From 407b4c9984229c1ab96ac78ab07411cb6e0cf034 Mon Sep 17 00:00:00 2001 From: morgan Date: Fri, 1 Nov 2024 15:24:58 +0800 Subject: [PATCH] sim GW: prototyping frame decoding pipeine sim: add double buffer sim: add eop marker for crc checker in double buffer sim: add KCode, pak type & CRC generator sim: add Stream crossbar sim: add stream pipeline with parser & buffer sim: add frame generator & image viewer --- sim_frame.py | 134 +++++++++++++++++++++++++++++++++++++++++ sim_frame_gen.py | 148 +++++++++++++++++++++++++++++++++++++++++++++ sim_generator.py | 120 ++++++++++++++++++++++++++++++++++++ sim_stream.py | 154 +++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 556 insertions(+) create mode 100644 sim_frame.py create mode 100644 sim_frame_gen.py create mode 100644 sim_generator.py create mode 100644 sim_stream.py diff --git a/sim_frame.py b/sim_frame.py new file mode 100644 index 0000000..a4c3220 --- /dev/null +++ b/sim_frame.py @@ -0,0 +1,134 @@ +from migen import * +from misoc.interconnect import stream + +from sim_generator import CXPCRC32Inserter +from sim_frame_gen import get_frame_packet + +from src.gateware.cxp_pipeline import * +from src.gateware.cxp_frame_pipeline import * + +import numpy as np +from PIL import Image + + +class Frame(Module): + def __init__(self): + # to construct correct crc and ack/stb signal + self.submodules.buffer = buffer = stream.SyncFIFO(word_layout, 32) + self.submodules.crc_inserter = crc_inserter = CXPCRC32Inserter() + self.submodules.dchar_decoder = dchar_decoder = Duplicated_Char_Decoder() + + # NOTE: eop is needed for crc to work correctly and RX_Bootstrap need to be followed by a EOP marker anyway + self.submodules.eop_marker = eop_marker = EOP_Marker() + + self.submodules.stream_pipe = stream_pipe = Stream_Pipeline() + + pipeline = [buffer, crc_inserter, dchar_decoder, eop_marker, stream_pipe] + for s, d in zip(pipeline, pipeline[1:]): + self.comb += s.source.connect(d.sink) + self.sink = pipeline[0].sink + self.source = pipeline[-1].source + + # no backpressure for sim + self.sync += self.source.ack.eq(1) + + +dut = Frame() + + +def check_case(packet=[]): + print("=================TEST========================") + + sink = dut.sink + stream_pipe = dut.stream_pipe + + for i, p in enumerate(packet): + yield sink.data.eq(p["data"]) + yield sink.k.eq(p["k"]) + yield sink.stb.eq(1) + if "eop" in p: + yield sink.eop.eq(1) + else: + yield sink.eop.eq(0) + + # check cycle result + yield + # source = dut.dchar_decoder.source + # source = dut.stream_pipe.frame_extractor.sink + source = dut.sink + # print( + # f"\nCYCLE#{i} : source char = {yield source.data:#X} k = {yield source.k:#X} stb = {yield source.stb} ack = {yield source.ack} eop = {yield source.eop}" + # ) + + # extra clk cycles + cyc = i + 1 + img = [] + line = -1 + total_pixel = 1000 + for i in range(cyc, cyc + total_pixel): + yield sink.data.eq(0) + yield sink.k.eq(0) + yield sink.stb.eq(0) + yield sink.eop.eq(0) + yield + # print( + # f"\nCYCLE#{i} : source char = {yield source.data:#X} k = {yield source.k:#X} stb = {yield source.stb} ack = {yield source.ack} eop = {yield source.eop}" + # ) + + frame_extractoer = dut.stream_pipe.frame_extractor + new_line = yield frame_extractoer.new_line + if new_line: + img.append([]) + line += 1 + + stb = yield frame_extractoer.source.stb + data = yield frame_extractoer.source.data + if stb: + # CXP use MSB + img[line].append(np.uint16(data & 0xFFFF)) + img[line].append(np.uint16(data >> 16)) + + # metadata = dut.stream_pipe.frame_extractor.metadata + # img_header_layout = [ + # "stream_id", + # "source_tag", + # "x_size", + # "x_offset", + # "y_size", + # "y_offset", + # "l_size", # number of data words per image line + # "pixel_format", + # "tap_geo", + # "flag", + # ] + # for name in img_header_layout: + # print(f"{name} = {yield getattr(metadata, name):#04X} ", end="") + # print() + Image.fromarray(np.array(img, dtype=np.uint8)).show() + assert True + + +def testbench(): + stream_id = 0x69 + packet_tag = 0 + frame_packet = get_frame_packet(stream_id) + packet = [ + {"data": Replicate(C(stream_id, char_width), 4), "k": Replicate(0, 4)}, + {"data": Replicate(C(packet_tag, char_width), 4), "k": Replicate(0, 4)}, + { + "data": Replicate(C(len(frame_packet), 2*char_width)[8:], 4), + "k": Replicate(0, 4), + }, + { + "data": Replicate(C(len(frame_packet), 2*char_width)[:8], 4), + "k": Replicate(0, 4), + }, + ] + packet += frame_packet + # NOTE: for crc inserter!!!! + packet[-1]["eop"] = 0 + + yield from check_case(packet) + + +run_simulation(dut, testbench(), vcd_name="sim-cxp.vcd") diff --git a/sim_frame_gen.py b/sim_frame_gen.py new file mode 100644 index 0000000..22b9491 --- /dev/null +++ b/sim_frame_gen.py @@ -0,0 +1,148 @@ +from migen import * +from misoc.interconnect import stream + +from src.gateware.cxp_pipeline import * +from src.gateware.cxp_frame_pipeline import * + +from PIL import Image +import numpy as np + + +def get_image_header( + stream_id, source_tag, xsize, xoffset, ysize, yoffset, dsize, pixelF, tag_geo, flag +): + stream_id = C(stream_id, char_width) + source_tag = C(source_tag, 2 * char_width) + xsize = C(xsize, 3 * char_width) + xoffset = C(xoffset, 3 * char_width) + ysize = C(ysize, 3 * char_width) + yoffset = C(yoffset, 3 * char_width) + dsize = C(dsize, 3 * char_width) + pixelF = C(pixelF, 2 * char_width) + tag_geo = C(tag_geo, 2 * char_width) + flag = C(flag, char_width) + + assert len(stream_id) == len(flag) == char_width + assert len(source_tag) == len(pixelF) == len(tag_geo) == 2 * char_width + assert len(xsize) == len(xoffset) == len(ysize) == len(yoffset) == 3 * char_width + return [ + {"data": Replicate(KCode["stream_marker"], 4), "k": Replicate(1, 4)}, + {"data": Replicate(C(0x01, char_width), 4), "k": Replicate(0, 4)}, + {"data": Replicate(stream_id, 4), "k": Replicate(0, 4)}, + {"data": Replicate(source_tag[8:], 4), "k": Replicate(0, 4)}, + {"data": Replicate(source_tag[:8], 4), "k": Replicate(0, 4)}, + {"data": Replicate(xsize[16:], 4), "k": Replicate(0, 4)}, + {"data": Replicate(xsize[8:16], 4), "k": Replicate(0, 4)}, + {"data": Replicate(xsize[:8], 4), "k": Replicate(0, 4)}, + {"data": Replicate(xoffset[16:], 4), "k": Replicate(0, 4)}, + {"data": Replicate(xoffset[8:16], 4), "k": Replicate(0, 4)}, + {"data": Replicate(xoffset[:8], 4), "k": Replicate(0, 4)}, + {"data": Replicate(ysize[16:], 4), "k": Replicate(0, 4)}, + {"data": Replicate(ysize[8:16], 4), "k": Replicate(0, 4)}, + {"data": Replicate(ysize[:8], 4), "k": Replicate(0, 4)}, + {"data": Replicate(yoffset[16:], 4), "k": Replicate(0, 4)}, + {"data": Replicate(yoffset[8:16], 4), "k": Replicate(0, 4)}, + {"data": Replicate(yoffset[:8], 4), "k": Replicate(0, 4)}, + {"data": Replicate(dsize[16:], 4), "k": Replicate(0, 4)}, + {"data": Replicate(dsize[8:16], 4), "k": Replicate(0, 4)}, + {"data": Replicate(dsize[:8], 4), "k": Replicate(0, 4)}, + {"data": Replicate(pixelF[8:], 4), "k": Replicate(0, 4)}, + {"data": Replicate(pixelF[:8], 4), "k": Replicate(0, 4)}, + {"data": Replicate(tag_geo[8:], 4), "k": Replicate(0, 4)}, + {"data": Replicate(tag_geo[:8], 4), "k": Replicate(0, 4)}, + {"data": Replicate(flag, 4), "k": Replicate(0, 4)}, + ] + + +def get_line_marker(): + return [ + {"data": Replicate(KCode["stream_marker"], 4), "k": Replicate(1, 4)}, + {"data": Replicate(C(0x02, char_width), 4), "k": Replicate(0, 4)}, + ] + + +def get_frame_packet(stream_id, pixel_format="mono16"): + assert pixel_format in ["mono16"] + + arr = [ + [204, 200, 203, 205, 190, 187, 189, 205, 214, 197, 188, 185, 181, 178, 193, 209, 211, 207, 211, 192, 168, 168, 171, 199, 210, 212, 203, 196], + [218, 205, 199, 190, 192, 197, 196, 195, 184, 178, 182, 173, 166, 132, 122, 114, 154, 184, 187, 188, 171, 168, 170, 180, 192, 196, 202, 198], + [223, 222, 222, 224, 216, 199, 199, 207, 205, 189, 183, 182, 144, 66, 61, 66, 80, 148, 181, 175, 169, 170, 174, 177, 196, 206, 223, 218], + [221, 226, 225, 222, 211, 200, 202, 208, 215, 201, 187, 180, 133, 116, 113, 118, 96, 111, 206, 193, 170, 169, 186, 211, 218, 224, 231, 223], + [219, 216, 206, 197, 210, 201, 206, 203, 191, 190, 185, 145, 134, 140, 159, 170, 150, 116, 180, 173, 179, 170, 172, 185, 201, 218, 227, 227], + [203, 198, 194, 208, 227, 201, 201, 201, 215, 221, 209, 170, 136, 113, 141, 139, 141, 145, 188, 170, 180, 169, 184, 173, 174, 192, 215, 230], + [206, 224, 213, 213, 233, 207, 204, 226, 233, 227, 214, 166, 145, 123, 145, 155, 147, 186, 213, 187, 171, 169, 193, 193, 171, 178, 186, 207], + [212, 228, 216, 205, 214, 205, 204, 230, 235, 225, 219, 187, 143, 122, 146, 163, 158, 195, 209, 203, 174, 168, 190, 185, 187, 202, 180, 174], + [197, 206, 201, 223, 213, 201, 203, 231, 234, 225, 218, 206, 147, 125, 149, 155, 190, 208, 206, 203, 175, 168, 171, 179, 184, 206, 189, 176], + [213, 202, 209, 235, 223, 200, 202, 202, 227, 227, 202, 176, 138, 122, 144, 153, 190, 209, 207, 191, 172, 167, 179, 204, 190, 191, 180, 193], + [225, 225, 207, 231, 219, 197, 215, 200, 194, 199, 181, 172, 131, 129, 147, 159, 113, 175, 196, 179, 184, 169, 181, 210, 202, 204, 200, 177], + [208, 222, 204, 223, 210, 191, 195, 198, 203, 167, 171, 168, 135, 129, 149, 175, 66, 57, 90, 121, 147, 165, 181, 205, 195, 217, 209, 173], + [188, 216, 201, 206, 199, 180, 185, 180, 129, 75, 139, 166, 124, 146, 189, 135, 51, 41, 38, 40, 45, 63, 131, 201, 189, 215, 193, 170], + [188, 194, 195, 192, 182, 180, 134, 68, 45, 41, 96, 130, 116, 156, 163, 64, 46, 41, 43, 41, 42, 42, 74, 181, 177, 198, 175, 193], + [179, 179, 209, 224, 198, 182, 99, 42, 44, 41, 44, 100, 116, 125, 100, 46, 45, 42, 42, 37, 44, 43, 49, 150, 183, 170, 172, 198], + [175, 177, 208, 223, 197, 180, 94, 40, 42, 40, 41, 99, 134, 117, 80, 43, 46, 43, 37, 37, 44, 42, 35, 129, 195, 170, 170, 180], + [179, 181, 187, 217, 193, 175, 91, 38, 41, 41, 42, 106, 151, 107, 62, 43, 45, 41, 33, 38, 42, 34, 33, 77, 188, 175, 173, 208], + [190, 191, 180, 213, 194, 175, 78, 38, 40, 40, 40, 98, 134, 97, 51, 44, 59, 50, 37, 40, 36, 26, 36, 44, 100, 178, 192, 206], + [199, 191, 184, 204, 196, 176, 78, 33, 38, 38, 39, 80, 102, 83, 43, 44, 112, 130, 122, 63, 33, 24, 29, 34, 33, 74, 162, 195], + [191, 170, 196, 193, 186, 177, 88, 27, 34, 37, 36, 74, 101, 70, 36, 37, 81, 127, 137, 113, 40, 28, 30, 32, 36, 29, 69, 173], + [164, 189, 190, 180, 176, 172, 83, 26, 28, 33, 32, 68, 97, 62, 32, 30, 44, 97, 123, 136, 58, 42, 44, 43, 43, 40, 58, 162], + [177, 202, 205, 181, 174, 163, 78, 38, 35, 47, 54, 67, 92, 51, 28, 29, 26, 21, 39, 85, 47, 46, 52, 47, 46, 45, 48, 141], + [181, 193, 199, 192, 171, 163, 91, 67, 121, 123, 91, 63, 89, 45, 25, 25, 23, 20, 15, 13, 20, 48, 54, 35, 34, 34, 68, 146], + [175, 192, 195, 179, 165, 163, 100, 64, 99, 94, 82, 58, 83, 37, 23, 22, 22, 27, 21, 15, 14, 44, 98, 83, 94, 118, 164, 157], + [153, 184, 171, 163, 161, 157, 140, 70, 58, 89, 61, 53, 76, 30, 20, 20, 20, 31, 24, 19, 16, 47, 159, 163, 160, 171, 160, 142], + [142, 150, 161, 168, 154, 154, 164, 138, 76, 55, 26, 37, 62, 24, 19, 19, 20, 21, 23, 27, 31, 46, 142, 156, 151, 153, 147, 145], + [153, 147, 174, 171, 151, 150, 169, 158, 142, 92, 28, 60, 59, 20, 20, 18, 20, 26, 27, 29, 33, 38, 125, 153, 150, 147, 147, 148], + [138, 141, 166, 164, 146, 144, 164, 149, 132, 72, 34, 88, 72, 24, 19, 18, 18, 23, 25, 28, 31, 30, 98, 150, 146, 144, 146, 144] + ] + source_tag = 0 + xsize, ysize = len(arr[0]), len(arr) + + xoffset, yoffset = 0, 0 + if pixel_format == "mono16": + dsize = xsize // 2 + pixelF = 0x0105 + tag_geo = 0 + flag = 0 + + packet = [] + # Image header + packet += get_image_header( + stream_id, + source_tag, + xsize, + xoffset, + ysize, + yoffset, + dsize, + pixelF, + tag_geo, + flag, + ) + + for line in arr: + packet += get_line_marker() + if pixel_format == "mono16": + for i in range(len(line)): + if (i % 2) == 0: + if i == len(line) - 1: + # print(C(line[i])) + packet += [ + { + "data": C(line[i], 4 * char_width), + "k": Replicate(0, 4), + }, + ] + else: + # print(C(line[i], 2 * char_width), C(line[i + 1])) + # CXP use MSB + packet += [ + { + "data": Cat( + C(line[i], 2 * char_width), + C(line[i + 1], 2 * char_width), + ), + "k": Replicate(0, 4), + }, + ] + + return packet diff --git a/sim_generator.py b/sim_generator.py new file mode 100644 index 0000000..b748eab --- /dev/null +++ b/sim_generator.py @@ -0,0 +1,120 @@ +from migen import * +from misoc.interconnect.csr import * +from misoc.interconnect import stream + +from src.gateware.cxp_frame_pipeline import CXPCRC32 +from src.gateware.cxp_pipeline import * + +class CXPCRC32Inserter(Module): + def __init__(self): + self.sink = stream.Endpoint(word_layout) + self.source = stream.Endpoint(word_layout) + + # # # + + self.submodules.crc = crc = CXPCRC32(word_dw) + self.submodules.fsm = fsm = FSM(reset_state="IDLE") + + fsm.act( + "IDLE", + crc.reset.eq(1), + self.sink.ack.eq(1), + If( + self.sink.stb, + self.sink.ack.eq(0), + NextState("COPY"), + ), + ) + fsm.act( + "COPY", + crc.ce.eq(self.sink.stb & self.source.ack), + crc.data.eq(self.sink.data), + self.sink.connect(self.source), + self.source.eop.eq(0), + If( + self.sink.stb & self.sink.eop & self.source.ack, + NextState("INSERT"), + ), + ) + fsm.act( + "INSERT", + self.source.stb.eq(1), + self.source.eop.eq(1), + self.source.data.eq(crc.value), + If(self.source.ack, NextState("IDLE")), + ) + + +class StreamPacket_Wrapper(Module): + def __init__(self): + self.sink = stream.Endpoint(word_layout) + self.source = stream.Endpoint(word_layout) + + # # # + + self.submodules.fsm = fsm = FSM(reset_state="IDLE") + + fsm.act( + "IDLE", + self.sink.ack.eq(1), + If( + self.sink.stb, + self.sink.ack.eq(0), + NextState("INSERT_HEADER_0"), + ), + ) + + fsm.act( + "INSERT_HEADER_0", + self.sink.ack.eq(0), + self.source.stb.eq(1), + self.source.data.eq(Replicate(KCode["pak_start"], 4)), + self.source.k.eq(Replicate(1, 4)), + If(self.source.ack, NextState("INSERT_HEADER_1")), + ) + + fsm.act( + "INSERT_HEADER_1", + self.sink.ack.eq(0), + self.source.stb.eq(1), + self.source.data.eq(Replicate(C(0x01, char_width), 4)), + self.source.k.eq(Replicate(0, 4)), + If(self.source.ack, NextState("COPY")), + ) + + fsm.act( + "COPY", + self.sink.connect(self.source), + self.source.eop.eq(0), + If( + self.sink.stb & self.sink.eop & self.source.ack, + NextState("INSERT_FOOTER"), + ), + ) + + fsm.act( + "INSERT_FOOTER", + self.sink.ack.eq(0), + self.source.stb.eq(1), + self.source.data.eq(Replicate(KCode["pak_end"], 4)), + self.source.k.eq(Replicate(1, 4)), + # Simulate RX don't have eop tagged + # self.source.eop.eq(1), + If(self.source.ack, NextState("IDLE")), + ) + + +# With KCode & 0x01*4 +class StreamData_Generator(Module): + def __init__(self): + # should be big enough for all test + self.submodules.buffer = buffer = stream.SyncFIFO(word_layout, 32) + self.submodules.crc_inserter = crc_inserter = CXPCRC32Inserter() + self.submodules.wrapper = wrapper = StreamPacket_Wrapper() + + # # # + pipeline = [buffer, crc_inserter, wrapper] + for s, d in zip(pipeline, pipeline[1:]): + self.comb += s.source.connect(d.sink) + self.sink = pipeline[0].sink + self.source = pipeline[-1].source diff --git a/sim_stream.py b/sim_stream.py new file mode 100644 index 0000000..326d9cd --- /dev/null +++ b/sim_stream.py @@ -0,0 +1,154 @@ +from migen import * +from misoc.interconnect import stream + +from sim_pipeline import * +from sim_generator import StreamData_Generator + +from src.gateware.cxp_pipeline import * + +class CXP_Links(Module): + def __init__(self): + # TODO: select the correct buffer to read from + # NOTE: although there are double buffer in each connect, the reading must be faster than writing to avoid data loss + + self.downconn_sources = [] + self.stream_sinks = [] + for i in range(2): + downconn = Pipeline() + setattr(self.submodules, "cxp_conn"+str(i), downconn) + self.downconn_sources.append(downconn) + + stream_pipeline = Stream_Pipeline() + setattr(self.submodules, "stream_pipeline"+str(i), stream_pipeline) + self.stream_sinks.append(stream_pipeline) + + self.submodules.crossbar = Streams_Crossbar(self.downconn_sources, self.stream_sinks) + +class Pipeline(Module): + def __init__(self): + self.submodules.generator = generator = StreamData_Generator() + self.submodules.dchar_decoder = dchar_decoder = Duplicated_Char_Decoder() + self.submodules.data_decoder = data_decoder = RX_Bootstrap() + self.submodules.eop_marker = eop_marker = EOP_Marker() + + # # # + + pipeline = [generator, dchar_decoder, data_decoder, eop_marker] + for s, d in zip(pipeline, pipeline[1:]): + self.comb += s.source.connect(d.sink) + self.sink = pipeline[0].sink + self.source = pipeline[-1].source + + # self.comb += self.source.ack.eq(1) + + +dut = CXP_Links() + +def check_case(packet=[]): + print("=================TEST========================") + + downconns = dut.downconn_sources + stream_buffers = dut.stream_sinks + ch = 0 + + for i, p in enumerate(packet): + for x in range(len(downconns)): + if x == ch: + yield downconns[x].sink.data.eq(p["data"]) + yield downconns[x].sink.k.eq(p["k"]) + yield downconns[x].sink.stb.eq(1) + else: + yield downconns[x].sink.data.eq(0) + yield downconns[x].sink.k.eq(0) + yield downconns[x].sink.stb.eq(0) + yield downconns[x].sink.eop.eq(0) + if "eop" in p: + yield downconns[ch].sink.eop.eq(1) + # compensate for delay + # yield + # yield downconns[ch].sink.data.eq(0) + # yield downconns[ch].sink.k.eq(0) + # yield downconns[ch].sink.stb.eq(0) + # yield downconns[ch].sink.eop.eq(0) + # yield + # yield + # yield + ch = (ch + 1) % len(downconns) + else: + yield downconns[ch].sink.eop.eq(0) + + # check cycle result + yield + # source = dut.stream_pipeline_sinks[0].source + source = dut.stream_sinks[0].double_buffer.source + print( + f"\nCYCLE#{i} : source char = {yield source.data:#X} k = {yield source.k:#X} stb = {yield source.stb} ack = {yield source.ack} eop = {yield source.eop}" + # f" source dchar = {yield source.dchar:#X} dchar_k = {yield source.dchar_k:#X}" + f"\nCYCLE#{i} : read mask = {yield dut.crossbar.mux.sel}" + # f"\nCYCLE#{i} : stream id = {yield decoder.stream_id:#X} pak_tag = {yield decoder.pak_tag:#X}" + # f" stream_pak_size = {yield decoder.stream_pak_size:#X}" + ) + # crc = downconns[1].generator.crc_inserter.crc + # crc = dut.double_buffer.crc + # print( + # f"CYCLE#{i} : crc error = {yield crc.error:#X} crc value = {yield crc.value:#X}" + # f" crc data = {yield crc.data:#X} engine next = {yield crc.engine.next:#X} ce = {yield crc.ce}" + # ) + + + # extra clk cycles + cyc = i + 1 + for i in range(cyc, cyc + 30): + for x in range(len(downconns)): + # yield won't reset every cycle + yield downconns[x].sink.data.eq(0) + yield downconns[x].sink.k.eq(0) + yield downconns[x].sink.stb.eq(0) + yield downconns[x].sink.eop.eq(0) + yield + print( + f"\nCYCLE#{i} : source char = {yield source.data:#X} k = {yield source.k:#X} stb = {yield source.stb} ack = {yield source.ack} eop = {yield source.eop}" + # f" source dchar = {yield source.dchar:#X} dchar_k = {yield source.dchar_k:#X}" + f"\nCYCLE#{i} : read mask = {yield dut.crossbar .mux.sel}" + # f"\nCYCLE#{i} : stream id = {yield decoder.stream_id:#X} pak_tag = {yield decoder.pak_tag:#X}" + # f" stream_pak_size = {yield decoder.stream_pak_size:#X}" + ) + assert True + + +def testbench(): + # stream_id = 0x01 + streams = [ + [ + {"data": 0x11111111, "k": Replicate(0, 4)}, + {"data": 0xB105F00D, "k": Replicate(0, 4)}, + ], + [ + {"data": 0x22222222, "k": Replicate(0, 4)}, + {"data": 0xC001BEA0, "k": Replicate(0, 4)}, + ], + [ + {"data": 0x33333333, "k": Replicate(0, 4)}, + {"data": 0xC0A79AE5, "k": Replicate(0, 4)}, + ], + ] + + packet = [] + for i, s in enumerate(streams): + s[-1]["eop"] = 0 + packet += [ + {"data": Replicate(C(i % 2, char_width), 4), "k": Replicate(0, 4)}, + {"data": Replicate(C(i, char_width), 4), "k": Replicate(0, 4)}, + { + "data": Replicate(C(len(s) >> 8 & 0xFF, char_width), 4), + "k": Replicate(0, 4), + }, + {"data": Replicate(C(len(s) & 0xFF, char_width), 4), "k": Replicate(0, 4)}, + *s, + ] + + + yield from check_case(packet) + + +run_simulation(dut, testbench(), vcd_name="sim-cxp.vcd")