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frontend/etherbone: simplify LiteEthEtherboneRecordReceiver.

This commit is contained in:
Florent Kermarrec 2020-11-06 19:49:07 +01:00
parent d96fdfc5e5
commit 06242564f7
1 changed files with 8 additions and 16 deletions
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24
liteeth/frontend/etherbone.py
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@ -215,20 +215,12 @@ class LiteEthEtherboneRecordReceiver(Module):
base_addr_update = Signal()
self.sync += If(base_addr_update, base_addr.eq(fifo.source.data))
counter = Signal(max=512, reset_less=True)
counter_reset = Signal()
counter_ce = Signal()
self.sync += \
If(counter_reset,
counter.eq(0)
).Elif(counter_ce,
counter.eq(counter + 1)
)
count = Signal(max=512, reset_less=True)
self.submodules.fsm = fsm = FSM(reset_state="IDLE")
fsm.act("IDLE",
fifo.source.ready.eq(1),
counter_reset.eq(1),
NextValue(count, 0),
If(fifo.source.valid,
base_addr_update.eq(1),
If(fifo.source.wcount,
@ -240,15 +232,15 @@ class LiteEthEtherboneRecordReceiver(Module):
)
fsm.act("RECEIVE_WRITES",
source.valid.eq(fifo.source.valid),
source.last.eq(counter == fifo.source.wcount-1),
source.last.eq(count == fifo.source.wcount-1),
source.count.eq(fifo.source.wcount),
source.be.eq(fifo.source.byte_enable),
source.addr.eq(base_addr[2:] + counter),
source.addr.eq(base_addr[2:] + count),
source.we.eq(1),
source.data.eq(fifo.source.data),
fifo.source.ready.eq(source.ready),
If(source.valid & source.ready,
counter_ce.eq(1),
NextValue(count, count + 1),
If(source.last,
If(fifo.source.rcount,
NextState("RECEIVE_BASE_RET_ADDR")
@ -259,7 +251,7 @@ class LiteEthEtherboneRecordReceiver(Module):
)
)
fsm.act("RECEIVE_BASE_RET_ADDR",
counter_reset.eq(1),
NextValue(count, 0),
If(fifo.source.valid,
base_addr_update.eq(1),
NextState("RECEIVE_READS")
@ -267,13 +259,13 @@ class LiteEthEtherboneRecordReceiver(Module):
)
fsm.act("RECEIVE_READS",
source.valid.eq(fifo.source.valid),
source.last.eq(counter == fifo.source.rcount-1),
source.last.eq(count == fifo.source.rcount-1),
source.count.eq(fifo.source.rcount),
source.base_addr.eq(base_addr),
source.addr.eq(fifo.source.data[2:]),
fifo.source.ready.eq(source.ready),
If(source.valid & source.ready,
counter_ce.eq(1),
NextValue(count, count + 1),
If(source.last,
NextState("IDLE")
)