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phy/rmii: Add with_refclk_ddr_ouptut parameter and minor cosmetic cleanups. 

Setting with_refclk_ddr_ouptut to False can allow use of RMII PHY on platforms
not supporting DDROutput.
This commit is contained in:
Florent Kermarrec 2023-05-24 19:18:53 +02:00
parent bbed8f1c95
commit a57178ac26
1 changed files with 32 additions and 19 deletions
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51
liteeth/phy/rmii.py
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@ -1,7 +1,7 @@
#
# This file is part of LiteEth.
#
# Copyright (c) 2015-2018 Florent Kermarrec <florent@enjoy-digital.fr>
# Copyright (c) 2015-2023 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
from migen import *
@ -25,16 +25,17 @@ class LiteEthPHYRMIITX(Module):
# # #
converter = stream.StrideConverter(converter_description(8),
converter_description(2))
self.submodules += converter
self.submodules.converter = converter = stream.StrideConverter(
description_from = converter_description(8),
description_to = converter_description(2),
)
self.comb += [
converter.sink.valid.eq(sink.valid),
converter.sink.data.eq(sink.data),
sink.ready.eq(converter.sink.ready),
converter.source.ready.eq(1)
]
pads.tx_en.reset_less = True
pads.tx_en.reset_less = True
pads.tx_data.reset_less = True
self.sync += [
pads.tx_en.eq(converter.source.valid),
@ -48,22 +49,24 @@ class LiteEthPHYRMIIRX(Module):
# # #
converter = stream.StrideConverter(converter_description(2),
converter_description(8))
converter = stream.StrideConverter(
description_from = converter_description(2),
description_to = converter_description(8),
)
converter = ResetInserter()(converter)
self.submodules += converter
self.submodules.converter = converter
converter_sink_valid = Signal()
converter_sink_data = Signal(2)
converter_sink_data = Signal(2)
self.specials += [
MultiReg(converter_sink_valid, converter.sink.valid, n=2),
MultiReg(converter_sink_data, converter.sink.data, n=2)
MultiReg(converter_sink_data, converter.sink.data, n=2)
]
crs_dv = Signal()
crs_dv = Signal()
crs_dv_d = Signal()
rx_data = Signal(2)
rx_data = Signal(2)
self.sync += [
crs_dv.eq(pads.crs_dv),
crs_dv_d.eq(crs_dv),
@ -83,7 +86,7 @@ class LiteEthPHYRMIIRX(Module):
fsm.act("RECEIVE",
converter_sink_valid.eq(1),
converter_sink_data.eq(rx_data),
# end of frame when 2 consecutives 0 on crs_dv
# End of frame when 2 consecutives 0 on crs_dv.
If(~(crs_dv | crs_dv_d),
converter.sink.last.eq(1),
NextState("IDLE")
@ -93,7 +96,9 @@ class LiteEthPHYRMIIRX(Module):
class LiteEthPHYRMIICRG(Module, AutoCSR):
def __init__(self, clock_pads, pads, refclk_cd, with_hw_init_reset):
def __init__(self, clock_pads, pads, refclk_cd,
with_hw_init_reset = True,
with_refclk_ddr_output = True):
self._reset = CSRStorage()
# # #
@ -114,7 +119,10 @@ class LiteEthPHYRMIICRG(Module, AutoCSR):
self.comb += self.cd_eth_tx.clk.eq(ClockSignal(refclk_cd))
# Drive clock_pads if provided.
if clock_pads is not None:
self.specials += DDROutput(0, 1, clock_pads.ref_clk, ClockSignal("eth_tx"))
if with_refclk_ddr_output:
self.specials += DDROutput(i1=0, i2=1, o=clock_pads.ref_clk, clk=ClockSignal("eth_tx"))
else:
self.comb += clock_pads.ref_clk.eq(~ClockSignal("eth_tx")) # CHEKCME: Keep Invert?
# Reset
self.reset = reset = Signal()
@ -135,10 +143,15 @@ class LiteEthPHYRMII(Module, AutoCSR):
dw = 8
tx_clk_freq = 50e6
rx_clk_freq = 50e6
def __init__(self, clock_pads, pads, refclk_cd="eth", with_hw_init_reset=True):
self.submodules.crg = LiteEthPHYRMIICRG(clock_pads, pads, refclk_cd, with_hw_init_reset)
self.submodules.tx = ClockDomainsRenamer("eth_tx")(LiteEthPHYRMIITX(pads))
self.submodules.rx = ClockDomainsRenamer("eth_rx")(LiteEthPHYRMIIRX(pads))
def __init__(self, clock_pads, pads, refclk_cd="eth",
with_hw_init_reset = True,
with_refclk_ddr_output = True):
self.submodules.crg = LiteEthPHYRMIICRG(clock_pads, pads, refclk_cd,
with_hw_init_reset = with_hw_init_reset,
with_refclk_ddr_output = with_refclk_ddr_output,
)
self.submodules.tx = ClockDomainsRenamer("eth_tx")(LiteEthPHYRMIITX(pads))
self.submodules.rx = ClockDomainsRenamer("eth_rx")(LiteEthPHYRMIIRX(pads))
self.sink, self.source = self.tx.sink, self.rx.source
if hasattr(pads, "mdc"):