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mac/crc: Add 64 bit support to inserter

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This commit is contained in:
David Sawatzke 2021-08-14 19:40:59 +02:00
parent fd827a545c
commit eeee9a1173
1 changed files with 18 additions and 4 deletions
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22
liteeth/mac/crc.py
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@ -173,7 +173,7 @@ class LiteEthMACCRCInserter(Module):
# # #
dw = len(sink.data)
assert dw in [8, 32]
assert dw in [8, 32, 64]
crc = crc_class(dw)
fsm = FSM(reset_state="IDLE")
self.submodules += crc, fsm
@ -203,14 +203,28 @@ class LiteEthMACCRCInserter(Module):
[If(sink.last_be[e],
source.data.eq(Cat(sink.data[:(e+1)*8],
crc.value)[:dw])) for e in range(dw//8)],
# If the whole crc value fits in the last sink paket, signal the
# end. This also means the next state is idle
If((dw == 64) & (sink.last_be <= 0xF),
source.last.eq(1),
source.last_be.eq(sink.last_be << (dw//8 - 4))
),
).Else(
crc.ce.eq(sink.valid & source.ready),
),
If(sink.valid & sink.last & source.ready,
NextValue(crc_packet, crc.value),
NextValue(last_be, sink.last_be),
NextState("CRC"),
If((dw == 64) & (sink.last_be <= 0xF),
NextState("IDLE"),
).Else(
NextValue(crc_packet, crc.value),
If(dw == 64,
NextValue(last_be, sink.last_be >> 4),
).Else (
NextValue(last_be, sink.last_be),
),
NextState("CRC"),
)
)
)
ratio = crc.width//dw