def add_pin(self, name, pin_type="INOUT"):
""" Adds a pin to the pins list. Default type is INOUT signal. """
self.pins.append(name)
self.pin_type[name]=pin_type
debug.check(pin_type in self.valid_signal_types,
"Invalid signaltype for {0}: {1}".format(name,
pin_type))
def add_layout_pin_center_segment(self,
text,
layer,
start,
end,
width=None):
""" Creates a path like pin with center-line convention """
debug.check(start.x == end.x or start.y == end.y,
"Cannot have a non-manhatten layout pin.")
if width == None:
minwidth_layer = drc["minwidth_{}".format(layer)]
else:
minwidth_layer = width
# one of these will be zero
width = max(start.x, end.x) - min(start.x, end.x)
height = max(start.y, end.y) - min(start.y, end.y)
ll_offset = vector(min(start.x, end.x), min(start.y, end.y))
# Shift it down 1/2 a width in the 0 dimension
if height == 0:
ll_offset -= vector(0, 0.5 * minwidth_layer)
if width == 0:
ll_offset -= vector(0.5 * minwidth_layer, 0)
# This makes sure it is long enough, but also it is not 0 width!
height = max(minwidth_layer, height)
width = max(minwidth_layer, width)
return self.add_layout_pin(text, layer, ll_offset, width, height)
def setup_paths():
""" Set up the non-tech related paths. """
debug.info(2, "Setting up paths...")
global OPTS
try:
OPENRAM_HOME = os.path.abspath(os.environ.get("OPENRAM_HOME"))
except:
debug.error("$OPENRAM_HOME is not properly defined.", 1)
debug.check(os.path.isdir(OPENRAM_HOME),
"$OPENRAM_HOME does not exist: {0}".format(OPENRAM_HOME))
# Add all of the subdirs to the python path
# These subdirs are modules and don't need
# to be added: characterizer, verify
subdirlist = [
item for item in os.listdir(OPENRAM_HOME)
if os.path.isdir(os.path.join(OPENRAM_HOME, item))
]
for subdir in subdirlist:
full_path = "{0}/{1}".format(OPENRAM_HOME, subdir)
debug.check(
os.path.isdir(full_path),
"$OPENRAM_HOME/{0} does not exist: {1}".format(subdir, full_path))
if "__pycache__" not in full_path:
sys.path.append("{0}".format(full_path))
if not OPTS.openram_temp.endswith('/'):
OPTS.openram_temp += "/"
debug.info(1, "Temporary files saved in " + OPTS.openram_temp)
def get_dynamic_delay_chain_size(self, previous_stages, previous_fanout):
"""Determine the size of the delay chain used for the Sense Amp Enable using path delays"""
from math import ceil
previous_delay_chain_delay = (
previous_fanout + 1 + self.parasitic_inv_delay) * previous_stages
debug.info(
2, "Previous delay chain produced {} delay units".format(
previous_delay_chain_delay))
delay_fanout = 3 # This can be anything >=2
#The delay chain uses minimum sized inverters. There are (fanout+1)*stages inverters and each
#inverter adds 1 unit of delay (due to minimum size). This also depends on the pinv value
required_delay = self.wl_delay * self.wl_timing_tolerance - (
self.sen_delay - previous_delay_chain_delay)
debug.check(required_delay > 0,
"Cannot size delay chain to have negative delay")
delay_stages = ceil(required_delay /
(delay_fanout + 1 + self.parasitic_inv_delay))
if delay_stages % 2 == 1: #force an even number of stages.
delay_stages += 1
#Fanout can be varied as well but is a little more complicated but potentially optimal.
debug.info(
1,
"Setting delay chain to {} stages with {} fanout to match {} delay"
.format(delay_stages, delay_fanout, required_delay))
return (delay_stages, delay_fanout)
def __init__(self, sram_config, port, name=""):
sram_config.set_local_config(self)
self.port = port
if self.write_size is not None:
self.num_wmasks = int(self.word_size / self.write_size)
else:
self.num_wmasks = 0
if self.num_spare_cols is None:
self.num_spare_cols = 0
if name == "":
name = "port_data_{0}".format(self.port)
design.design.__init__(self, name)
debug.info(
2, "create data port of size {0} with {1} words per row".format(
self.word_size, self.words_per_row))
self.create_netlist()
if not OPTS.netlist_only:
debug.check(
len(self.all_ports) <= 2,
"Bank layout cannot handle more than two ports.")
self.create_layout()
self.add_boundary()
def __init__(self, inv1_size=2, inv2_size=4, name=""):
if name == "":
name = "dff_buf_{0}".format(dff_buf.unique_id)
dff_buf.unique_id += 1
design.design.__init__(self, name)
debug.info(1, "Creating {}".format(self.name))
self.add_comment("inv1: {0} inv2: {1}".format(inv1_size, inv2_size))
# This is specifically for SCMOS where the DFF vdd/gnd rails are more than min width.
# This causes a DRC in the pinv which assumes min width rails. This ensures the output
# contact does not violate spacing to the rail in the NMOS.
debug.check(
inv1_size >= 2,
"Inverter must be greater than two for rail spacing DRC rules.")
debug.check(
inv2_size >= 2,
"Inverter must be greater than two for rail spacing DRC rules.")
self.inv1_size = inv1_size
self.inv2_size = inv2_size
self.create_netlist()
if not OPTS.netlist_only:
self.create_layout()
def setup_paths():
""" Set up the non-tech related paths. """
debug.info(2, "Setting up paths...")
global OPTS
try:
OPENRAM_HOME = os.path.abspath(os.environ.get("OPENRAM_HOME"))
except:
debug.error("$OPENRAM_HOME is not properly defined.", 1)
debug.check(os.path.isdir(OPENRAM_HOME),
"$OPENRAM_HOME does not exist: {0}".format(OPENRAM_HOME))
debug.check(
os.path.isdir(OPENRAM_HOME + "/gdsMill"),
"$OPENRAM_HOME/gdsMill does not exist: {0}".format(OPENRAM_HOME +
"/gdsMill"))
sys.path.append("{0}/gdsMill".format(OPENRAM_HOME))
debug.check(
os.path.isdir(OPENRAM_HOME + "/tests"),
"$OPENRAM_HOME/tests does not exist: {0}".format(OPENRAM_HOME +
"/tests"))
sys.path.append("{0}/tests".format(OPENRAM_HOME))
debug.check(
os.path.isdir(OPENRAM_HOME + "/characterizer"),
"$OPENRAM_HOME/characterizer does not exist: {0}".format(
OPENRAM_HOME + "/characterizer"))
sys.path.append("{0}/characterizer".format(OPENRAM_HOME))
debug.check(
os.path.isdir(OPENRAM_HOME + "/router"),
"$OPENRAM_HOME/router does not exist: {0}".format(OPENRAM_HOME +
"/router"))
sys.path.append("{0}/router".format(OPENRAM_HOME))
if not OPTS.openram_temp.endswith('/'):
OPTS.openram_temp += "/"
debug.info(1, "Temporary files saved in " + OPTS.openram_temp)
cleanup_paths()
# make the directory if it doesn't exist
try:
os.makedirs(OPTS.openram_temp, 0750)
except OSError as e:
if e.errno == 17: # errno.EEXIST
os.chmod(OPTS.openram_temp, 0750)
# Don't delete the output dir, it may have other files!
# make the directory if it doesn't exist
try:
os.makedirs(OPTS.out_path, 0750)
except OSError as e:
if e.errno == 17: # errno.EEXIST
os.chmod(OPTS.out_path, 0750)
if OPTS.out_path == "":
OPTS.out_path = "."
if not OPTS.out_path.endswith('/'):
OPTS.out_path += "/"
debug.info(1, "Output saved in " + OPTS.out_path)
def gen_pwl(self, sig_name, clk_times, data_values, period, slew, setup):
"""
Generate a PWL stimulus given a signal name and data values at each period.
Automatically creates slews and ensures each data occurs a setup before the clock
edge. The first clk_time should be 0 and is the initial time that corresponds
to the initial value.
"""
# the initial value is not a clock time
str = "Clock and data value lengths don't match. {0} clock values, {1} data values for {2}"
debug.check(
len(clk_times) == len(data_values),
str.format(len(clk_times), len(data_values), sig_name))
# shift signal times earlier for setup time
times = np.array(clk_times) - setup * period
values = np.array(data_values) * self.voltage
half_slew = 0.5 * slew
self.sf.write("* (time, data): {}\n".format(
list(zip(clk_times, data_values))))
self.sf.write("V{0} {0} 0 PWL (0n {1}v ".format(sig_name, values[0]))
for i in range(1, len(times)):
self.sf.write("{0}n {1}v {2}n {3}v ".format(
times[i] - half_slew, values[i - 1], times[i] + half_slew,
values[i]))
self.sf.write(")\n")
def __init__(self, gds_name=None, module=None):
"""Use the gds file or the cell for the blockages with the top module topName and
layers for the layers to route on
"""
self.gds_name = gds_name
self.module = module
debug.check(not (gds_name and module),
"Specify only a GDS file or module")
# If we specified a module instead, write it out to read the gds
# This isn't efficient, but easy for now
if module:
gds_name = OPTS.openram_temp + "temp.gds"
module.gds_write(gds_name)
# Load the gds file and read in all the shapes
self.layout = gdsMill.VlsiLayout(units=tech.GDS["unit"])
self.reader = gdsMill.Gds2reader(self.layout)
self.reader.loadFromFile(gds_name)
self.top_name = self.layout.rootStructureName
self.pins = {}
self.blockages = []
# all the paths we've routed so far (to supplement the blockages)
self.paths = []
# The boundary will determine the limits to the size of the routing grid
self.boundary = self.layout.measureBoundary(self.top_name)
self.ll = vector(self.boundary[0])
self.ur = vector(self.boundary[1])
def add_pin(self, pin_name, is_source=False):
"""
Mark the grids that are in the pin rectangle ranges to have the pin property.
pin can be a location or a label.
"""
found_pin = False
for pin in self.pins[pin_name]:
(pin_in_tracks,
blockage_in_tracks) = self.convert_pin_to_tracks(pin)
if (len(pin_in_tracks) > 0):
found_pin = True
if is_source:
debug.info(
1,
"Set source: " + str(pin_name) + " " + str(pin_in_tracks))
self.rg.add_source(pin_in_tracks)
else:
debug.info(
1,
"Set target: " + str(pin_name) + " " + str(pin_in_tracks))
self.rg.add_target(pin_in_tracks)
self.rg.add_blockage(blockage_in_tracks)
if not found_pin:
self.write_debug_gds()
debug.check(found_pin, "Unable to find pin on grid.")
def get_enable_name(self):
"""Returns name used for enable net"""
# FIXME: A better programmatic solution to designate pins
enable_name = self.en_name
debug.check(enable_name in self.pin_names,
"Enable name {} not found in pin list".format(enable_name))
return enable_name
def import_tech():
""" Dynamically adds the tech directory to the path and imports it. """
global OPTS
debug.info(2,"Importing technology: " + OPTS.tech_name)
# environment variable should point to the technology dir
try:
OPENRAM_TECH = os.path.abspath(os.environ.get("OPENRAM_TECH"))
except:
debug.error("$OPENRAM_TECH environment variable is not defined.",1)
# Add all of the paths
for tech_path in OPENRAM_TECH.split(":"):
debug.check(os.path.isdir(tech_path),"$OPENRAM_TECH does not exist: {0}".format(tech_path))
sys.path.append(tech_path)
debug.info(1, "Adding technology path: {}".format(tech_path))
# Import the tech
try:
tech_mod = __import__(OPTS.tech_name)
except ImportError:
debug.error("Nonexistent technology_setup_file: {0}.py".format(filename), -1)
OPTS.openram_tech = os.path.dirname(tech_mod.__file__) + "/"
# Add the tech directory
tech_path = OPTS.openram_tech
sys.path.append(tech_path)
try:
import tech
except ImportError:
debug.error("Could not load tech module.", -1)
def DRC_LVS(self, final_verification=False, top_level=False):
"""Checks both DRC and LVS for a module"""
# Final verification option does not allow nets to be connected by label.
# Unit tests will check themselves.
if OPTS.is_unit_test:
return
if not OPTS.check_lvsdrc:
return
# Do not run if disabled in options.
if (OPTS.inline_lvsdrc or top_level):
global total_drc_errors
global total_lvs_errors
tempspice = "{0}/{1}.sp".format(OPTS.openram_temp,self.name)
tempgds = "{0}/{1}.gds".format(OPTS.openram_temp,self.name)
self.sp_write(tempspice)
self.gds_write(tempgds)
num_drc_errors = verify.run_drc(self.name, tempgds, final_verification)
num_lvs_errors = verify.run_lvs(self.name, tempgds, tempspice, final_verification)
debug.check(num_drc_errors == 0,"DRC failed for {0} with {1} error(s)".format(self.name,num_drc_errors))
debug.check(num_lvs_errors == 0,"LVS failed for {0} with {1} errors(s)".format(self.name,num_lvs_errors))
total_drc_errors += num_drc_errors
total_lvs_errors += num_lvs_errors
os.remove(tempspice)
os.remove(tempgds)
def add_via_center(self, layers, offset, size=[1,1], mirror="R0", rotate=0, implant_type=None, well_type=None):
""" Add a three layer via structure by the center coordinate accounting for mirroring and rotation. """
import contact
via = contact.contact(layer_stack=layers,
dimensions=size,
implant_type=implant_type,
well_type=well_type)
height = via.height
width = via.width
debug.check(mirror=="R0","Use rotate to rotate vias instead of mirror.")
if rotate==0:
corrected_offset = offset + vector(-0.5*width,-0.5*height)
elif rotate==90:
corrected_offset = offset + vector(0.5*height,-0.5*width)
elif rotate==180:
corrected_offset = offset + vector(0.5*width,0.5*height)
elif rotate==270:
corrected_offset = offset + vector(-0.5*height,0.5*width)
else:
debug.error("Invalid rotation argument.",-1)
#print(rotate,offset,"->",corrected_offset)
self.add_mod(via)
inst=self.add_inst(name=via.name,
mod=via,
offset=corrected_offset,
mirror=mirror,
rotate=rotate)
# We don't model the logical connectivity of wires/paths
self.connect_inst([])
return inst
def add_read(self, comment, address, port):
""" Add the control values for a read cycle. """
debug.check(
port in self.read_ports,
"Cannot add read cycle to a write port. Port {0}, Read Ports {1}".
format(port, self.read_ports))
debug.info(2, comment)
self.fn_cycle_comments.append(comment)
self.append_cycle_comment(port, comment)
self.cycle_times.append(self.t_current)
self.t_current += self.period
self.add_control_one_port(port, "read")
self.add_address(address, port)
# If the port is also a readwrite then add
# the same value as previous cycle
if port in self.write_ports:
try:
self.add_data(self.data_value[port][-1], port)
except:
self.add_data("0" * (self.word_size + self.num_spare_cols),
port)
try:
self.add_wmask(self.wmask_value[port][-1], port)
except:
self.add_wmask("0" * self.num_wmasks, port)
self.add_spare_wen("0" * self.num_spare_cols, port)
#Add noops to all other ports.
for unselected_port in self.all_ports:
if unselected_port != port:
self.add_noop_one_port(unselected_port)
def analyze(self, probe_address, probe_data, slews, loads):
"""
Main function to test the delays of different bits.
"""
debug.check(
OPTS.num_rw_ports < 2 and OPTS.num_w_ports < 1
and OPTS.num_r_ports < 1,
"Bit testing does not currently support multiport.")
#Dict to hold all characterization values
char_sram_data = {}
self.set_probe(probe_address, probe_data)
#self.prepare_netlist()
self.load = max(loads)
self.slew = max(slews)
# 1) Find a feasible period and it's corresponding delays using the trimmed array.
feasible_delays = self.find_feasible_period()
# 2) Find the delays of several bits
test_bits = self.get_test_bits()
bit_delays = self.simulate_for_bit_delays(test_bits)
for i in range(len(test_bits)):
debug.info(
1,
"Bit tested: addr {0[0]} data_pos {0[1]}\n Values {1}".format(
test_bits[i], bit_delays[i]))
def connect_bitline(self, inst1, inst2, inst1_name, inst2_name):
"""
Connect two pins of two modules.
This assumes that they have sufficient space to create a jog
in the middle between the two modules (if needed).
"""
# determine top and bottom automatically.
# since they don't overlap, we can just check the bottom y coordinate.
if inst1.by() < inst2.by():
(bottom_inst, bottom_name) = (inst1, inst1_name)
(top_inst, top_name) = (inst2, inst2_name)
else:
(bottom_inst, bottom_name) = (inst2, inst2_name)
(top_inst, top_name) = (inst1, inst1_name)
bottom_pin = bottom_inst.get_pin(bottom_name)
top_pin = top_inst.get_pin(top_name)
debug.check(bottom_pin.layer == top_pin.layer,
"Pin layers do not match.")
bottom_loc = bottom_pin.uc()
top_loc = top_pin.bc()
yoffset = 0.5 * (top_loc.y + bottom_loc.y)
self.add_path(top_pin.layer, [
bottom_loc,
vector(bottom_loc.x, yoffset),
vector(top_loc.x, yoffset), top_loc
])
def get_wl_name(self, port=0):
"""Get wl name"""
if props.bitcell.split_wl:
return "wl{}".format(port)
else:
debug.check(port == 0, "One port for bitcell only.")
return props.bitcell.cell_6t.pin.wl
def setup_paths():
""" Set up the non-tech related paths. """
debug.info(2, "Setting up paths...")
global OPTS
try:
OPENRAM_HOME = os.path.abspath(os.environ.get("OPENRAM_HOME"))
except:
debug.error("$OPENRAM_HOME is not properly defined.", 1)
debug.check(os.path.isdir(OPENRAM_HOME),
"$OPENRAM_HOME does not exist: {0}".format(OPENRAM_HOME))
# Add all of the subdirs to the python path
# These subdirs are modules and don't need to be added: characterizer, verify
for subdir in ["gdsMill", "tests", "router", "modules", "base", "pgates"]:
full_path = "{0}/{1}".format(OPENRAM_HOME, subdir)
debug.check(
os.path.isdir(full_path),
"$OPENRAM_HOME/{0} does not exist: {1}".format(subdir, full_path))
sys.path.append("{0}".format(full_path))
if not OPTS.openram_temp.endswith('/'):
OPTS.openram_temp += "/"
debug.info(1, "Temporary files saved in " + OPTS.openram_temp)
cleanup_paths()
# make the directory if it doesn't exist
try:
os.makedirs(OPTS.openram_temp, 0o750)
except OSError as e:
if e.errno == 17: # errno.EEXIST
os.chmod(OPTS.openram_temp, 0o750)
def __init__(self, sram_config, name=""):
self.sram_config = sram_config
sram_config.set_local_config(self)
if self.write_size:
self.num_wmasks = int(self.word_size / self.write_size)
else:
self.num_wmasks = 0
if name == "":
name = "bank_{0}_{1}".format(self.word_size, self.num_words)
design.design.__init__(self, name)
debug.info(
2, "create sram of size {0} with {1} words".format(
self.word_size, self.num_words))
# The local control signals are gated when we have bank select logic,
# so this prefix will be added to all of the input signals to create
# the internal gated signals.
if self.num_banks > 1:
self.prefix = "gated_"
else:
self.prefix = ""
self.create_netlist()
if not OPTS.netlist_only:
debug.check(
len(self.all_ports) <= 2,
"Bank layout cannot handle more than two ports.")
self.create_layout()
self.add_boundary()
def LVS(self, final_verification=False):
"""Checks LVS for a module"""
import verify
# Unit tests will check themselves.
# Do not run if disabled in options.
# No layout to check
if OPTS.netlist_only:
return
elif (not OPTS.is_unit_test and OPTS.check_lvsdrc
and (OPTS.inline_lvsdrc or final_verification)):
tempspice = "{0}/{1}.sp".format(OPTS.openram_temp, self.name)
tempgds = "{0}/{1}.gds".format(OPTS.openram_temp, self.name)
self.lvs_write(tempspice)
self.gds_write(tempgds)
num_errors = verify.run_lvs(self.name,
tempgds,
tempspice,
final_verification=final_verification)
debug.check(
num_errors == 0, "LVS failed for {0} with {1} error(s)".format(
self.name, num_errors))
if OPTS.purge_temp:
os.remove(tempspice)
os.remove(tempgds)
def __init__(self, sram_config, port, bit_offsets=None, name=""):
sram_config.set_local_config(self)
self.port = port
if self.write_size is not None:
self.num_wmasks = int(math.ceil(self.word_size / self.write_size))
else:
self.num_wmasks = 0
if self.num_spare_cols is None:
self.num_spare_cols = 0
if not bit_offsets:
bitcell = factory.create(module_type="bitcell")
self.bit_offsets = []
for i in range(self.num_cols + self.num_spare_cols):
self.bit_offsets.append(i * bitcell.width)
else:
self.bit_offsets = bit_offsets
if name == "":
name = "port_data_{0}".format(self.port)
super().__init__(name)
debug.info(
2, "create data port of size {0} with {1} words per row".format(
self.word_size, self.words_per_row))
self.create_netlist()
if not OPTS.netlist_only:
debug.check(
len(self.all_ports) <= 2,
"Bank layout cannot handle more than two ports.")
self.create_layout()
self.add_boundary()
def retrieve_pins(self, pin_name):
"""
Retrieve the pin shapes on metal 3 from the layout.
"""
debug.info(2, "Retrieving pins for {}.".format(pin_name))
shape_list = self.layout.getAllPinShapes(str(pin_name))
pin_set = set()
for shape in shape_list:
(layer, boundary) = shape
# GDSMill boundaries are in (left, bottom, right, top) order
# so repack and snap to the grid
ll = vector(boundary[0], boundary[1]).snap_to_grid()
ur = vector(boundary[2], boundary[3]).snap_to_grid()
rect = [ll, ur]
pin = pin_layout(pin_name, rect, layer)
pin_set.add(pin)
debug.check(len(pin_set) > 0,
"Did not find any pin shapes for {0}.".format(str(pin_name)))
self.pins[pin_name] = pin_set
self.all_pins.update(pin_set)
for pin in self.pins[pin_name]:
debug.info(3, "Retrieved pin {}".format(str(pin)))
def __init__(self, name, mod, offset=[0, 0], mirror="R0", rotate=0):
"""Initializes an instance to represent a module"""
geometry.__init__(self)
debug.check(
mirror not in ["R90", "R180", "R270"],
"Please use rotation and not mirroring during instantiation.")
self.name = name
self.mod = mod
self.gds = mod.gds
self.rotate = rotate
self.offset = vector(offset).snap_to_grid()
self.mirror = mirror
if OPTS.netlist_only:
self.width = 0
self.height = 0
else:
if mirror in ["R90", "R270"] or rotate in [90, 270]:
self.width = round_to_grid(mod.height)
self.height = round_to_grid(mod.width)
else:
self.width = round_to_grid(mod.width)
self.height = round_to_grid(mod.height)
self.compute_boundary(offset, mirror, rotate)
debug.info(4, "creating instance: " + self.name)
def compute_sizes(self):
""" Computes the organization of the memory using bitcell size by trying to make it square."""
debug.check(self.num_banks in [1, 2, 4],
"Valid number of banks are 1 , 2 and 4.")
self.num_words_per_bank = self.num_words / self.num_banks
self.num_bits_per_bank = self.word_size * self.num_words_per_bank
# Compute the area of the bitcells and estimate a square bank (excluding auxiliary circuitry)
self.bank_area = self.bitcell.width * self.bitcell.height * self.num_bits_per_bank
self.bank_side_length = sqrt(self.bank_area)
# Estimate the words per row given the height of the bitcell and the square side length
self.tentative_num_cols = int(self.bank_side_length /
self.bitcell.width)
self.words_per_row = self.estimate_words_per_row(
self.tentative_num_cols, self.word_size)
# Estimate the number of rows given the tentative words per row
self.tentative_num_rows = self.num_bits_per_bank / (
self.words_per_row * self.word_size)
self.words_per_row = self.amend_words_per_row(self.tentative_num_rows,
self.words_per_row)
# Fix the number of columns and rows
self.num_cols = self.words_per_row * self.word_size
self.num_rows = self.num_words_per_bank / self.words_per_row
# Compute the address and bank sizes
self.row_addr_size = int(log(self.num_rows, 2))
self.col_addr_size = int(log(self.words_per_row, 2))
self.bank_addr_size = self.col_addr_size + self.row_addr_size
self.addr_size = self.bank_addr_size + int(log(self.num_banks, 2))
def compute_sizes(self):
""" Computes the organization of the memory using bitcell size by trying to make it square."""
self.bitcell = factory.create(module_type="bitcell")
debug.check(self.num_banks in [1,2,4], "Valid number of banks are 1 , 2 and 4.")
self.num_words_per_bank = self.num_words/self.num_banks
self.num_bits_per_bank = self.word_size*self.num_words_per_bank
# If this was hard coded, don't dynamically compute it!
if not self.words_per_row:
# Compute the area of the bitcells and estimate a square bank (excluding auxiliary circuitry)
self.bank_area = self.bitcell.width*self.bitcell.height*self.num_bits_per_bank
self.bank_side_length = sqrt(self.bank_area)
# Estimate the words per row given the height of the bitcell and the square side length
self.tentative_num_cols = int(self.bank_side_length/self.bitcell.width)
self.words_per_row = self.estimate_words_per_row(self.tentative_num_cols, self.word_size)
# Estimate the number of rows given the tentative words per row
self.tentative_num_rows = self.num_bits_per_bank / (self.words_per_row*self.word_size)
self.words_per_row = self.amend_words_per_row(self.tentative_num_rows, self.words_per_row)
debug.info(1,"Words per row: {}".format(self.words_per_row))
self.recompute_sizes()
def compute_bus_sizes(self):
""" Compute the independent bus widths shared between two and four bank SRAMs """
# address size + control signals + one-hot bank select signals
self.num_vertical_line = self.addr_size + self.control_size + log(
self.num_banks, 2) + 1
# data bus size
self.num_horizontal_line = self.word_size
self.vertical_bus_width = self.m2_pitch * self.num_vertical_line
# vertical bus height depends on 2 or 4 banks
self.data_bus_height = self.m3_pitch * self.num_horizontal_line
self.data_bus_width = 2 * (self.bank.width + self.bank_to_bus_distance
) + self.vertical_bus_width
self.control_bus_height = self.m1_pitch * (self.control_size + 2)
self.control_bus_width = self.bank.width + self.bank_to_bus_distance + self.vertical_bus_width
self.supply_bus_height = self.m1_pitch * 2 # 2 for vdd/gnd placed with control bus
self.supply_bus_width = self.data_bus_width
# Sanity check to ensure we can fit the control logic above a single bank (0.9 is a hack really)
debug.check(
self.bank.width + self.vertical_bus_width >
0.9 * self.control_logic.width,
"Bank is too small compared to control logic.")
def __init__(self, name, size=1, height=None, add_wells=True):
""" Creates a cell for a simple 3 input nand """
debug.info(2,
"creating pnand4 structure {0} with size of {1}".format(name,
size))
self.add_comment("size: {}".format(size))
# We have trouble pitch matching a 3x sizes to the bitcell...
# If we relax this, we could size this better.
self.size = size
self.nmos_size = 2 * size
self.pmos_size = parameter["beta"] * size
self.nmos_width = self.nmos_size * drc("minwidth_tx")
self.pmos_width = self.pmos_size * drc("minwidth_tx")
# FIXME: Allow these to be sized
debug.check(size == 1,
"Size 1 pnand4 is only supported now.")
self.tx_mults = 1
if OPTS.tech_name == "sky130":
self.nmos_width = self.nearest_bin("nmos", self.nmos_width)
self.pmos_width = self.nearest_bin("pmos", self.pmos_width)
# Creates the netlist and layout
super().__init__(name, height, add_wells)
def import_tech():
global OPTS
debug.info(2,"Importing technology: " + OPTS.tech_name)
# Set the tech to the config file we read in instead of the command line value.
OPTS.tech_name = OPTS.tech_name
# environment variable should point to the technology dir
try:
OPENRAM_TECH = os.path.abspath(os.environ.get("OPENRAM_TECH"))
except:
debug.error("$OPENRAM_TECH is not properly defined.",1)
debug.check(os.path.isdir(OPENRAM_TECH),"$OPENRAM_TECH does not exist: {0}".format(OPENRAM_TECH))
OPTS.openram_tech = OPENRAM_TECH + "/" + OPTS.tech_name
if not OPTS.openram_tech.endswith('/'):
OPTS.openram_tech += "/"
debug.info(1, "Technology path is " + OPTS.openram_tech)
try:
filename = "setup_openram_{0}".format(OPTS.tech_name)
# we assume that the setup scripts (and tech dirs) are located at the
# same level as the compielr itself, probably not a good idea though.
path = "{0}/setup_scripts".format(os.environ.get("OPENRAM_TECH"))
debug.check(os.path.isdir(path),"OPENRAM_TECH does not exist: {0}".format(path))
sys.path.append(os.path.abspath(path))
__import__(filename)
except ImportError:
debug.error("Nonexistent technology_setup_file: {0}.py".format(filename))
sys.exit(1)
def add_read_one_port(self, comment, address, port):
""" Add the control values for a read cycle. Does not increment the period. """
debug.check(
port in self.read_ports,
"Cannot add read cycle to a write port. Port {0}, Read Ports {1}".
format(port, self.read_ports))
debug.info(2, comment)
self.fn_cycle_comments.append(comment)
self.add_control_one_port(port, "read")
self.add_address(address, port)
# If the port is also a readwrite then add
# the same value as previous cycle
if port in self.write_ports:
try:
self.add_data(self.data_value[port][-1], port)
except:
self.add_data("0" * (self.word_size + self.num_spare_cols),
port)
try:
self.add_wmask(self.wmask_value[port][-1], port)
except:
self.add_wmask("0" * self.num_wmasks, port)
self.add_spare_wen("0" * self.num_spare_cols, port)
def disassemble(buf, virt, sections, binary):
'''
Disassemble a block of x64 code.
'''
virts = [(sections[sect]['virt'], sections[sect]['length']) for sect in sections if sections[sect]['virt']]
objmin = min(virt[0] for virt in virts)
objmax = max(virt[0]+virt[1] for virt in virts)
objbounds = (objmin, objmax)
FORMAT="INTEL"
entries = [virt]
result = {}
while entries:
addr = entries.pop()
off = addr-virt
while off < len(buf):
p = Opcode(buf[off:], mode=64)
pre = p.getPrefix()
length = p.getSize()
try:
ins, r, w = p.getOpcode(FORMAT)
except ValueError:
break
ins = repr_ins(ins, r, w, objbounds, sections, binary)
if debug.check('asm_rw'):
print(ins, r, w)
debug_dis = {
'prefix': pre,
'binary': buf[off:off+length]
}
result[addr] = {'ins': ins, 'loc': addr, 'length': length, 'debug': debug_dis, 'display': True}
if ins['op'] == 'return':
break
# if ins['op'] == 'call':
# j_addr = addr+length+ins['dest']['repr']
# if j_addr not in result:
# entries.append(j_addr)
if ins['op'] == 'jump':
j_addr = addr+length+ins['dest']['repr']
if j_addr not in result:
entries.append(j_addr)
result[addr]['display'] = False
if ins['cond'] == 'true':
break
off += length
addr += length
return [result[key] for key in sorted(result.keys())]
def output_line(line, indent):
'''
Output a line of code. A line contains an instruction and
some metainformation about that instruction (its location,
etc.)
The pseudo-EBNF of lines is as follows:
line = location, debug, instruction
instruction = op, argument*
argument = value, repr | instruction
'''
def output_ins(ins):
'''
Decompile an instruction. Instructions are trees, see
the EBNF for output_line.
'''
repr = {}
prec = {}
for k, arg in ins.items():
if k not in ('src', 'dest'):
continue
if 'op' in ins[k]:
lhs, rhs, prec[k] = output_ins(ins[k])
repr[k] = rhs
else:
repr[k] = ins[k]['repr']
prec[k] = 20
if type(repr[k]) == int:
repr[k] = repr_int(repr[k])
if ins['op'] == 'apply':
lhs = ''
args = []
for arg in ins['args']:
if 'op' in arg:
lhs, rhs, inner_prec = output_ins(arg)
args.append(rhs)
else:
args.append(arg['repr'])
rhs = '{fun}({args})'.format(fun=ins['function'], args=', '.join(args))
outer_prec = 20
else:
try:
lhs, rhs, outer_prec = output_op(ins['op'])
except KeyError:
lhs, rhs = '', '/* Unsupported immediate instruction: {ins[op]} */'.format(ins=ins)
outer_prec = 20
for k in dict(repr):
if outer_prec > prec[k]:
repr[k] = '(' + repr[k] + ')'
return lhs.format(i=repr), rhs.format(i=repr), outer_prec
lhs, rhs, prec = output_ins(line['ins'])
line_repr = indent.out() + lhs + rhs
if lhs+rhs != '':
line_repr += ';'
if not line['display']:
line_repr = ''
if debug.check('misc'):
from binascii import hexlify
line_repr += '\n{indent}{blue}/* {line} */{black}'.format(indent=indent.out(), line=line, blue='\033[94m', black='\033[0m')
return line_repr
