def __init__(self, bits_sign=None, name=None, variable=False, reset=0, name_override=None, min=None, max=None, related=None, attribute=""):
from litex.gen.fhdl.bitcontainer import bits_for
_Value.__init__(self)
# determine number of bits and signedness
if bits_sign is None:
if min is None:
min = 0
if max is None:
max = 2
max -= 1 # make both bounds inclusive
assert(min < max)
self.signed = min < 0 or max < 0
self.nbits = _builtins.max(bits_for(min, self.signed), bits_for(max, self.signed))
else:
assert(min is None and max is None)
if isinstance(bits_sign, tuple):
self.nbits, self.signed = bits_sign
else:
self.nbits, self.signed = bits_sign, False
if not isinstance(self.nbits, int) or self.nbits <= 0:
raise ValueError("Signal width must be a strictly positive integer")
self.variable = variable # deprecated
self.reset = reset
self.name_override = name_override
self.backtrace = _tracer.trace_back(name)
self.related = related
self.attribute = attribute
def __init__(self, bits_sign=None, name=None, variable=False, reset=0,
reset_less=False, name_override=None, min=None, max=None,
related=None, attr=None):
from litex.gen.fhdl.bitcontainer import bits_for
_Value.__init__(self)
for n in [name, name_override]:
if n is not None and not self._name_re.match(n):
raise ValueError("Signal name {} is not a valid Python identifier"
.format(repr(n)))
# determine number of bits and signedness
if bits_sign is None:
if min is None:
min = 0
if max is None:
max = 2
max -= 1 # make both bounds inclusive
assert(min < max)
self.signed = min < 0 or max < 0
self.nbits = _builtins.max(bits_for(min, self.signed), bits_for(max, self.signed))
else:
assert(min is None and max is None)
if isinstance(bits_sign, tuple):
self.nbits, self.signed = bits_sign
else:
self.nbits, self.signed = bits_sign, False
if isinstance(reset, (bool, int)):
reset = Constant(reset, (self.nbits, self.signed))
if not isinstance(self.nbits, int) or self.nbits <= 0:
raise ValueError("Signal width must be a strictly positive integer")
if attr is None:
attr = set()
self.variable = variable # deprecated
self.reset = reset
self.reset_less = reset_less
self.name_override = name_override
self.backtrace = _tracer.trace_back(name)
self.related = related
self.attr = attr
def __init__(self,
bits_sign=None,
name=None,
variable=False,
reset=0,
name_override=None,
min=None,
max=None,
related=None,
attribute=""):
from litex.gen.fhdl.bitcontainer import bits_for
_Value.__init__(self)
# determine number of bits and signedness
if bits_sign is None:
if min is None:
min = 0
if max is None:
max = 2
max -= 1 # make both bounds inclusive
assert (min < max)
self.signed = min < 0 or max < 0
self.nbits = _builtins.max(bits_for(min, self.signed),
bits_for(max, self.signed))
else:
assert (min is None and max is None)
if isinstance(bits_sign, tuple):
self.nbits, self.signed = bits_sign
else:
self.nbits, self.signed = bits_sign, False
if not isinstance(self.nbits, int) or self.nbits <= 0:
raise ValueError(
"Signal width must be a strictly positive integer")
self.variable = variable # deprecated
self.reset = reset
self.name_override = name_override
self.backtrace = _tracer.trace_back(name)
self.related = related
self.attribute = attribute
def __init__(self, t):
self.wait = Signal()
self.done = Signal()
# # #
count = Signal(bits_for(t), reset=t)
self.comb += self.done.eq(count == 0)
self.sync += \
If(self.wait,
If(~self.done, count.eq(count - 1))
).Else(count.eq(count.reset))
def __init__(self, t):
self.wait = Signal()
self.done = Signal()
# # #
count = Signal(bits_for(t), reset=t)
self.comb += self.done.eq(count == 0)
self.sync += \
If(self.wait,
If(~self.done, count.eq(count - 1))
).Else(count.eq(count.reset))
def __init__(self, value, bits_sign=None):
from litex.gen.fhdl.bitcontainer import bits_for
_Value.__init__(self)
self.value = int(value)
if bits_sign is None:
bits_sign = bits_for(self.value), self.value < 0
elif isinstance(bits_sign, int):
bits_sign = bits_sign, self.value < 0
self.nbits, self.signed = bits_sign
if not isinstance(self.nbits, int) or self.nbits <= 0:
raise TypeError("Width must be a strictly positive integer")
def __init__(self, value, bits_sign=None):
from litex.gen.fhdl.bitcontainer import bits_for
_Value.__init__(self)
self.value = int(value)
if bits_sign is None:
bits_sign = bits_for(self.value), self.value < 0
elif isinstance(bits_sign, int):
bits_sign = bits_sign, self.value < 0
self.nbits, self.signed = bits_sign
if not isinstance(self.nbits, int) or self.nbits <= 0:
raise TypeError("Width must be a strictly positive integer")
def emit_verilog(memory, ns, add_data_file):
r = ""
def gn(e):
if isinstance(e, Memory):
return ns.get_name(e)
else:
return verilog_printexpr(ns, e)[0]
adrbits = bits_for(memory.depth-1)
r += "reg [" + str(memory.width-1) + ":0] " \
+ gn(memory) \
+ "[0:" + str(memory.depth-1) + "];\n"
adr_regs = {}
data_regs = {}
for port in memory.ports:
if not port.async_read:
if port.mode == WRITE_FIRST and port.we is not None:
adr_reg = Signal(name_override="memadr")
r += "reg [" + str(adrbits-1) + ":0] " \
+ gn(adr_reg) + ";\n"
adr_regs[id(port)] = adr_reg
else:
data_reg = Signal(name_override="memdat")
r += "reg [" + str(memory.width-1) + ":0] " \
+ gn(data_reg) + ";\n"
data_regs[id(port)] = data_reg
for port in memory.ports:
r += "always @(posedge " + gn(port.clock) + ") begin\n"
if port.we is not None:
if port.we_granularity:
n = memory.width//port.we_granularity
for i in range(n):
m = i*port.we_granularity
M = (i+1)*port.we_granularity-1
sl = "[" + str(M) + ":" + str(m) + "]"
r += "\tif (" + gn(port.we) + "[" + str(i) + "])\n"
r += "\t\t" + gn(memory) + "[" + gn(port.adr) + "]" + sl + " <= " + gn(port.dat_w) + sl + ";\n"
else:
r += "\tif (" + gn(port.we) + ")\n"
r += "\t\t" + gn(memory) + "[" + gn(port.adr) + "] <= " + gn(port.dat_w) + ";\n"
if not port.async_read:
if port.mode == WRITE_FIRST and port.we is not None:
rd = "\t" + gn(adr_regs[id(port)]) + " <= " + gn(port.adr) + ";\n"
else:
bassign = gn(data_regs[id(port)]) + " <= " + gn(memory) + "[" + gn(port.adr) + "];\n"
if port.mode == READ_FIRST or port.we is None:
rd = "\t" + bassign
elif port.mode == NO_CHANGE:
rd = "\tif (!" + gn(port.we) + ")\n" \
+ "\t\t" + bassign
if port.re is None:
r += rd
else:
r += "\tif (" + gn(port.re) + ")\n"
r += "\t" + rd.replace("\n\t", "\n\t\t")
r += "end\n\n"
for port in memory.ports:
if port.async_read:
r += "assign " + gn(port.dat_r) + " = " + gn(memory) + "[" + gn(port.adr) + "];\n"
else:
if port.mode == WRITE_FIRST and port.we is not None:
r += "assign " + gn(port.dat_r) + " = " + gn(memory) + "[" + gn(adr_regs[id(port)]) + "];\n"
else:
r += "assign " + gn(port.dat_r) + " = " + gn(data_regs[id(port)]) + ";\n"
r += "\n"
if memory.init is not None:
content = ""
for d in memory.init:
content += "{:x}\n".format(d)
memory_filename = add_data_file(gn(memory) + ".init", content)
r += "initial begin\n"
r += "\t$readmemh(\"" + memory_filename + "\", " + gn(memory) + ");\n"
r += "end\n\n"
return r