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stream: set reset_less to True on datapath signals. 

Reset is only required on control signals.
This commit is contained in:
Florent Kermarrec 2020-04-06 11:33:49 +02:00
parent cf1c5d99b3
commit a35df4f7d1
1 changed files with 14 additions and 4 deletions
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18
litex/soc/interconnect/stream.py
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@ -25,6 +25,12 @@ def _make_m2s(layout):
r.append((f[0], _make_m2s(f[1]))) r.append((f[0], _make_m2s(f[1])))
return r return r
def set_reset_less(field):
if isinstance(field, Signal):
field.reset_less = True
elif isinstance(field, Record):
for s, _ in field.iter_flat():
s.reset_less = True
class EndpointDescription: class EndpointDescription:
def __init__(self, payload_layout, param_layout=[]): def __init__(self, payload_layout, param_layout=[]):
@ -59,6 +65,10 @@ class Endpoint(Record):
else: else:
self.description = EndpointDescription(description_or_layout) self.description = EndpointDescription(description_or_layout)
Record.__init__(self, self.description.get_full_layout(), name, **kwargs) Record.__init__(self, self.description.get_full_layout(), name, **kwargs)
set_reset_less(self.first)
set_reset_less(self.last)
set_reset_less(self.payload)
set_reset_less(self.param)
def __getattr__(self, name): def __getattr__(self, name):
try: try:
@ -136,8 +146,8 @@ class PipelinedActor(BinaryActor):
first = sink.valid & sink.first first = sink.valid & sink.first
last = sink.valid & sink.last last = sink.valid & sink.last
for i in range(latency): for i in range(latency):
first_n = Signal() first_n = Signal(reset_less=True)
last_n = Signal() last_n = Signal(reset_less=True)
self.sync += \ self.sync += \
If(self.pipe_ce, If(self.pipe_ce,
first_n.eq(first), first_n.eq(first),
@ -482,7 +492,7 @@ def inc_mod(s, m):
class Gearbox(Module): class Gearbox(Module):
def __init__(self, i_dw, o_dw, msb_first=True): def __init__(self, i_dw, o_dw, msb_first=True):
self.sink = sink = Endpoint([("data", i_dw)]) self.sink = sink = Endpoint([("data", i_dw)])
self.source = source = Endpoint([("data", o_dw)]) self.source = source = Endpoint([("data", o_dw)])
# # # # # #
@ -515,7 +525,7 @@ class Gearbox(Module):
# Data path # Data path
shift_register = Signal(io_lcm) shift_register = Signal(io_lcm, reset_less=True)
i_cases = {} i_cases = {}
i_data = Signal(i_dw) i_data = Signal(i_dw)