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Merge pull request #90 from david-sawatzke/dev/hybridmac_8bit 

mac/init: Add 32 & 64 bit support to hybrid mac (take two)
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enjoy-digital 2021-11-04 14:59:10 +01:00 committed by GitHub
parent b6c5e41097 3550f10fa3
commit 8ba5cf06a6
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1 changed files with 6 additions and 35 deletions
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41
liteeth/mac/__init__.py
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@ -69,7 +69,6 @@ class LiteEthMAC(Module, AutoCSR):
self.ev, self.bus = self.interface.sram.ev, self.interface.bus
self.csrs = self.interface.get_csrs() + self.core.get_csrs()
if interface == "hybrid":
assert dw == 8
# Hardware MAC
self.submodules.crossbar = LiteEthMACCrossbar(dw)
self.submodules.mac_crossbar = LiteEthMACCoreCrossbar(self.core, self.crossbar, self.interface, dw, hw_mac)
@ -87,39 +86,11 @@ class LiteEthMACCoreCrossbar(Module):
rx_ready = Signal()
rx_valid = Signal()
tx_pipe = []
rx_pipe = []
tx_last_be = last_be.LiteEthMACTXLastBE(dw)
rx_last_be = last_be.LiteEthMACRXLastBE(dw)
tx_pipe += [tx_last_be]
rx_pipe += [rx_last_be]
self.submodules += tx_last_be, rx_last_be
tx_converter = stream.StrideConverter(
description_from=eth_phy_description(32),
description_to=eth_phy_description(dw))
rx_converter = stream.StrideConverter(
description_from=eth_phy_description(dw),
description_to=eth_phy_description(32))
rx_pipe += [rx_converter]
tx_pipe += [tx_converter]
self.submodules += tx_converter, rx_converter
# CPU packet processing
self.submodules.tx_pipe = stream.Pipeline(*reversed(tx_pipe))
self.submodules.rx_pipe = stream.Pipeline(*rx_pipe)
# IP core packet processing
self.submodules.packetizer = LiteEthMACPacketizer(dw)
self.submodules.depacketizer = LiteEthMACDepacketizer(dw)
self.comb += [
# CPU output path
# interface -> tx_pipe
interface.source.connect(self.tx_pipe.sink),
# CPU input path
# rx_pipe -> interface
self.rx_pipe.source.connect(interface.sink),
# HW input path
# depacketizer -> crossbar
self.depacketizer.source.connect(crossbar.master.sink),
@ -144,7 +115,7 @@ class LiteEthMACCoreCrossbar(Module):
hw_fifo.source.connect(hw_packetizer.sink),
hw_packetizer.source.connect(self.depacketizer.sink),
cpu_fifo.source.connect(cpu_packetizer.sink),
cpu_packetizer.source.connect(self.rx_pipe.sink),
cpu_packetizer.source.connect(interface.sink),
]
# RX packetizer broadcast
@ -162,19 +133,19 @@ class LiteEthMACCoreCrossbar(Module):
else:
# RX broadcast
self.comb += [
rx_ready.eq(self.rx_pipe.sink.ready & self.depacketizer.sink.ready),
rx_ready.eq(interface.sink.ready & self.depacketizer.sink.ready),
rx_valid.eq(rx_ready & core.source.valid),
core.source.connect(self.rx_pipe.sink, omit={"ready", "valid"}),
core.source.connect(interface.sink, omit={"ready", "valid"}),
core.source.connect(self.depacketizer.sink, omit={"ready", "valid"}),
core.source.ready.eq(rx_ready),
self.rx_pipe.sink.valid.eq(rx_valid),
interface.sink.valid.eq(rx_valid),
self.depacketizer.sink.valid.eq(rx_valid),
]
# TX arbiter
self.submodules.tx_arbiter_fsm = fsm = FSM(reset_state="IDLE")
fsm.act("IDLE",
If(self.tx_pipe.source.valid,
If(interface.source.valid,
NextState("WISHBONE")
).Else(
If(self.packetizer.source.valid,
@ -183,7 +154,7 @@ class LiteEthMACCoreCrossbar(Module):
),
)
fsm.act("WISHBONE",
self.tx_pipe.source.connect(core.sink),
interface.source.connect(core.sink),
If(core.sink.valid & core.sink.ready & core.sink.last,
NextState("IDLE")
),