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cxp: add PHY and pipeline 

testing: add loopback tx for rx testing
testing: add trigger, trigger ack for testing
cxp: add upconn & downconn phy
cxp: add upconn & downconn pipeline
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morgan 2024-06-14 17:17:56 +08:00
parent 12d8aed1d8
commit 9f80acd9ba
1 changed files with 399 additions and 0 deletions
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src/gateware/cxp.py Normal file
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from migen import *
from migen.genlib.cdc import MultiReg, PulseSynchronizer
from misoc.interconnect.csr import *
from cxp_downconn import CXP_DownConn_PHYS
from cxp_upconn import CXP_UpConn_PHYS
from cxp_pipeline import *
class CXP_PHYS(Module, AutoCSR):
def __init__(self, refclk, upconn_pads, downconn_pads, sys_clk_freq, debug_sma, pmod_pads):
assert len(upconn_pads) == len(downconn_pads)
self.submodules.upconn = CXP_UpConn_PHYS(upconn_pads, sys_clk_freq, debug_sma, pmod_pads)
self.submodules.downconn = CXP_DownConn_PHYS(refclk, downconn_pads, sys_clk_freq, debug_sma, pmod_pads)
@FullMemoryWE()
class CXP_Interface(Module, AutoCSR):
def __init__(self, upconn_phy, downconn_phy, debug_sma, pmod_pads):
# TODO: move all transceiver csr into a transceiver interface submodule
self.submodules.upconn = UpConn_Interface(upconn_phy, debug_sma, pmod_pads)
self.submodules.downconn = DownConn_Interface(downconn_phy, debug_sma, pmod_pads)
def get_tx_port(self):
return self.upconn.command.mem.get_port(write_capable=True)
def get_tx_mem_size(self):
return self.upconn.command.mem.depth*self.upconn.command.mem.width
def get_rx_port(self):
return self.downconn.packet_decoder.mem.get_port(write_capable=False)
def get_rx_mem_size(self):
return self.downconn.packet_decoder.mem.depth*self.downconn.packet_decoder.mem.width
def get_loopback_tx_port(self):
return self.downconn.command.mem.get_port(write_capable=True)
def get_loopback_tx_mem_size(self):
return self.downconn.command.mem.depth*self.downconn.command.mem.width
class DownConn_Interface(Module, AutoCSR):
def __init__(self, phy, debug_sma, pmod_pads):
self.rx_start_init = CSRStorage()
self.rx_restart = CSR()
self.rx_ready = CSRStatus()
# # #
gtx = phy.gtx
# GTX Control
self.sync += [
gtx.rx_restart.eq(self.rx_restart.re),
gtx.rx_init.clk_path_ready.eq(self.rx_start_init.storage),
self.rx_ready.status.eq(gtx.rx_ready),
]
# DEBUG: tx control
self.tx_start_init = CSRStorage()
self.tx_restart = CSR()
self.txenable = CSRStorage()
self.sync += [
gtx.txenable.eq(self.txenable.storage),
gtx.tx_restart.eq(self.tx_restart.re),
gtx.tx_init.clk_path_ready.eq(self.tx_start_init.storage),
]
# DEBUG: loopback control
self.loopback_mode = CSRStorage(3)
self.comb += gtx.loopback_mode.eq(self.loopback_mode.storage)
# DEBUG: init status
self.txinit_phaligndone = CSRStatus()
self.rxinit_phaligndone = CSRStatus()
self.comb += [
self.txinit_phaligndone.status.eq(gtx.tx_init.Xxphaligndone),
self.rxinit_phaligndone.status.eq(gtx.rx_init.Xxphaligndone),
]
# Connect all GTX connections' DRP
self.gtx_daddr = CSRStorage(9)
self.gtx_dread = CSR()
self.gtx_din_stb = CSR()
self.gtx_din = CSRStorage(16)
self.gtx_dout = CSRStatus(16)
self.gtx_dready = CSR()
self.comb += gtx.dclk.eq(ClockSignal("sys"))
self.sync += [
gtx.den.eq(0),
gtx.dwen.eq(0),
If(self.gtx_dread.re,
gtx.den.eq(1),
gtx.daddr.eq(self.gtx_daddr.storage),
).Elif(self.gtx_din_stb.re,
gtx.den.eq(1),
gtx.dwen.eq(1),
gtx.daddr.eq(self.gtx_daddr.storage),
gtx.din.eq(self.gtx_din.storage),
),
If(gtx.dready,
self.gtx_dready.w.eq(1),
self.gtx_dout.status.eq(gtx.dout),
),
If(self.gtx_dready.re,
self.gtx_dready.w.eq(0),
),
]
# DEBUG: txusrclk PLL DRP
self.txpll_reset = CSRStorage()
self.pll_daddr = CSRStorage(7)
self.pll_dclk = CSRStorage()
self.pll_den = CSRStorage()
self.pll_din = CSRStorage(16)
self.pll_dwen = CSRStorage()
self.txpll_locked = CSRStatus()
self.pll_dout = CSRStatus(16)
self.pll_dready = CSRStatus()
self.comb += [
gtx.txpll_reset.eq(self.txpll_reset.storage),
gtx.pll_daddr.eq(self.pll_daddr.storage),
gtx.pll_dclk.eq(self.pll_dclk.storage),
gtx.pll_den.eq(self.pll_den.storage),
gtx.pll_din.eq(self.pll_din.storage),
gtx.pll_dwen.eq(self.pll_dwen.storage),
self.txinit_phaligndone.status.eq(gtx.tx_init.Xxphaligndone),
self.rxinit_phaligndone.status.eq(gtx.rx_init.Xxphaligndone),
self.txpll_locked.status.eq(gtx.txpll_locked),
self.pll_dout.status.eq(gtx.pll_dout),
self.pll_dready.status.eq(gtx.pll_dready),
]
# DEBUG: tx loopback fifo control
self.tx_stb = CSRStorage()
self.sync += phy.tx_stb_sys.eq(self.tx_stb.storage)
# DEBUG: Transmission Pipeline
#
# test pak ----+
# from gw | 32 32
# |---/---> mux -----> packet -----> trigger ack ---/---> PHY
# | wrapper inserter
# data pak ----+
# from fw
# DEBUG: TX pipeline
self.submodules.command = command = TX_Command_Packet()
self.submodules.testseq = testseq = TX_Test_Packet()
self.submodules.mux = mux = stream.Multiplexer(word_layout, 2)
self.submodules.pak_wrp = pak_wrp = Packet_Wrapper()
self.submodules.trig_ack = trig_ack = Trigger_ACK_Inserter()
self.ack = CSR()
self.mux_sel = CSRStorage()
self.sync += trig_ack.stb.eq(self.ack.re),
self.comb += [
command.source.connect(mux.sink0),
testseq.source.connect(mux.sink1),
mux.sel.eq(self.mux_sel.storage),
]
tx_pipeline = [mux , pak_wrp, trig_ack, phy]
for s, d in zip(tx_pipeline, tx_pipeline[1:]):
self.comb += s.source.connect(d.sink)
# Receiver Pipeline WIP
#
# 32 32
# PHY ---/---> CDC FIFO ---/---> trigger ack ------> packet ------> debug buffer
# checker decoder
#
cdr = ClockDomainsRenamer("cxp_gtx_rx")
# Priority level 1 packet - Trigger ack packet
self.submodules.trig_ack_checker = trig_ack_checker = cdr(CXP_Trig_Ack_Checker())
self.submodules.trig_ack_ps = trig_ack_ps = PulseSynchronizer("cxp_gtx_rx", "sys")
self.comb += trig_ack_ps.i.eq(trig_ack_checker.ack)
self.trig_ack = Signal()
self.trig_clr = Signal()
# Error are latched
self.sync += [
If(trig_ack_ps.o,
self.trig_ack.eq(1),
).Elif(self.trig_clr,
self.trig_ack.eq(0),
),
]
# Priority level 2 packet - data, test packet
self.submodules.packet_decoder = packet_decoder = cdr(CXP_Data_Packet_Decode())
self.decoder_error = CSR()
self.test_error = CSR()
self.buffer_error = CSR()
decode_err_ps = PulseSynchronizer("cxp_gtx_rx", "sys")
test_err_ps = PulseSynchronizer("cxp_gtx_rx", "sys")
buffer_err_ps = PulseSynchronizer("cxp_gtx_rx", "sys")
self.submodules += decode_err_ps, test_err_ps, buffer_err_ps
self.comb += [
decode_err_ps.i.eq(packet_decoder.decode_err),
test_err_ps.i.eq(packet_decoder.test_err),
buffer_err_ps.i.eq(packet_decoder.buffer_err),
]
self.sync += [
If(decode_err_ps.o,
self.decoder_error.w.eq(1),
).Elif(self.decoder_error.re,
self.decoder_error.w.eq(0),
),
If(test_err_ps.o,
self.test_error.w.eq(1),
).Elif(self.test_error.re,
self.test_error.w.eq(0),
),
If(buffer_err_ps.o,
self.buffer_error.w.eq(1),
).Elif(self.test_error.re,
self.buffer_error.w.eq(0),
),
]
# Cicular buffer interface
self.packet_type = CSRStatus(8)
self.pending_packet = CSR()
self.read_ptr = CSRStatus(log2_int(buffer_count))
self.specials += [
MultiReg(packet_decoder.packet_type, self.packet_type.status),
MultiReg(self.read_ptr.status, packet_decoder.read_ptr_rx, odomain="cxp_gtx_rx"),
]
self.sync += [
self.pending_packet.w.eq(self.read_ptr.status != packet_decoder.write_ptr_sys),
If(self.pending_packet.re & self.pending_packet.w,
self.read_ptr.status.eq(self.read_ptr.status + 1),
)
]
# DEBUG: remove this cdc fifo
cdc_fifo = stream.AsyncFIFO(word_layout, 512)
self.submodules += ClockDomainsRenamer({"write": "cxp_gtx_rx", "read": "sys"})(cdc_fifo)
self.submodules.debug_out = debug_out = RX_Debug_Buffer()
rx_pipeline = [phy, trig_ack_checker, packet_decoder, cdc_fifo, debug_out]
for s, d in zip(rx_pipeline, rx_pipeline[1:]):
self.comb += s.source.connect(d.sink)
# DEBUG: CSR
self.trigger_ack = CSR()
self.sync += [
self.trig_clr.eq(self.trigger_ack.re),
self.trigger_ack.w.eq(self.trig_ack),
]
pak_start = Signal()
self.sync += [
pak_start.eq(packet_decoder.sink.data == 0xFBFBFBFB),
]
self.specials += [
Instance("OBUF", i_I=phy.gtx.cd_cxp_gtx_rx.clk, o_O=debug_sma.p_tx),
# Instance("OBUF", i_I=, o_O=debug_sma.p_rx),
# # pmod 0-7 pin
Instance("OBUF", i_I=packet_decoder.test_err, o_O=pmod_pads[0]),
Instance("OBUF", i_I=pak_start, o_O=pmod_pads[1]),
# Instance("OBUF", i_I=fifo_in.source.ack, o_O=pmod_pads[2]),
# Instance("OBUF", i_I=gtx.comma_checker.aligner_en, o_O=pmod_pads[3]),
# Instance("OBUF", i_I=gtx.comma_checker.check_reset, o_O=pmod_pads[4]),
# Instance("OBUF", i_I=gtx.comma_checker.has_comma, o_O=pmod_pads[5]),
# Instance("OBUF", i_I=gtx.comma_checker.has_error, o_O=pmod_pads[6]),
# Instance("OBUF", i_I=gtx.comma_checker.ready_sys, o_O=pmod_pads[7]),
]
class UpConn_Interface(Module, AutoCSR):
def __init__(self, phy, debug_sma, pmod_pads):
self.clk_reset = CSRStorage(reset=1)
self.bitrate2x_enable = CSRStorage()
self.tx_enable = CSRStorage()
# TODO: add busy condition
self.tx_busy = CSRStatus()
self.tx_testmode_en = CSRStorage()
# # #
self.sync += [
phy.bitrate2x_enable.eq(self.bitrate2x_enable.storage),
phy.tx_enable.eq(self.tx_enable.storage),
phy.clk_reset.eq(self.clk_reset.re),
]
# Transmission Pipeline
#
# test pak ----+
# from gw | 32 32 8
# |---/---> mux -----> packet -----> idle word -----> trigger ack ---/--> conv ---/---> trigger -----> PHY
# | wrapper inserter inserter inserter
# data pak ----+
# from fw
#
# Equivalent transmission priority:
# trigger > trigger ack > idle > test/data packet
# To maintain the trigger performance, idle word should not be inserted into trigger or trigger ack.
#
# In low speed CoaXpress, the higher priority packet can be inserted in two types of boundary
# Insertion @ char boundary: Trigger packets
# Insertion @ word boundary: Trigger ack & IDLE packets
# The 32 bit part of the pipeline handles the word boundary insertion while the 8 bit part handles the char boundary insertion
# Packet FIFOs with transmission priority
# 0: Trigger packet
self.submodules.trig = trig = TX_Trigger()
# # DEBUG: INPUT
self.trig_stb = CSR()
self.trig_delay = CSRStorage(8)
self.linktrigger = CSRStorage(2)
self.sync += [
trig.stb.eq(self.trig_stb.re),
trig.delay.eq(self.trig_delay.storage),
trig.linktrig_mode.eq(self.linktrigger.storage),
]
# 1: IO acknowledgment for trigger packet
self.submodules.trig_ack = trig_ack = Trigger_ACK_Inserter()
# DEBUG: INPUT
self.ack = CSR()
self.sync += trig_ack.stb.eq(self.ack.re),
# 2: All other packets (data & test packet)
# Control is not timing dependent, all the data packets are handled in firmware
self.submodules.command = command = TX_Command_Packet()
self.submodules.testseq = testseq = TX_Test_Packet()
self.submodules.mux = mux = stream.Multiplexer(word_layout, 2)
self.comb += [
command.source.connect(mux.sink0),
testseq.source.connect(mux.sink1),
mux.sel.eq(self.tx_testmode_en.storage),
]
self.submodules.pak_wrp = pak_wrp = Packet_Wrapper()
# IDLE Word
self.submodules.idle = idle = Idle_Word_Inserter()
# Section 9.2.5.1 (CXP-001-2021)
# IDLE should be transmitter every 10000 words
cnt = Signal(max=10000)
self.sync += [
idle.stb.eq(0),
If((~idle.sink.stb) | (cnt == 9999),
idle.stb.eq(1),
cnt.eq(cnt.reset),
).Else(
cnt.eq(cnt + 1),
),
]
self.submodules.converter = converter = stream.StrideConverter(word_layout, char_layout)
tx_pipeline = [mux, pak_wrp, idle, trig_ack, converter, trig, phy]
for s, d in zip(tx_pipeline, tx_pipeline[1:]):
self.comb += s.source.connect(d.sink)