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downconn GW: fix tx not sending comma for long pak

This commit is contained in:
morgan 2024-09-24 13:43:26 +08:00
parent 26500e620c
commit 472e98be34
1 changed files with 17 additions and 5 deletions
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22
src/gateware/cxp_downconn.py
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@ -106,7 +106,7 @@ class CXP_DownConn_PHY(Module, AutoCSR):
# DEBUG: remove cdc fifo
# gtx rx -> fifo out -> cdc out
fifo_out = stream.AsyncFIFO(downconn_layout, 128)
fifo_out = stream.AsyncFIFO(downconn_layout, 512)
self.submodules += ClockDomainsRenamer({"write": "cxp_gtx_rx", "read": "sys"})(fifo_out)
self.sources.append(fifo_out)
@ -165,7 +165,7 @@ class CXP_DownConn_PHY(Module, AutoCSR):
# DEBUG: datain
# fw -> fifo (sys) -> cdc fifo -> gtx tx
fifo_in = stream.AsyncFIFO(downconn_layout, 128)
fifo_in = stream.AsyncFIFO(downconn_layout, 512)
self.submodules += ClockDomainsRenamer({"write": "sys", "read": "cxp_gtx_tx"})(fifo_in)
self.sinks.append(fifo_in)
@ -173,16 +173,28 @@ class CXP_DownConn_PHY(Module, AutoCSR):
txstb = Signal()
self.specials += MultiReg(self.tx_stb.storage, txstb, odomain="cxp_gtx_tx")
word_count = Signal(max=100)
# JANK: fix the every 98th word got eaten
# cnt 97 98 99 0
# out fifo[97] IDLE IDLE fifo[99]
# ack 1 0 0 1
self.sync.cxp_gtx_tx += [
fifo_in.source.ack.eq(0),
If(fifo_in.source.stb & txstb,
fifo_in.source.ack.eq(1),
If(word_count == 99,
word_count.eq(word_count.reset),
).Else(
If(fifo_in.source.stb & txstb,
If(word_count != 98, fifo_in.source.ack.eq(1)),
word_count.eq(word_count + 1),
)
)
]
# NOTE: prevent the first word send twice due to stream stb delay
self.comb += [
If(fifo_in.source.stb & fifo_in.source.ack,
If((fifo_in.source.stb & fifo_in.source.ack & (word_count != 99)),
gtx.encoder.d[0].eq(fifo_in.source.data[:8]),
gtx.encoder.d[1].eq(fifo_in.source.data[8:16]),
gtx.encoder.d[2].eq(fifo_in.source.data[16:24]),