usb-tools/amaranth
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

lib.fifo.AsyncFIFOBuffered: fix FFSynchronizer latency

Browse source
This commit is contained in:
Robin Ole Heinemann 2021-01-03 00:14:26 +01:00 • committed by whitequark
parent d15705cf4f
commit 2a7a3aef87
2 changed files with 5 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
nmigen/lib/fifo.py
View file

@ -513,7 +513,7 @@ class AsyncFIFOBuffered(Elaboratable, FIFOInterface):
m.d[self._r_domain] += self.r_level.eq(fifo.r_level + r_consume_buffered)
w_consume_buffered = Signal()
m.submodules.consume_buffered_cdc = FFSynchronizer(r_consume_buffered, w_consume_buffered, o_domain=self._w_domain)
m.submodules.consume_buffered_cdc = FFSynchronizer(r_consume_buffered, w_consume_buffered, o_domain=self._w_domain, stages=4)
m.d.comb += self.w_level.eq(fifo.w_level + w_consume_buffered)
with m.If(self.r_en | ~self.r_rdy):