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phy: send 2 ALIGN primitives every 256 DWORDs

This commit is contained in:
Florent Kermarrec 2014-11-11 09:57:43 +01:00
parent 353e7fc13b
commit 30964db4a1
1 changed files with 21 additions and 4 deletions
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25
lib/sata/phy/k7sataphy/datapath.py
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@ -127,14 +127,31 @@ class K7SATAPHYDatapath(Module):
gtx.txcharisk.eq(tx.source.charisk),
]
# Align cnt (send 2 Align DWORDs every 256 DWORDs)
align_cnt = Signal(8)
self.sync += \
If(~ctrl.ready,
align_cnt.eq(0)
).Elsif(tx.sink.stb & tx.sink.ack,
align_cnt.eq(align_cnt+1)
)
send_align = (align_cnt < 2)
# user / ctrl mux
self.comb += [
# user
If(ctrl.ready,
tx.sink.stb.eq(self.sink.stb),
tx.sink.data.eq(self.sink.data),
tx.sink.charisk.eq(self.sink.charisk),
self.sink.ack.eq(tx.sink.ack),
If(send_align,
tx.sink.stb.eq(1),
tx.sink.data.eq(ALIGN_VAL),
tx.sink.charisk.eq(0b0001),
self.sink.ack.eq(0)
).Else(
tx.sink.stb.eq(self.sink.stb),
tx.sink.data.eq(self.sink.data),
tx.sink.charisk.eq(self.sink.charisk),
self.sink.ack.eq(tx.sink.ack)
)
self.source.stb.eq(rx.source.stb),
self.source.data.eq(rx.source.data),