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cxp GW: rename to cxp frame pipeline

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cxp GW: use roi pipeline

cxp GW: add register for cnt to imprve timinig
This commit is contained in:
morgan 2025-01-03 11:34:02 +08:00
parent 6309b4824e
commit 4b6f3eaa06
1 changed files with 44 additions and 30 deletions
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74
src/gateware/cxp.py
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@ -184,10 +184,16 @@ class DownConn_Interface(Module, AutoCSR):
self.submodules += test_reset_ps
self.sync += test_reset_ps.i.eq(self.bootstrap_test_counts_reset.re),
self.sync.cxp_gtx_rx += bootstrap.test_cnt_reset.eq(test_reset_ps.o),
test_err_cnt_r = Signal.like(bootstrap.test_err_cnt)
test_pak_cnt_r = Signal.like(bootstrap.test_pak_cnt)
self.sync.cxp_gtx_rx += [
bootstrap.test_cnt_reset.eq(test_reset_ps.o),
test_err_cnt_r.eq(bootstrap.test_err_cnt),
test_pak_cnt_r.eq(bootstrap.test_pak_cnt),
]
self.specials += [
MultiReg(bootstrap.test_err_cnt, self.bootstrap_test_error_counter.status),
MultiReg(bootstrap.test_pak_cnt, self.bootstrap_test_packet_counter.status),
MultiReg(test_err_cnt_r, self.bootstrap_test_error_counter.status),
MultiReg(test_pak_cnt_r, self.bootstrap_test_packet_counter.status),
]
# Cicular buffer interface
@ -286,9 +292,9 @@ class UpConn_Interface(Module, AutoCSR):
for s, d in zip(tx_pipeline, tx_pipeline[1:]):
self.comb += s.source.connect(d.sink)
class CXP_Frame_Buffer(Module, AutoCSR):
class CXP_Frame_Pipeline(Module, AutoCSR):
# optimal stream packet size is 2 KiB - Section 9.5.2 (CXP-001-2021)
def __init__(self, downconns, pmod_pads, packet_size=16384, n_buffer=2):
def __init__(self, downconns, pmod_pads, packet_size=16384, n_buffer=1):
n_downconn = len(downconns)
framebuffers = []
@ -302,33 +308,41 @@ class CXP_Frame_Buffer(Module, AutoCSR):
arr_csr.append(csr)
setattr(self, name, csr)
crc_checker = cdr(CXPCRC32_Checker())
# TODO: handle full buffer gracefully
# TODO: investigate why there is a heartbeat message in the middle of the frame with k27.7 code too???
# NOTE: sometimes there are 0xFBFBFBFB K=0b1111
# perhaps the buffer is full overflowing and doing strange stuff
# it should be mem block not "cycle buffer"
# self.submodules.dropper = dropper = cdr(DChar_Dropper())
buffer_cdc_fifo = cdr(Buffer(word_layout_dchar)) # to improve timing
cdc_fifo = stream.AsyncFIFO(word_layout_dchar, 2**log2_int(packet_size//word_dw))
self.submodules += crc_checker, buffer_cdc_fifo
self.submodules += ClockDomainsRenamer({"write": "cxp_gtx_rx", "read": "sys"})(cdc_fifo)
pipeline = [crc_checker, buffer_cdc_fifo, cdc_fifo]
for s, d in zip(pipeline, pipeline[1:]):
self.comb += s.source.connect(d.sink)
framebuffers.append(pipeline[0])
roi_pipeline = ROI_Pipeline()
self.submodules += roi_pipeline
framebuffers.append(roi_pipeline.pipeline[0])
# DEBUG:
if i == 0:
self.submodules.debug_out = debug_out = RX_Debug_Buffer(word_layout_dchar, 2**log2_int(packet_size//word_dw))
self.comb += pipeline[-1].source.connect(debug_out.sink)
else:
# remove any backpressure
self.comb += pipeline[-1].source.ack.eq(1)
# self.comb += roi_pipeline.pipeline[-1].source.ack.eq(1)
# crc_checker = cdr(CXPCRC32_Checker())
# # TODO: handle full buffer gracefully
# # TODO: investigate why there is a heartbeat message in the middle of the frame with k27.7 code too???
# # NOTE: sometimes there are 0xFBFBFBFB K=0b1111
# # perhaps the buffer is full overflowing and doing strange stuff
# # it should be mem block not "cycle buffer"
# # self.submodules.dropper = dropper = cdr(DChar_Dropper())
# buffer_cdc_fifo = cdr(Buffer(word_layout_dchar)) # to improve timing
# cdc_fifo = stream.AsyncFIFO(word_layout_dchar, 2**log2_int(packet_size//word_dw))
# self.submodules += crc_checker, buffer_cdc_fifo
# self.submodules += ClockDomainsRenamer({"write": "cxp_gtx_rx", "read": "sys"})(cdc_fifo)
# pipeline = [crc_checker, buffer_cdc_fifo, cdc_fifo]
# for s, d in zip(pipeline, pipeline[1:]):
# self.comb += s.source.connect(d.sink)
# framebuffers.append(pipeline[0])
# # DEBUG:
# if i == 0:
# self.submodules.debug_out = debug_out = RX_Debug_Buffer(word_layout_dchar, 2**log2_int(packet_size//word_dw))
# self.comb += pipeline[-1].source.connect(debug_out.sink)
# else:
# # remove any backpressure
# self.comb += pipeline[-1].source.ack.eq(1)
self.submodules.router = router = cdr(Frame_Packet_Router(downconns, framebuffers, packet_size, pmod_pads))