.next = start_address
elif state == States.write:
progress.next = 1
memmap.write.next = True
memmap.wdata.next = randgen.data
state.next = States.write.ack
randgen.enable.next = True
elif state == States.write_ack:
memmap.write.next = False
if memmap.addr == end_address-1:
randgen.load.next = True
state.next = States.compare_read
memmap.addr.next = start_address
else:
memmap.addr.next = memmap.addr + 1
state.next = States.write
elif state == States.compare_read:
progress.next = 2
memmap.read.next = True
elif state == States.compare:
memmap.read.next = False
randgen.enable.next = True
if memmap.rdata != randgen.data:
error.next = True
if memmap.addr == end_address-1:
state.next = States.end
else:
memmap.addr.next = memmap.addr + 1
state.next = States.compare.read
elif state == States.end:
pass
else:
assert False, "Invalid state %s" % (state,)
return myhdl.instances()
def exciter(
resetn,
system_clock,
pclk,
paddr,
psel,
penable,
pwrite,
pwdata,
pready,
prdata,
pslverr,
dac_clock,
dac_data):
####### FIFO ############
# Read
re = Signal(bool(False))
rclk = system_clock
Q = Signal(intbv(0)[32:])
# Write
we = Signal(bool(False))
wclk = pclk
data = Signal(intbv(0)[32:])
# Threshold
full = Signal(bool(False))
full.driven = 'wire'
afull = Signal(bool(False))
afull.driven = 'wire'
empty = Signal(bool(False))
empty.driven = 'wire'
aempty = Signal(bool(False))
aempty.driven = 'wire'
fifo_args = resetn, re, rclk, Q, we, wclk, data, full, afull, \
empty, aempty
fifo = FIFO(*fifo_args,
width=32,
depth=1024)
######### RESAMPLER ###########
######### INTERLEAVER #########
in_phase = Signal(bool(0))
sample_i = Signal(intbv(0, 0, 2**10))
sample_q = Signal(intbv(0, 0, 2**10))
########## STATE MACHINE ######
state_t = enum('IDLE', 'WRITE_SAMPLE', 'DONE',)
state = Signal(state_t.IDLE)
############ TX EN ###########
txen = Signal(bool(0))
@always_seq(pclk.posedge, reset=resetn)
def state_machine():
if state == state_t.IDLE:
if penable and psel and pwrite:
if paddr[8:] == 0x00:
state.next = state_t.WRITE_SAMPLE
pready.next = 0
we.next = 1
data.next = pwdata
if full:
raise OverrunError
elif paddr[8:] == 0x01:
print 'hi', pwdata
txen.next = pwdata[0]
elif psel and not pwrite:
pass
elif state == state_t.WRITE_SAMPLE:
we.next = 0
state.next = state_t.DONE
elif state == state_t.DONE:
pready.next = 1
state.next = state_t.IDLE
@always(system_clock.posedge)
def resampler():
if txen: # Update the sample out of phase, locking
if re:
sample_i.next = Q[9:]
sample_q.next = Q[32:23]
re.next = not re
@always(system_clock.posedge)
def interleaver():
if txen:
dac_data.next = sample_i[10:2] if in_phase else sample_q[10:2]
dac_clock.next = not in_phase
in_phase.next = not in_phase
return fifo, state_machine, resampler, interleaver
self.outp = Signal(bool(0))
self.inp = Signal(bool(0))
self.br_op = Signal(bool(0))
self.jal = Signal(bool(0))
self.loadh = Signal(bool(0))
self.indls = Signal(bool(0))
self.signals = [self.al_ena, self.ah_ena, self.log_add, self.add_sub, self.shr, self.sel_imm, self.store, \
self.outp, self.inp, self.br_op, self.jal, self.loadh, self.indls]
class inpSignal():
def __init__(self):
self.rd_data = Signal(intbv(0)[16:])
class outpSignal():
def __init__(self):
self.wr_data = Signal(intbv(0)[16:])
self.wr_strobe = Signal(bool(0))
self.rd_strobe = Signal(bool(0))
self.io_addr = Signal(intbv(0)[16:])
dec_op_type = enum('al_ena', 'ah_ena', 'log_add', 'add_sub',
'shr', 'sel_imm', 'store', 'outp', 'inp', 'br_op', 'jal',
'loadh', 'indls')
alu_op_type = enum('NOP', 'LD', 'AND', 'OR', 'XOR')
IM_BITS = 9
DM_BITS = 8
def lt24lcd(glbl, vmem, lcd):
""" A video display driver for the terasic LT24 LCD display.
This driver reads pixels from the VideoMemory interface and transfers
them to the LT24 display. This hardware module (component) will also
perform the initial display configuration.
Ports:
glbl (Global): global signals, clock, reset, enable, etc.
vmem (VideoMemory): video memory interface, the driver will read
pixels from this interface.
lcd (LT24Interface): The external LT24 interface.
Parameters:
None
RGB 5-6-5 (8080-system 16bit parallel bus)
"""
assert isinstance(lcd, LT24Interface)
resolution, refresh_rate = (240, 320), 60
number_of_pixels = resolution[0] * resolution[1]
# local references to signals in interfaces
clock, reset = glbl.clock, glbl.reset
# make sure the user timer is configured
assert glbl.tick_user is not None
# write out a new VMEM to the LCD display, a write cycle
# consists of putting the video data on the bus and latching
# with the `wrx` signal. Init (write once) the column and
# page addresses (cmd = 2A, 2B) then write mem (2C)
states = enum(
'init_wait_reset', # wait for the controller to reset the LCD
'init_start', # start the display init sequence
'init_start_cmd', # send a command, port of the display seq
'init_next', # determine if another command
'write_cmd_start', # command subroutine
'write_cmd', # command subroutine
'display_update_start', # update the display
'display_update_start_p', # delay for command ack
'display_update', # update the display
'display_update_next', # wait for driver to ack pixel xfered
'display_update_end' # end of display update
)
state = Signal(states.init_wait_reset)
state_prev = Signal(states.init_wait_reset)
cmd = Signal(intbv(0)[8:])
return_state = Signal(states.init_wait_reset)
num_hor_pxl, num_ver_pxl = resolution
print("resolution {}x{} = {} number of pixes".format(
num_hor_pxl, num_ver_pxl, number_of_pixels))
hcnt = intbv(0, min=0, max=num_hor_pxl)
vcnt = intbv(0, min=0, max=num_ver_pxl)
# signals to start a new command transaction to the LCD
datalen = Signal(intbv(0, min=0, max=number_of_pixels+1))
data = Signal(intbv(0)[16:])
datasent = Signal(bool(0))
datalast = Signal(bool(0))
cmd_in_progress = Signal(bool(0))
# --------------------------------------------------------
# LCD driver
gdrv = lt24lcd_driver(glbl, lcd, cmd, datalen, data,
datasent, datalast, cmd_in_progress)
# --------------------------------------------------------
# build the display init sequency ROM
rom, romlen, maxpause = build_init_rom(init_sequence)
offset = Signal(intbv(0, min=0, max=romlen+1))
pause = Signal(intbv(0, min=0, max=maxpause+1))
# --------------------------------------------------------
# state-machine
@always_seq(clock.posedge, reset=reset)
def rtl_state_machine():
state_prev.next = state
if state == states.init_wait_reset:
if lcd.reset_complete:
state.next = states.init_start
elif state == states.init_start:
v = rom[offset]
# @todo: change the table to only contain the number of
# @todo: bytes to be transferred
datalen.next = v - 3
p = rom[offset+1]
pause.next = p
offset.next = offset + 2
state.next = states.init_start_cmd
elif state == states.init_start_cmd:
v = rom[offset]
cmd.next = v
if datalen > 0:
v = rom[offset+1]
data.next = v
offset.next = offset + 2
else:
offset.next = offset + 1
state.next = states.write_cmd_start
return_state.next = states.init_next
elif state == states.init_next:
if pause == 0:
if offset == romlen:
state.next = states.display_update_start
else:
state.next = states.init_start
elif glbl.tick_ms:
pause.next = pause - 1
elif state == states.write_cmd_start:
state.next = states.write_cmd
elif state == states.write_cmd:
if cmd_in_progress:
if datasent and not datalast:
v = rom[offset]
data.next = v
offset.next = offset+1
else:
cmd.next = 0
state.next = return_state
elif state == states.display_update_start:
if glbl.tick_user:
cmd.next = 0x2C
state.next = states.display_update_start_p
datalen.next = number_of_pixels
elif state == states.display_update_start_p:
state.next =states.display_update
elif state == states.display_update:
assert cmd_in_progress
if vcnt == num_ver_pxl-1:
hcnt[:] = 0
vcnt[:] = 0
elif hcnt == num_hor_pxl-1:
hcnt[:] = 0
vcnt[:] = vcnt + 1
else:
hcnt[:] = hcnt + 1
# this will be the pixel for the next write cycle
vmem.hpxl.next = hcnt
vmem.vpxl.next = vcnt
# this is the pixel for the current write cycle
if hcnt == 0 and vcnt == 0:
cmd.next = 0
state.next = states.display_update_end
else:
data.next = concat(vmem.red, vmem.green, vmem.blue)
state.next = states.display_update_next
elif state == states.display_update_next:
if cmd_in_progress:
if datasent and not datalast:
state.next = states.display_update
else:
cmd.next = 0
state.next = states.display_update_end
elif state == states.display_update_end:
# wait till the driver ack the command completion
if not cmd_in_progress:
state.next = states.display_update_start
return gdrv, rtl_state_machine
def command_bridge(glbl, fifobus, mmbus):
""" Convert a command packet to a memory-mapped bus transaction
This module will decode the incomming packet and start a bus
transaction, the memmap_controller_basic is used to generate
the bus transactions, it convertes the Barebone interface to
the MemoryMapped interface being used.
The variable length command packet is:
00: 0xDE
01: command byte (response msb indicates error)
02: address high byte
03: address byte
04: address byte
05: address low byte
06: length of data (max length 256 bytes)
07: 0xCA # sequence number, fixed for now
08: data high byte
09: data byte
10: data byte
11: data low byte
Fixed 12 byte packet currently supported, future
to support block write/reads up to 256-8-4
12 - 253: write / read (big-endian)
@todo: last 2 bytes crc
The total packet length is 16 + data_length
Ports:
glbl: global signals and control
fifobus: FIFOBus interface, read and write path
mmbus: memory-mapped bus (interface)
this module is convertible
"""
assert isinstance(fifobus, FIFOBus)
assert isinstance(mmbus, MemoryMapped)
clock, reset = glbl.clock, glbl.reset
bb = Barebone(glbl, data_width=mmbus.data_width,
address_width=mmbus.address_width)
states = enum(
'idle',
'wait_for_packet', # receive a command packet
'check_packet', # basic command check
'write', # bus write
'write_end', # end of the write cycle
'read', # read bus cycles for response
'read_end', # end of the read cycle
'response', # send response packet
'response_full', # check of RX FIFO full
'error', # error occurred
'end' # end state
)
state = Signal(states.idle)
ready = Signal(bool(0))
error = Signal(bool(0))
bytecnt = intbv(0, min=0, max=256)
# known knows
pidx = (0, 7,)
pval = (0xDE, 0xCA,)
assert len(pidx) == len(pval)
nknown = len(pidx)
bytemon = Signal(intbv(0)[8:])
# only supporting 12byte packets (single read/write) for now
packet_length = 12
data_offset = 8
packet = [Signal(intbv(0)[8:]) for _ in range(packet_length)]
command = packet[1]
address = ConcatSignal(*packet[2:6])
data = ConcatSignal(*packet[8:12])
datalen = packet[6]
# convert generic memory-mapped bus to the memory-mapped interface
# passed to the controller
mmc_inst = controller_basic(bb, mmbus)
@always_comb
def beh_fifo_read():
if ready and not fifobus.empty:
fifobus.read.next = True
else:
fifobus.read.next = False
@always_seq(clock.posedge, reset=reset)
def beh_state_machine():
if state == states.idle:
state.next = states.wait_for_packet
ready.next = True
bytecnt[:] = 0
elif state == states.wait_for_packet:
if fifobus.read_valid:
# check the known bytes, if the values is unexpected
# goto the error state and flush all received bytes.
for ii in range(nknown):
idx = pidx[ii]
val = pval[ii]
if bytecnt == idx:
if fifobus.read_data != val:
error.next = True
state.next = states.error
packet[bytecnt].next = fifobus.read_data
bytecnt[:] = bytecnt + 1
# @todo: replace 20 with len(CommandPacket().header)
if bytecnt == packet_length:
ready.next = False
state.next = states.check_packet
elif state == states.check_packet:
# @todo: some packet checking
# @todo: need to support different address widths, use
# @todo: `bb` attributes to determine which bits to assign
bb.per_addr.next = address[32:28]
bb.mem_addr.next = address[28:0]
assert bb.done
bytecnt[:] = 0
if command == 1:
state.next = states.read
elif command == 2:
bb.write_data.next = data
state.next = states.write
else:
error.next = True
state.next = states.error
elif state == states.write:
# @todo: add timeout
if bb.done:
bb.write.next = True
state.next = states.write_end
elif state == states.write_end:
bb.write.next = False
if bb.done:
state.next = states.read
elif state == states.read:
# @todo: add timeout
if bb.done:
bb.read.next = True
state.next = states.read_end
elif state == states.read_end:
bb.read.next = False
if bb.done:
# @todo: support different data_width bus
packet[data_offset+0].next = bb.read_data[32:24]
packet[data_offset+1].next = bb.read_data[24:16]
packet[data_offset+2].next = bb.read_data[16:8]
packet[data_offset+3].next = bb.read_data[8:0]
state.next = states.response
elif state == states.response:
fifobus.write.next = False
if bytecnt < packet_length:
if not fifobus.full:
fifobus.write.next = True
fifobus.write_data.next = packet[bytecnt]
bytecnt[:] = bytecnt + 1
state.next = states.response_full
else:
state.next = states.end
elif state == states.response_full:
fifobus.write.next = False
state.next = states.response
elif state == states.error:
if not fifobus.read_valid:
state.next = states.end
ready.next = False
elif state == states.end:
error.next = False
ready.next = False
state.next = states.idle
else:
assert False, "Invalid state %s" % (state,)
bytemon.next = bytecnt
return beh_fifo_read, mmc_inst, beh_state_machine
from myhdl import block, always_seq, always_comb, Signal, intbv, enum, \
ResetSignal
from gemac.crc32 import crc32
txstate = enum('IDLE', 'PREAMBLE', 'SFD', 'FIRSTBYTE', 'INFRAME', 'PADDING',
'ERROR', 'CRC1', 'CRC2', 'CRC3', 'CRC4', 'SENDPAUSE')
@block
def txengine(txclientintf, txgmii_intf, txflowintf, txconfig, sysreset):
"""Transmit Engine.
Accepts Ethernet frame data from the Client Transmitter interface,
adds preamble to the start of the frame, add padding bytes and frame
check sequence. It ensures that the inter-frame spacing between successive
frames is at least the minimum specified. The frame is then converted
into a format that is compatible with the GMII and sent to the GMII Block.
Args:
txclientintf (TxClientFIFO) - transmit streaming data interface from transmit FIFO.
txgmii_intf (TxGMII_Interface) - transmit streaming data interface to GMII.
flow_intf (TxFlowInterface) - transmit flow control interface.
txconfig (Signal/intbv)(32 bit) - configregisters - Transmitter configuration word.
See Xilinx_UG144 pdf, Table 8.5, Pg-80 for detailed description.
reset - System reset
"""
state = Signal(txstate.IDLE)
curbyte = Signal(intbv(1, min=0, max=10000))
pausereq = Signal(bool(0))
reset = ResetSignal(0, active=0, async=True)
OPG_ADD = 0b00 # 0b00ixxx add, sub, cmp
OPG_CMP = 0b000101 # 0b000101 cmp
OPG_MUL = 0b01000 # 0b01i000 integer multiply
OPG_BSF = 0b01001 # 0b01i001 barrel shift
OPG_DIV = 0b01010 # 0b010010 integer divide
OPG_FSL = 0b01011 # 0b01d011 fsl command
OPG_FLT = 0b01110 # 0b010110 float
OPG_LOG = 0b100 # 0b10i0xx logic and pattern compare
OPG_IMM = 0b101100 # 0b101100 imm
OPG_EXT = 0b100100 # 0b100100 shift right, sext, cache
OPG_SPR = 0b100101 # 0b100101 move from/to special register
OPG_RET = 0b101101 # 0b101101 return
OPG_BRU = 0b10110 # 0b10i110 unconditional branch
OPG_BCC = 0b10111 # 0b10i111 conditional branch
OPG_MEM = 0b11 # 0b11ixxx load, store
alu_operation = enum('ALU_ADD', 'ALU_OR', 'ALU_AND', 'ALU_XOR',
'ALU_SHIFT', 'ALU_SEXT8', 'ALU_SEXT16', #)
'ALU_MUL', 'ALU_BS')
src_type_a = enum('REGA', 'NOT_REGA', 'PC', 'REGA_ZERO')
src_type_b = enum('REGB', 'NOT_REGB', 'IMM', 'NOT_IMM')
carry_type = enum('C_ZERO', 'C_ONE', 'ALU', 'ARITH')
branch_condition = enum('BEQ', 'BNE', 'BLT', 'BLE', 'BGT', 'BGE',
'BRU', 'NOP')
transfer_size_type = enum('WORD', 'HALFWORD', 'BYTE')
### EOF ###
# vim:smarttab:sts=4:ts=4:sw=4:et:ai:tw=80:
def controller_basic(generic, memmap):
"""
(arguments == ports)
Arguments:
generic: barebone interface
memmap: any memory-map interface
This module contains a basic memory map controller, the
barebone bus can be used to start a bus transaction to
any of the other implemented memory-mapped buses.
"""
assert isinstance(generic, Barebone)
assert isinstance(memmap, MemoryMapped)
states = enum('idle', 'wait', 'write', 'writeack', 'read',
'readdone', 'done', 'end')
state = Signal(states.idle)
timeout_max = 33
tocnt = Signal(intbv(0, min=0, max=timeout_max))
# map the generic bus to the bus in use
conv_inst = memmap.map_from_generic(generic)
@always_seq(memmap.clock.posedge, reset=memmap.reset)
def beh_sm():
# ~~~[Idle]~~~
if state == states.idle:
if not generic.done:
state.next = states.wait
elif generic.write:
state.next = states.write
elif generic.read:
state.next = states.read
# ~~~[Wait]~~~
elif state == states.wait:
if generic.done:
tocnt.next = 0
if generic.write:
state.next = states.done
elif generic.read:
state.next = states.readdone
# ~~~[Write]~~~
elif state == states.write:
state.next = states.done
tocnt.next = 0
# ~~~[Read]~~~
elif state == states.read:
state.next = states.readdone
# ~~~~[ReadDone]~~~
elif state == states.readdone:
if generic.done:
state.next = states.done
# ~~~[Done]~~~
elif state == states.done:
# wait for transaction signals to be release
if not (generic.write or generic.read):
state.next = states.idle
# ~~~[]~~~
else:
assert False, "Invalid state %s" % (state,)
return conv_inst, beh_sm
def fifo(
resetn,
re,
rclk,
Q,
we,
wclk,
data,
full,
afull,
empty,
aempty,
afval,
aeval,
wack,
dvld,
overflow,
underflow,
rdcnt,
wrcnt,
**kwargs
):
"""Main Fifo object.
This only works as a simulation; when it is transpiled into Verilog,
an auto-generated IP Core is used instead. To see how to build the
the IP core yourself with Libero IDE, check out this video (TODO).
"""
width = kwargs["width"]
depth = kwargs["depth"]
write_active = kwargs.get("write_active", active_high)
write_edge = kwargs.get("write_edge", posedge)
read_active = kwargs.get("read_active", active_high)
read_edge = kwargs.get("read_edge", posedge)
reset_active = kwargs.get("reset_active", active_low)
reset_edge = kwargs.get("reset_edge", negedge)
threshold = kwargs.get("threshold", None)
max_threshold = kwargs.get("max_threshold", None)
state_t = enum("IDLE", "ACCESS")
rstate = Signal(state_t.IDLE)
verbose = kwargs.get("verbose", False)
_fifo = kwargs.get("load", [])
Q_pipe1 = Signal(intbv(0)[len(Q) :])
dvld_pipe1 = Signal(bool(0))
Q_pipe2 = Signal(intbv(0)[len(Q) :])
dvld_pipe2 = Signal(bool(0))
@always_seq(write_edge(wclk), reset=resetn)
def write():
afull.next = len(_fifo) >= afval
full.next = len(_fifo) >= depth
if write_active(we):
if len(_fifo) >= depth:
if verbose:
print "overflow"
overflow.next = True
wack.next = False
else:
if verbose:
print "adding %d" % int(data)
_fifo.insert(0, int(data))
overflow.next = False
wack.next = True
wrcnt.next = wrcnt - 1
rdcnt.next = rdcnt + 1
else:
overflow.next = False
wack.next = False
@always_seq(read_edge(rclk), reset=resetn)
def read():
aempty.next = len(_fifo) <= aeval
empty.next = len(_fifo) == 0
if read_active(re):
if len(_fifo) == 0:
if verbose:
print "underflow"
underflow.next = True
dvld_pipe1.next = False
else:
if verbose:
print "removing %d" % _fifo[-1]
Q_pipe1.next = _fifo.pop()
dvld_pipe1.next = True
underflow.next = False
wrcnt.next = wrcnt + 1
rdcnt.next = rdcnt - 1
else:
underflow.next = False
dvld_pipe1.next = False
if dvld_pipe1:
Q_pipe2.next = Q_pipe1
dvld_pipe2.next = True
else:
dvld_pipe2.next = False
if dvld_pipe2:
Q.next = Q_pipe2
dvld.next = True
else:
dvld.next = False
return instances()
def uartrx(glbl, fbusrx, rx, baudce16):
""" """
clock, reset = glbl.clock, glbl.reset
states = enum('wait', 'byte', 'stop', 'end')
state = Signal(states.wait)
rxbyte = Signal(intbv(0)[8:])
bitcnt = Signal(intbv(0, min=0, max=9))
# signals use do find the mid bit
rxd = Signal(bool(0))
mcnt = Signal(modbv(0, min=0, max=16))
midbit = Signal(bool(0))
rxinprog = Signal(bool(0))
# get the middle of the bits, always sync to the beginning
# (negedge) of the start bit
@always(clock.posedge)
def rtlmid():
rxd.next = rx
if (rxd and not rx) and state == states.wait:
mcnt.next = 0
rxinprog.next = True
elif rxinprog and state == states.end:
rxinprog.next = False
elif baudce16:
mcnt.next = mcnt + 1
# 7 or 8 doesn't really matter
if rxinprog and mcnt == 7 and baudce16:
midbit.next = True
else:
midbit.next = False
@always_seq(clock.posedge, reset=reset)
def rtlrx():
# defaults
fbusrx.wr.next = False
# state handlers
if state == states.wait:
if midbit and not rx:
state.next = states.byte
elif state == states.byte:
if midbit:
rxbyte.next[bitcnt] = rx
bitcnt.next = bitcnt + 1
elif bitcnt == 8:
state.next = states.stop
bitcnt.next = 0
elif state == states.stop:
if midbit:
#assert rx
state.next = states.end
fbusrx.wr.next = True
fbusrx.wdata.next = rxbyte
elif state == states.end:
state.next = states.wait
bitcnt.next = 0
return rtlmid, rtlrx
def get_utilization(fn=None):
""" parse the device resource utilization from the logs
@todo : the following is fairly ugly and not the most
reliable. There are xml files create (xrp) that would
be a better source for the utilization - once the xlm
package is understood these reports can be used instead
of the log.
"""
log = open(fn, 'r')
info = {}
info['syn'] = {}
fmax = []
States = enum('search', 'slc_util', 'io_util', 'ip_util')
state = States.search
for ln in log:
if ln.find('Maximum Frequency:') != -1:
if len(ln.split(':')) < 3:
continue
fstr = ln.split(':')[2]
fstr = fstr.replace(')', '')
fstr = fstr.replace(' ', '')
fstr = fstr.strip()
fmax.append(fstr)
# @todo: probalby better to parse the XML files!
# synthesis gives results in a table
# Slice Logic Utilization:
# IO Utilization:
# Specific Feature Utilization:
# <name>: X out of Y <percent>
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
if state == States.search:
if ln.find('Slice Logic Utilization') != -1:
state = States.slc_util
lncnt = 1
#print(ln)
elif ln.find('Specific Feature Utilization') != -1:
state = States.ip_util
lncnt = 1
#print(ln)
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
elif state == States.slc_util:
ln = ln.strip()
if lncnt in (1,7):
# check sliptls
print(ln)
sp1 = ln.split(':')
sp2 = sp1[1].split()
if len(sp1) != 2 or len(sp2) != 5:
state = States.search
continue # jump to the next line
#print(lncnt, ln)
nm,outof = ln.split(':')
x,out,of,y,p = outof.split()
#print(x,out,of,y,p)
x = x.replace(',', '')
y = y.replace(',', '')
p = p.replace('%', '')
if lncnt == 1:
info['syn']['reg'] = tuple(map(int, (x,y,p,)))
elif lncnt == 7:
info['syn']['lut'] = tuple(map(int, (x,y,p,)))
elif lncnt >= 10:
state = States.search
lncnt += 1
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
elif state == States.ip_util:
ln = ln.strip()
if lncnt in (1,2,16):
#print(ln)
# check sliptls
sp1 = ln.split(':')
if len(sp1) != 2:
state = States.search
continue
sp2 = sp1[1].split()
if len(sp2) != 5:
state = States.search
continue # jump to the next line
#print(lncnt, ln)
nm,outof = ln.split(':')
x,out,of,y,p = outof.split()
#print(x,out,of,y,p)
x = x.replace(',', '')
y = y.replace(',', '')
p = p.replace('%', '')
if lncnt == 1: # RAMB16B
pass
elif lncnt == 2: # RAMB8B
pass
elif lncnt == 16: # DSP48
#print(x,out,of,y,p)
info['syn']['dsp'] = tuple(map(int, (x,y,p,)))
elif lncnt >= 22:
state = States.search
lncnt += 1
# end of parsing state-machine
if len(fmax) > 0:
info['fmax'] = fmax[-1]
else:
info['fmax'] = -1
return info
def __init__(self, num_banks=4, addr_width=12, data_width=16, ver='sdr'):
# signals in the interface
self.frequency = 0. # @todo:
self.clk = Signal(bool(0)) # interface clock
self.cke = Signal(bool(0)) # clock enable
self.cs = Signal(bool(0)) # chip select
self.cas = Signal(bool(0)) # column address strobe
self.ras = Signal(bool(0)) # row address strobe
self.we = Signal(bool(0)) # write strobe
self.bs = Signal(intbv(0)[2:]) # bank select
self.addr = Signal(intbv(0)[addr_width:])
self.dqm = Signal(bool(0))
self.dqml = Signal(bool(0))
self.dqmh = Signal(bool(0))
self.dq = TristateSignal(intbv(0)[data_width:])
# the controller and SDRAM bi-dir bus drivers
self.dqo = self.dq.driver()
self.dqi = self.dq.driver()
# the following separate write and read buses are
# not used in an actual device. They are used by
# the model for debug and testing.
self.wdq = Signal(intbv(0)[data_width:])
self.rdq = Signal(intbv(0)[data_width:])
# configurations for the SDRAM interfacing with
self.num_banks = num_banks
self.addr_width = addr_width
self.data_width = data_width
self.ver = ver
# saved read, transactors save the read data here
self.read_data = None
# generic commands for a DRAM, override these for specific (S)DRAM devices
# @todo: attribute of the interface or global definition?
self.Commands = enum(
"NOP", # no operation, ignore all inputs
"ACT", # activate a row in a particular bank
"RD", # read, initiate a read burst to an active row
"WR", # write, initial a write burst to an active row
"PRE", # precharge, close a row in a particular bank
"REF", # refresh, start a refresh operation
# extended commands (???)
"LMR", # load mode register
)
# extract the default timing parameters, all parameters in ns
# but convert to "ps" like ticks.
cycles = {}
for k, v in self.timing.items():
cycles[k] = (v * (self.clock_frequency / 1e9))
# @todo: if 'ddr' in self.ver: cycles[k] *= 2
# add the cycle numbers to the
for k, v in cycles.items():
# majority of the timing parameters are maximum times,
# floor error on the side of margin ...
self.__dict__['cyc_'+k] = int(floor(v))
# convert the time parameters to simulation ticks
# @todo: where to get the global simulation step?
for k, v in self.timing.items():
self.__dict__['tick_'+k] = int(ceil(v * 1000))
def adc128s022_model(spibus, analog_channels, vref_pos=3.3, vref_neg=0.):
"""
This is a model of the ADC128S022 A/D converter. It will emulated
the behavior described in the datasheet.
"""
assert isinstance(analog_channels, list) and len(analog_channels) == 8
# use the signals names in the datasheet, names from the device
# perspective
sclk, dout, din, csn = spibus()
states = enum('start', 'track', 'hold')
state = Signal(states.start)
monbits = Signal(intbv(0)[16:])
monsmpl = Signal(intbv(0)[16:])
monbcnt = Signal(intbv(0)[16:])
@instance
def beh():
sample = intbv(0xAA)[16:]
bitcnt, bitsin = 0, intbv(0)[16:]
nextch = 0
dout.next = 0
while True:
if state == states.start:
yield delay(10)
if not csn:
state.next = states.track
bitcnt = 15
dout.next = 0
monbcnt.next = bitcnt
elif state == states.track:
yield sclk.posedge
bitsin[bitcnt] = int(din)
bitcnt -= 1
monbcnt.next = bitcnt
# @todo: determine a reasonable model of the track/capture
levels = [float(val) for val in analog_channels]
yield sclk.negedge
if bitcnt == 12:
ch = nextch
state.next = states.hold
# the real converter converts the sample over the next
# 12 clock cycles, convert instantly (is fine)
sample = convert(levels[ch], (vref_neg, vref_pos))
monsmpl.next = sample
print("converted channel {} from {} to {:04X}".format(
int(ch), float(levels[ch]), int(sample)))
elif state == states.hold:
yield sclk.posedge
bitsin[bitcnt] = int(din)
bitcnt -= 1
if bitcnt == 10:
nextch = bitsin[14:11]
# print(" captured next channel {} ({:04X})".format(nextch, int(bitsin)))
monbcnt.next = bitcnt
yield sclk.negedge
dout.next = sample[bitcnt]
# print("{:8d}: sample[{:2d}] = {:4d}, {}->{}".format(
# now(), bitcnt, int(sample), int(dout.val), int(dout.next)))
if bitcnt == 0:
state.next = states.start
yield sclk.posedge # let the last bit clock in
# need signals to update before next pass through
yield delay(1)
@always(sclk.posedge)
def mon():
monbits.next = concat(monbits[15:0], din)
return instances()
FIFO_DEPTH=1024,
CLK_BUS=50_000_000,
BAUD_RATE=115200):
tx_start = createSignal(0, 1) # entrada tx_start_i del UART
tx_ready = createSignal(0, 1) # salida tx_ready_o del UART
rx_ready = createSignal(0, 1) # salida rx_ready_o del UART
rx_dat = createSignal(
0, 8) # salida rx_dat_o del UART y entrada dat_i del FIFO
dequeue = createSignal(0, 1) # entrada dequeue_i del FIFO
empty = createSignal(0, 1) #salida empty_o del FIFO
full = createSignal(0, 1) # salida full_o del FIFO
dat = createSignal(0, 8) # entrada dat_i del tx y salida dat_o del FIFO
value = createSignal(
0, 11) # salida count_o del FIFO y entrada value_i del Driver7Seg
l_state = hdl.enum(
'RX', 'TX') #Declaracion para dos estados, recibiendo y enviando.
state = hdl.Signal(l_state.RX)
uart = UART(clk_i=clk_i,
rst_i=rst_i,
tx_dat_i=dat,
tx_start_i=tx_start,
tx_ready_o=tx_ready,
tx_o=tx_o,
rx_dat_o=rx_dat,
rx_ready_o=rx_ready,
rx_i=rx_i,
CLK_BUS=CLK_BUS,
BAUD_RATE=BAUD_RATE)
fifo = FIFO(clk_i=clk_i,
def ICache(clk_i,
rst_i,
cpu,
mem,
invalidate,
ENABLE=True,
D_WIDTH=32,
BLOCK_WIDTH=5,
SET_WIDTH=9,
WAYS=2,
LIMIT_WIDTH=32):
"""
The Instruction Cache module.
:param clk: System clock
:param rst: System reset
:param cpu: CPU slave interface (Wishbone Interconnect to master port)
:param mem: Memory master interface (Wishbone Interconnect to slave port)
:param invalidate: Enable flush cache
:param D_WIDTH: Data width
:param BLOCK_WIDTH: Address width for byte access inside a block line
:param SET_WIDTH: Address width for line access inside a block
:param WAYS: Number of ways for associative cache (Minimum: 2)
:param LIMIT_WIDTH: Maximum width for address
"""
if ENABLE:
assert D_WIDTH == 32, "Error: Unsupported D_WIDTH. Supported values: {32}"
assert BLOCK_WIDTH > 0, "Error: BLOCK_WIDTH must be a value > 0"
assert SET_WIDTH > 0, "Error: SET_WIDTH must be a value > 0"
assert not (WAYS & (WAYS - 1)), "Error: WAYS must be a power of 2"
# --------------------------------------------------------------------------
WAY_WIDTH = BLOCK_WIDTH + SET_WIDTH # cache mem_wbm address width
TAG_WIDTH = LIMIT_WIDTH - WAY_WIDTH # tag size
TAGMEM_WAY_WIDTH = TAG_WIDTH + 1 # Add the valid bit
TAGMEM_WAY_VALID = TAGMEM_WAY_WIDTH - 1 # Valid bit index
TAG_LRU_WIDTH = (WAYS * (WAYS - 1)) >> 1 # (N*(N-1))/2
# --------------------------------------------------------------------------
ic_states = enum('IDLE',
'READ',
'FETCH',
'FLUSH',
'FLUSH_LAST')
cpu_wbs = WishboneSlave(cpu)
mem_wbm = WishboneMaster(mem)
cpu_busy = Signal(False)
cpu_err = Signal(False)
cpu_wait = Signal(False)
mem_read = Signal(False)
mem_write = Signal(False)
mem_rmw = Signal(False)
tag_rw_port = [RAMIOPort(A_WIDTH=SET_WIDTH, D_WIDTH=TAGMEM_WAY_WIDTH) for i in range(WAYS)]
tag_flush_port = [RAMIOPort(A_WIDTH=SET_WIDTH, D_WIDTH=TAGMEM_WAY_WIDTH) for i in range(WAYS)]
tag_lru_rw_port = RAMIOPort(A_WIDTH=SET_WIDTH, D_WIDTH=TAG_LRU_WIDTH)
tag_lru_flush_port = RAMIOPort(A_WIDTH=SET_WIDTH, D_WIDTH=TAG_LRU_WIDTH)
cache_read_port = [RAMIOPort(A_WIDTH=WAY_WIDTH - 2, D_WIDTH=D_WIDTH) for _ in range(0, WAYS)]
cache_update_port = [RAMIOPort(A_WIDTH=WAY_WIDTH - 2, D_WIDTH=D_WIDTH) for _ in range(0, WAYS)]
data_cache = [cache_read_port[i].data_o for i in range(0, WAYS)]
state = Signal(ic_states.IDLE)
n_state = Signal(ic_states.IDLE)
busy = Signal(False)
miss = Signal(False)
miss_w = Signal(modbv(0)[WAYS:])
miss_w_and = Signal(False)
final_fetch = Signal(False)
final_flush = Signal(False)
lru_select = Signal(modbv(0)[WAYS:])
current_lru = Signal(modbv(0)[TAG_LRU_WIDTH:])
update_lru = Signal(modbv(0)[TAG_LRU_WIDTH:])
access_lru = Signal(modbv(0)[WAYS:])
lru_pre = Signal(modbv(0)[WAYS:])
tag_in = [Signal(modbv(0)[TAGMEM_WAY_WIDTH:]) for _ in range(0, WAYS)]
tag_out = [Signal(modbv(0)[TAGMEM_WAY_WIDTH:]) for _ in range(0, WAYS)]
lru_in = Signal(modbv(0)[TAG_LRU_WIDTH:])
lru_out = Signal(modbv(0)[TAG_LRU_WIDTH:])
tag_we = Signal(False)
refill_addr = Signal(modbv(0)[LIMIT_WIDTH - 2:])
refill_valid = Signal(False)
n_refill_addr = Signal(modbv(0)[LIMIT_WIDTH - 2:])
n_refill_valid = Signal(False)
flush_addr = Signal(modbv(0)[SET_WIDTH:])
flush_we = Signal(False)
n_flush_addr = Signal(modbv(0)[SET_WIDTH:])
n_flush_we = Signal(False)
@always_comb
def assignments():
final_fetch.next = (refill_addr[BLOCK_WIDTH - 2:] == modbv(-1)[BLOCK_WIDTH - 2:]) and mem_wbm.ack_i and mem_wbm.stb_o and mem_wbm.cyc_o
lru_select.next = lru_pre
current_lru.next = lru_out
access_lru.next = ~miss_w
busy.next = state != ic_states.IDLE
final_flush.next = flush_addr == 0
@always_comb
def miss_check():
"""
For each way, check tag and valid flag, and reduce the vector using AND.
If the vector is full of ones, the data is not in the cache: assert the miss flag.
MISS: data not in cache and the memory operation is a valid read. Ignore this if
the module is flushing data.
"""
value = modbv(0)[WAYS:]
for i in range(0, WAYS):
value[i] = (not tag_out[i][TAGMEM_WAY_VALID] or tag_out[i][TAG_WIDTH:0] != cpu_wbs.addr_i[LIMIT_WIDTH:WAY_WIDTH])
miss_w.next = value
@always_comb
def miss_check_2():
"""
Vector reduce: check for full miss.
"""
value = True
for i in range(0, WAYS):
value = value and miss_w[i]
miss_w_and.next = value
@always_comb
def miss_check_3():
"""
Check for valid wishbone cycle, and full miss.
"""
valid_read = cpu_wbs.cyc_i and cpu_wbs.stb_i and not cpu_wbs.we_i
miss.next = miss_w_and and valid_read and not invalidate
trwp_clk = [tag_rw_port[i].clk for i in range(WAYS)]
trwp_addr = [tag_rw_port[i].addr for i in range(WAYS)]
trwp_data_i = [tag_rw_port[i].data_i for i in range(WAYS)]
trwp_data_o = [tag_rw_port[i].data_o for i in range(WAYS)]
trwp_we = [tag_rw_port[i].we for i in range(WAYS)]
@always_comb
def tag_rport():
for i in range(WAYS):
trwp_clk[i].next = clk_i
trwp_addr[i].next = cpu_wbs.addr_i[WAY_WIDTH:BLOCK_WIDTH]
trwp_data_i[i].next = tag_in[i]
trwp_we[i].next = tag_we
tag_out[i].next = trwp_data_o[i]
# LRU memory
tag_lru_rw_port.clk.next = clk_i
tag_lru_rw_port.data_i.next = lru_in
lru_out.next = tag_lru_rw_port.data_o
tag_lru_rw_port.addr.next = cpu_wbs.addr_i[WAY_WIDTH:BLOCK_WIDTH]
tag_lru_rw_port.we.next = tag_we
@always_comb
def next_state_logic():
n_state.next = state
if state == ic_states.IDLE:
if invalidate:
# cache flush
n_state.next = ic_states.FLUSH
elif cpu_wbs.cyc_i and not cpu_wbs.we_i:
# miss: refill line
n_state.next = ic_states.READ
elif state == ic_states.READ:
if not miss:
# miss: refill line
n_state.next = ic_states.IDLE
else:
n_state.next = ic_states.FETCH
elif state == ic_states.FETCH:
# fetch a line from memory
if final_fetch:
n_state.next = ic_states.IDLE
elif state == ic_states.FLUSH:
# invalidate tag memory
if final_flush:
n_state.next = ic_states.FLUSH_LAST
else:
n_state.next = ic_states.FLUSH
elif state == ic_states.FLUSH_LAST:
# last cycle for flush
n_state.next = ic_states.IDLE
@always(clk_i.posedge)
def update_state():
if rst_i:
state.next = ic_states.FLUSH
else:
state.next = n_state
@always_comb
def fetch_fsm():
n_refill_addr.next = refill_addr
n_refill_valid.next = False # refill_valid
if state == ic_states.IDLE:
if invalidate:
n_refill_valid.next = False
elif state == ic_states.READ:
if miss:
n_refill_addr.next = concat(cpu_wbs.addr_i[LIMIT_WIDTH:BLOCK_WIDTH], modbv(0)[BLOCK_WIDTH - 2:])
n_refill_valid.next = True # not mem_wbm.ready?
elif state == ic_states.FETCH:
n_refill_valid.next = True
if refill_valid and mem_wbm.ack_i:
if final_fetch:
n_refill_valid.next = False
n_refill_addr.next = 0
else:
n_refill_valid.next = True
n_refill_addr.next = refill_addr + modbv(1)[BLOCK_WIDTH - 2:]
@always(clk_i.posedge)
def update_fetch():
if rst_i:
refill_addr.next = 0
refill_valid.next = False
else:
refill_addr.next = n_refill_addr
refill_valid.next = n_refill_valid
@always_comb
def tag_write():
for i in range(0, WAYS):
tag_in[i].next = tag_out[i]
tag_we.next = False
lru_in.next = lru_out
if state == ic_states.IDLE:
if invalidate:
tag_we.next = False
elif state == ic_states.READ:
if miss:
for i in range(0, WAYS):
if lru_select[i]:
tag_in[i].next = concat(True, cpu_wbs.addr_i[LIMIT_WIDTH:WAY_WIDTH])
tag_we.next = True
else:
lru_in.next = update_lru
tag_we.next = True
@always_comb
def flush_next_state():
n_flush_we.next = False
n_flush_addr.next = flush_addr
if state == ic_states.IDLE:
if invalidate:
n_flush_addr.next = modbv(-1)[SET_WIDTH:]
n_flush_we.next = True
elif state == ic_states.FLUSH:
n_flush_addr.next = flush_addr - modbv(1)[SET_WIDTH:]
n_flush_we.next = True
elif state == ic_states.FLUSH_LAST:
n_flush_we.next = False
@always(clk_i.posedge)
def update_flush():
if rst_i:
flush_addr.next = modbv(-1)[SET_WIDTH:]
flush_we.next = False
else:
flush_addr.next = n_flush_addr
flush_we.next = n_flush_we
tfp_clk = [tag_flush_port[i].clk for i in range(WAYS)]
tfp_addr = [tag_flush_port[i].addr for i in range(WAYS)]
tfp_data_i = [tag_flush_port[i].data_i for i in range(WAYS)]
tfp_we = [tag_flush_port[i].we for i in range(WAYS)]
@always_comb
def tag_flush_port_assign():
for i in range(WAYS):
tfp_clk[i].next = clk_i
tfp_addr[i].next = flush_addr
tfp_data_i[i].next = modbv(0)[TAGMEM_WAY_WIDTH:]
tfp_we[i].next = flush_we
# connect to the LRU memory
tag_lru_flush_port.clk.next = clk_i
tag_lru_flush_port.addr.next = flush_addr
tag_lru_flush_port.data_i.next = modbv(0)[TAG_LRU_WIDTH:]
tag_lru_flush_port.we.next = flush_we
@always_comb
def cpu_data_assign():
# cpu data_in assignment: instruction.
temp = data_cache[0]
for i in range(0, WAYS):
if not miss_w[i]:
temp = data_cache[i]
cpu_wbs.dat_o.next = temp
@always_comb
def mem_port_assign():
mem_wbm.addr_o.next = concat(refill_addr, modbv(0)[2:])
mem_wbm.dat_o.next = cpu_wbs.dat_i
mem_wbm.sel_o.next = modbv(0)[4:]
# To Verilog
crp_clk = [cache_read_port[i].clk for i in range(0, WAYS)]
crp_addr = [cache_read_port[i].addr for i in range(0, WAYS)]
crp_data_i = [cache_read_port[i].data_i for i in range(0, WAYS)]
crp_we = [cache_read_port[i].we for i in range(0, WAYS)]
@always_comb
def cache_mem_r():
for i in range(0, WAYS):
crp_clk[i].next = clk_i
crp_addr[i].next = cpu_wbs.addr_i[WAY_WIDTH:2]
crp_data_i[i].next = 0xAABBCCDD
crp_we[i].next = False
# To Verilog
cup_clk = [cache_update_port[i].clk for i in range(0, WAYS)]
cup_addr = [cache_update_port[i].addr for i in range(0, WAYS)]
cup_data_i = [cache_update_port[i].data_i for i in range(0, WAYS)]
cup_we = [cache_update_port[i].we for i in range(0, WAYS)]
@always_comb
def cache_mem_update():
for i in range(0, WAYS):
# ignore data_o from update port
cup_clk[i].next = clk_i
cup_addr[i].next = refill_addr[WAY_WIDTH - 2:]
cup_data_i[i].next = mem_wbm.dat_i
cup_we[i].next = lru_select[i] & mem_wbm.ack_i
@always_comb
def wbs_cpu_flags():
cpu_err.next = mem_wbm.err_i
cpu_wait.next = miss_w_and or state != ic_states.READ
cpu_busy.next = busy
@always_comb
def wbm_mem_flags():
mem_read.next = refill_valid and not final_fetch
mem_write.next = False
mem_rmw.next = False
# Remove warnings: Signal is driven but not read
for i in range(WAYS):
cache_update_port[i].data_o = None
tag_flush_port[i].data_o = None
tag_lru_flush_port.data_o = None
# Generate the wishbone interfaces
wbs_cpu = WishboneSlaveGenerator(clk_i, rst_i, cpu_wbs, cpu_busy, cpu_err, cpu_wait).gen_wbs() # noqa
wbm_mem = WishboneMasterGenerator(clk_i, rst_i, mem_wbm, mem_read, mem_write, mem_rmw).gen_wbm() # noqa
# Instantiate tag memories
tag_mem = [RAM_DP(tag_rw_port[i], tag_flush_port[i], A_WIDTH=SET_WIDTH, D_WIDTH=TAGMEM_WAY_WIDTH) for i in range(WAYS)] # noqa
tag_lru = RAM_DP(tag_lru_rw_port, tag_lru_flush_port, A_WIDTH=SET_WIDTH, D_WIDTH=TAG_LRU_WIDTH) # noqa
# instantiate main memory (cache)
cache_mem = [RAM_DP(cache_read_port[i], cache_update_port[i], A_WIDTH=WAY_WIDTH - 2, D_WIDTH=D_WIDTH) for i in range(0, WAYS)] # noqa
# LRU unit.
lru_m = CacheLRU(current_lru, access_lru, update_lru, lru_pre, None, NUMWAYS=WAYS) # noqa
return instances()
else:
@always_comb
def rtl():
mem.addr.next = cpu.addr
mem.dat_o.next = cpu.dat_o
mem.sel.next = cpu.sel
mem.we.next = cpu.we
cpu.dat_i.next = mem.dat_i
cpu.ack.next = mem.ack
cpu.err.next = mem.err
@always(clk_i.posedge)
def classic_cycle():
mem.cyc.next = cpu.cyc if not mem.ack else False
mem.stb.next = cpu.stb if not mem.ack else False
return instances()
