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eth: Add AXI stream 64-bit BASE-R Ethernet frame receiver module and testbench

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
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Alex Forencich
2025-02-07 16:27:27 -08:00
parent f0f2a25943
commit e3f047d735
5 changed files with 898 additions and 0 deletions
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// SPDX-License-Identifier: CERN-OHL-S-2.0
/*
Copyright (c) 2019-2025 FPGA Ninja, LLC
Authors:
- Alex Forencich
*/
`resetall
`timescale 1ns / 1ps
`default_nettype none
/*
* AXI4-Stream 10GBASE-R frame receiver (10GBASE-R in, AXI out)
*/
module taxi_axis_baser_rx_64 #
(
parameter DATA_W = 64,
parameter HDR_W = 2,
parameter logic PTP_TS_EN = 1'b0,
parameter logic PTP_TS_FMT_TOD = 1'b1,
parameter PTP_TS_W = PTP_TS_FMT_TOD ? 96 : 64
)
(
input wire logic clk,
input wire logic rst,
/*
* 10GBASE-R encoded input
*/
input wire logic [DATA_W-1:0] encoded_rx_data,
input wire logic [HDR_W-1:0] encoded_rx_hdr,
/*
* Receive interface (AXI stream)
*/
taxi_axis_if.src m_axis_rx,
/*
* PTP
*/
input wire logic [PTP_TS_W-1:0] ptp_ts,
/*
* Configuration
*/
input wire logic cfg_rx_enable,
/*
* Status
*/
output wire logic [1:0] start_packet,
output wire logic error_bad_frame,
output wire logic error_bad_fcs,
output wire logic rx_bad_block,
output wire logic rx_sequence_error
);
localparam KEEP_W = DATA_W/8;
localparam USER_W = (PTP_TS_EN ? PTP_TS_W : 0) + 1;
// check configuration
if (DATA_W != 64)
$fatal(0, "Error: Interface width must be 64 (instance %m)");
if (KEEP_W*8 != DATA_W)
$fatal(0, "Error: Interface requires byte (8-bit) granularity (instance %m)");
if (HDR_W != 2)
$fatal(0, "Error: HDR_W must be 2 (instance %m)");
if (m_axis_rx.DATA_W != DATA_W)
$fatal(0, "Error: Interface DATA_W parameter mismatch (instance %m)");
if (m_axis_rx.USER_W != USER_W)
$fatal(0, "Error: Interface USER_W parameter mismatch (instance %m)");
localparam [7:0]
ETH_PRE = 8'h55,
ETH_SFD = 8'hD5;
localparam [7:0]
XGMII_IDLE = 8'h07,
XGMII_START = 8'hfb,
XGMII_TERM = 8'hfd,
XGMII_ERROR = 8'hfe;
localparam [6:0]
CTRL_IDLE = 7'h00,
CTRL_LPI = 7'h06,
CTRL_ERROR = 7'h1e,
CTRL_RES_0 = 7'h2d,
CTRL_RES_1 = 7'h33,
CTRL_RES_2 = 7'h4b,
CTRL_RES_3 = 7'h55,
CTRL_RES_4 = 7'h66,
CTRL_RES_5 = 7'h78;
localparam [3:0]
O_SEQ_OS = 4'h0,
O_SIG_OS = 4'hf;
localparam [1:0]
SYNC_DATA = 2'b10,
SYNC_CTRL = 2'b01;
localparam [7:0]
BLOCK_TYPE_CTRL = 8'h1e, // C7 C6 C5 C4 C3 C2 C1 C0 BT
BLOCK_TYPE_OS_4 = 8'h2d, // D7 D6 D5 O4 C3 C2 C1 C0 BT
BLOCK_TYPE_START_4 = 8'h33, // D7 D6 D5 C3 C2 C1 C0 BT
BLOCK_TYPE_OS_START = 8'h66, // D7 D6 D5 O0 D3 D2 D1 BT
BLOCK_TYPE_OS_04 = 8'h55, // D7 D6 D5 O4 O0 D3 D2 D1 BT
BLOCK_TYPE_START_0 = 8'h78, // D7 D6 D5 D4 D3 D2 D1 BT
BLOCK_TYPE_OS_0 = 8'h4b, // C7 C6 C5 C4 O0 D3 D2 D1 BT
BLOCK_TYPE_TERM_0 = 8'h87, // C7 C6 C5 C4 C3 C2 C1 BT
BLOCK_TYPE_TERM_1 = 8'h99, // C7 C6 C5 C4 C3 C2 D0 BT
BLOCK_TYPE_TERM_2 = 8'haa, // C7 C6 C5 C4 C3 D1 D0 BT
BLOCK_TYPE_TERM_3 = 8'hb4, // C7 C6 C5 C4 D2 D1 D0 BT
BLOCK_TYPE_TERM_4 = 8'hcc, // C7 C6 C5 D3 D2 D1 D0 BT
BLOCK_TYPE_TERM_5 = 8'hd2, // C7 C6 D4 D3 D2 D1 D0 BT
BLOCK_TYPE_TERM_6 = 8'he1, // C7 D5 D4 D3 D2 D1 D0 BT
BLOCK_TYPE_TERM_7 = 8'hff; // D6 D5 D4 D3 D2 D1 D0 BT
localparam [3:0]
INPUT_TYPE_IDLE = 4'd0,
INPUT_TYPE_ERROR = 4'd1,
INPUT_TYPE_START_0 = 4'd2,
INPUT_TYPE_START_4 = 4'd3,
INPUT_TYPE_DATA = 4'd4,
INPUT_TYPE_TERM_0 = 4'd8,
INPUT_TYPE_TERM_1 = 4'd9,
INPUT_TYPE_TERM_2 = 4'd10,
INPUT_TYPE_TERM_3 = 4'd11,
INPUT_TYPE_TERM_4 = 4'd12,
INPUT_TYPE_TERM_5 = 4'd13,
INPUT_TYPE_TERM_6 = 4'd14,
INPUT_TYPE_TERM_7 = 4'd15;
localparam [1:0]
STATE_IDLE = 2'd0,
STATE_PAYLOAD = 2'd1,
STATE_LAST = 2'd2;
logic [1:0] state_reg = STATE_IDLE, state_next;
// datapath control signals
logic reset_crc;
logic lanes_swapped = 1'b0;
logic [31:0] swap_data = 32'd0;
logic delay_type_valid = 1'b0;
logic [3:0] delay_type = INPUT_TYPE_IDLE;
logic [DATA_W-1:0] input_data_d0 = '0;
logic [DATA_W-1:0] input_data_d1 = '0;
logic [3:0] input_type_d0 = INPUT_TYPE_IDLE;
logic [3:0] input_type_d1 = INPUT_TYPE_IDLE;
logic [DATA_W-1:0] m_axis_rx_tdata_reg = '0, m_axis_rx_tdata_next;
logic [KEEP_W-1:0] m_axis_rx_tkeep_reg = '0, m_axis_rx_tkeep_next;
logic m_axis_rx_tvalid_reg = 1'b0, m_axis_rx_tvalid_next;
logic m_axis_rx_tlast_reg = 1'b0, m_axis_rx_tlast_next;
logic m_axis_rx_tuser_reg = 1'b0, m_axis_rx_tuser_next;
logic [1:0] start_packet_reg = 2'b00;
logic error_bad_frame_reg = 1'b0, error_bad_frame_next;
logic error_bad_fcs_reg = 1'b0, error_bad_fcs_next;
logic rx_bad_block_reg = 1'b0;
logic rx_sequence_error_reg = 1'b0;
logic [PTP_TS_W-1:0] ptp_ts_reg = '0;
logic [PTP_TS_W-1:0] ptp_ts_out_reg = '0, ptp_ts_out_next;
logic [PTP_TS_W-1:0] ptp_ts_adj_reg = '0;
logic ptp_ts_borrow_reg = '0;
logic [31:0] crc_state = '1;
wire [31:0] crc_next;
wire [7:0] crc_valid;
logic [7:0] crc_valid_save;
assign crc_valid[7] = crc_next == ~32'h2144df1c;
assign crc_valid[6] = crc_next == ~32'hc622f71d;
assign crc_valid[5] = crc_next == ~32'hb1c2a1a3;
assign crc_valid[4] = crc_next == ~32'h9d6cdf7e;
assign crc_valid[3] = crc_next == ~32'h6522df69;
assign crc_valid[2] = crc_next == ~32'he60914ae;
assign crc_valid[1] = crc_next == ~32'he38a6876;
assign crc_valid[0] = crc_next == ~32'h6b87b1ec;
logic [4+16-1:0] last_ts_reg = '0;
logic [4+16-1:0] ts_inc_reg = '0;
assign m_axis_rx.tdata = m_axis_rx_tdata_reg;
assign m_axis_rx.tkeep = m_axis_rx_tkeep_reg;
assign m_axis_rx.tstrb = m_axis_rx.tkeep;
assign m_axis_rx.tvalid = m_axis_rx_tvalid_reg;
assign m_axis_rx.tlast = m_axis_rx_tlast_reg;
assign m_axis_rx.tid = '0;
assign m_axis_rx.tdest = '0;
assign m_axis_rx.tuser[0] = m_axis_rx_tuser_reg;
if (PTP_TS_EN) begin
assign m_axis_rx.tuser[1 +: PTP_TS_W] = ptp_ts_out_reg;
end
assign start_packet = start_packet_reg;
assign error_bad_frame = error_bad_frame_reg;
assign error_bad_fcs = error_bad_fcs_reg;
assign rx_bad_block = rx_bad_block_reg;
assign rx_sequence_error = rx_sequence_error_reg;
taxi_lfsr #(
.LFSR_W(32),
.LFSR_POLY(32'h4c11db7),
.LFSR_GALOIS(1),
.LFSR_FEED_FORWARD(0),
.REVERSE(1),
.DATA_W(64)
)
eth_crc (
.data_in(input_data_d0),
.state_in(crc_state),
.data_out(),
.state_out(crc_next)
);
// Mask input data
logic [DATA_W-1:0] encoded_rx_data_masked;
always_comb begin
// minimal checks of control info to simplify datapath logic, full checks performed later
encoded_rx_data_masked = encoded_rx_data;
if (encoded_rx_hdr[0] == 0) begin
// data
encoded_rx_data_masked = encoded_rx_data;
end else if (encoded_rx_data[7]) begin
// terminate
case (encoded_rx_data[6:4])
3'd0: encoded_rx_data_masked = 64'd0;
3'd1: encoded_rx_data_masked = {56'd0, encoded_rx_data[15:8]};
3'd2: encoded_rx_data_masked = {48'd0, encoded_rx_data[23:8]};
3'd3: encoded_rx_data_masked = {40'd0, encoded_rx_data[31:8]};
3'd4: encoded_rx_data_masked = {32'd0, encoded_rx_data[39:8]};
3'd5: encoded_rx_data_masked = {24'd0, encoded_rx_data[47:8]};
3'd6: encoded_rx_data_masked = {16'd0, encoded_rx_data[55:8]};
3'd7: encoded_rx_data_masked = {8'd0, encoded_rx_data[63:8]};
endcase
end else begin
// start, OS, etc.
encoded_rx_data_masked = encoded_rx_data;
end
end
always_comb begin
state_next = STATE_IDLE;
reset_crc = 1'b0;
m_axis_rx_tdata_next = input_data_d1;
m_axis_rx_tkeep_next = 8'd0;
m_axis_rx_tvalid_next = 1'b0;
m_axis_rx_tlast_next = 1'b0;
m_axis_rx_tuser_next = m_axis_rx_tuser_reg;
m_axis_rx_tuser_next = 1'b0;
ptp_ts_out_next = ptp_ts_out_reg;
error_bad_frame_next = 1'b0;
error_bad_fcs_next = 1'b0;
case (state_reg)
STATE_IDLE: begin
// idle state - wait for packet
reset_crc = 1'b1;
if (input_type_d1 == INPUT_TYPE_START_0 && cfg_rx_enable) begin
// start condition
reset_crc = 1'b0;
state_next = STATE_PAYLOAD;
end else begin
state_next = STATE_IDLE;
end
end
STATE_PAYLOAD: begin
// read payload
m_axis_rx_tdata_next = input_data_d1;
m_axis_rx_tkeep_next = 8'hff;
m_axis_rx_tvalid_next = 1'b1;
m_axis_rx_tlast_next = 1'b0;
m_axis_rx_tuser_next = 1'b0;
if (input_type_d0[3]) begin
// INPUT_TYPE_TERM_*
reset_crc = 1'b1;
end
if (PTP_TS_EN) begin
ptp_ts_out_next = (!PTP_TS_FMT_TOD || ptp_ts_borrow_reg) ? ptp_ts_reg : ptp_ts_adj_reg;
end
if (input_type_d0 == INPUT_TYPE_DATA) begin
state_next = STATE_PAYLOAD;
end else if (input_type_d0[3]) begin
// INPUT_TYPE_TERM_*
if (input_type_d0 <= INPUT_TYPE_TERM_4) begin
// end this cycle
case (input_type_d0)
INPUT_TYPE_TERM_0: m_axis_rx_tkeep_next = 8'b00001111;
INPUT_TYPE_TERM_1: m_axis_rx_tkeep_next = 8'b00011111;
INPUT_TYPE_TERM_2: m_axis_rx_tkeep_next = 8'b00111111;
INPUT_TYPE_TERM_3: m_axis_rx_tkeep_next = 8'b01111111;
INPUT_TYPE_TERM_4: m_axis_rx_tkeep_next = 8'b11111111;
default: m_axis_rx_tkeep_next = 8'b11111111;
endcase
m_axis_rx_tlast_next = 1'b1;
if ((input_type_d0 == INPUT_TYPE_TERM_0 && crc_valid_save[7]) ||
(input_type_d0 == INPUT_TYPE_TERM_1 && crc_valid[0]) ||
(input_type_d0 == INPUT_TYPE_TERM_2 && crc_valid[1]) ||
(input_type_d0 == INPUT_TYPE_TERM_3 && crc_valid[2]) ||
(input_type_d0 == INPUT_TYPE_TERM_4 && crc_valid[3])) begin
// CRC valid
end else begin
m_axis_rx_tuser_next = 1'b1;
error_bad_frame_next = 1'b1;
error_bad_fcs_next = 1'b1;
end
state_next = STATE_IDLE;
end else begin
// need extra cycle
state_next = STATE_LAST;
end
end else begin
// control or error characters in packet
m_axis_rx_tlast_next = 1'b1;
m_axis_rx_tuser_next = 1'b1;
error_bad_frame_next = 1'b1;
reset_crc = 1'b1;
state_next = STATE_IDLE;
end
end
STATE_LAST: begin
// last cycle of packet
m_axis_rx_tdata_next = input_data_d1;
m_axis_rx_tkeep_next = 8'hff;
m_axis_rx_tvalid_next = 1'b1;
m_axis_rx_tlast_next = 1'b1;
m_axis_rx_tuser_next = 1'b0;
reset_crc = 1'b1;
case (input_type_d1)
INPUT_TYPE_TERM_5: m_axis_rx_tkeep_next = 8'b00000001;
INPUT_TYPE_TERM_6: m_axis_rx_tkeep_next = 8'b00000011;
INPUT_TYPE_TERM_7: m_axis_rx_tkeep_next = 8'b00000111;
default: m_axis_rx_tkeep_next = 8'b00000111;
endcase
if ((input_type_d1 == INPUT_TYPE_TERM_5 && crc_valid_save[4]) ||
(input_type_d1 == INPUT_TYPE_TERM_6 && crc_valid_save[5]) ||
(input_type_d1 == INPUT_TYPE_TERM_7 && crc_valid_save[6])) begin
// CRC valid
end else begin
m_axis_rx_tuser_next = 1'b1;
error_bad_frame_next = 1'b1;
error_bad_fcs_next = 1'b1;
end
state_next = STATE_IDLE;
end
default: begin
// invalid state, return to idle
state_next = STATE_IDLE;
end
endcase
end
always_ff @(posedge clk) begin
state_reg <= state_next;
m_axis_rx_tdata_reg <= m_axis_rx_tdata_next;
m_axis_rx_tkeep_reg <= m_axis_rx_tkeep_next;
m_axis_rx_tvalid_reg <= m_axis_rx_tvalid_next;
m_axis_rx_tlast_reg <= m_axis_rx_tlast_next;
m_axis_rx_tuser_reg <= m_axis_rx_tuser_next;
ptp_ts_out_reg <= ptp_ts_out_next;
start_packet_reg <= 2'b00;
error_bad_frame_reg <= error_bad_frame_next;
error_bad_fcs_reg <= error_bad_fcs_next;
rx_bad_block_reg <= 1'b0;
rx_sequence_error_reg <= 1'b0;
delay_type_valid <= 1'b0;
swap_data <= encoded_rx_data_masked[63:32];
if (PTP_TS_EN && PTP_TS_FMT_TOD) begin
// ns field rollover
ptp_ts_adj_reg[15:0] <= ptp_ts_reg[15:0];
{ptp_ts_borrow_reg, ptp_ts_adj_reg[45:16]} <= $signed({1'b0, ptp_ts_reg[45:16]}) - $signed(31'd1000000000);
ptp_ts_adj_reg[47:46] <= 0;
ptp_ts_adj_reg[95:48] <= ptp_ts_reg[95:48] + 1;
end
if (encoded_rx_hdr == SYNC_CTRL && encoded_rx_data[7:0] == BLOCK_TYPE_START_0) begin
lanes_swapped <= 1'b0;
input_type_d0 <= INPUT_TYPE_START_0;
input_data_d0 <= encoded_rx_data_masked;
end else if (encoded_rx_hdr == SYNC_CTRL && (encoded_rx_data[7:0] == BLOCK_TYPE_START_4 || encoded_rx_data[7:0] == BLOCK_TYPE_OS_START)) begin
lanes_swapped <= 1'b1;
delay_type_valid <= 1'b1;
if (delay_type_valid) begin
input_type_d0 <= delay_type;
end else begin
input_type_d0 <= INPUT_TYPE_IDLE;
end
input_data_d0 <= {encoded_rx_data_masked[31:0], swap_data};
end else if (lanes_swapped) begin
if (delay_type_valid) begin
input_type_d0 <= delay_type;
end else if (encoded_rx_hdr == SYNC_DATA) begin
input_type_d0 <= INPUT_TYPE_DATA;
end else if (encoded_rx_hdr == SYNC_CTRL) begin
case (encoded_rx_data[7:0])
BLOCK_TYPE_TERM_0: input_type_d0 <= INPUT_TYPE_TERM_4;
BLOCK_TYPE_TERM_1: input_type_d0 <= INPUT_TYPE_TERM_5;
BLOCK_TYPE_TERM_2: input_type_d0 <= INPUT_TYPE_TERM_6;
BLOCK_TYPE_TERM_3: input_type_d0 <= INPUT_TYPE_TERM_7;
BLOCK_TYPE_TERM_4: begin
delay_type_valid <= 1'b1;
input_type_d0 <= INPUT_TYPE_DATA;
end
BLOCK_TYPE_TERM_5: begin
delay_type_valid <= 1'b1;
input_type_d0 <= INPUT_TYPE_DATA;
end
BLOCK_TYPE_TERM_6: begin
delay_type_valid <= 1'b1;
input_type_d0 <= INPUT_TYPE_DATA;
end
BLOCK_TYPE_TERM_7: begin
delay_type_valid <= 1'b1;
input_type_d0 <= INPUT_TYPE_DATA;
end
default: begin
rx_bad_block_reg <= 1'b1;
input_type_d0 <= INPUT_TYPE_ERROR;
end
endcase
end else begin
rx_bad_block_reg <= 1'b1;
input_type_d0 <= INPUT_TYPE_ERROR;
end
if (delay_type_valid) begin
// mask off trailing data
input_data_d0 <= {32'd0, swap_data};
end else begin
input_data_d0 <= {encoded_rx_data_masked[31:0], swap_data};
end
end else begin
if (encoded_rx_hdr == SYNC_DATA) begin
input_type_d0 <= INPUT_TYPE_DATA;
end else if (encoded_rx_hdr == SYNC_CTRL) begin
case (encoded_rx_data[7:0])
BLOCK_TYPE_TERM_0: input_type_d0 <= INPUT_TYPE_TERM_0;
BLOCK_TYPE_TERM_1: input_type_d0 <= INPUT_TYPE_TERM_1;
BLOCK_TYPE_TERM_2: input_type_d0 <= INPUT_TYPE_TERM_2;
BLOCK_TYPE_TERM_3: input_type_d0 <= INPUT_TYPE_TERM_3;
BLOCK_TYPE_TERM_4: input_type_d0 <= INPUT_TYPE_TERM_4;
BLOCK_TYPE_TERM_5: input_type_d0 <= INPUT_TYPE_TERM_5;
BLOCK_TYPE_TERM_6: input_type_d0 <= INPUT_TYPE_TERM_6;
BLOCK_TYPE_TERM_7: input_type_d0 <= INPUT_TYPE_TERM_7;
default: begin
rx_bad_block_reg <= 1'b1;
input_type_d0 <= INPUT_TYPE_ERROR;
end
endcase
end else begin
rx_bad_block_reg <= 1'b1;
input_type_d0 <= INPUT_TYPE_ERROR;
end
input_data_d0 <= encoded_rx_data_masked;
end
if (encoded_rx_hdr == SYNC_DATA) begin
delay_type <= INPUT_TYPE_DATA;
end else if (encoded_rx_hdr == SYNC_CTRL) begin
case (encoded_rx_data[7:0])
BLOCK_TYPE_START_4: delay_type <= INPUT_TYPE_START_0;
BLOCK_TYPE_TERM_0: delay_type <= INPUT_TYPE_TERM_4;
BLOCK_TYPE_TERM_1: delay_type <= INPUT_TYPE_TERM_5;
BLOCK_TYPE_TERM_2: delay_type <= INPUT_TYPE_TERM_6;
BLOCK_TYPE_TERM_3: delay_type <= INPUT_TYPE_TERM_7;
BLOCK_TYPE_TERM_4: delay_type <= INPUT_TYPE_TERM_0;
BLOCK_TYPE_TERM_5: delay_type <= INPUT_TYPE_TERM_1;
BLOCK_TYPE_TERM_6: delay_type <= INPUT_TYPE_TERM_2;
BLOCK_TYPE_TERM_7: delay_type <= INPUT_TYPE_TERM_3;
default: delay_type <= INPUT_TYPE_ERROR;
endcase
end else begin
delay_type <= INPUT_TYPE_ERROR;
end
if (delay_type == INPUT_TYPE_START_0 && delay_type_valid) begin
start_packet_reg <= 2'b10;
if (PTP_TS_FMT_TOD) begin
ptp_ts_reg[45:0] <= ptp_ts[45:0] + 46'(ts_inc_reg >> 1);
ptp_ts_reg[95:48] <= ptp_ts[95:48];
end else begin
ptp_ts_reg <= ptp_ts + PTP_TS_W'(ts_inc_reg >> 1);
end
end
if (input_type_d0 == INPUT_TYPE_START_0) begin
if (!lanes_swapped) begin
start_packet_reg <= 2'b01;
ptp_ts_reg <= ptp_ts;
end
end
input_type_d1 <= input_type_d0;
input_data_d1 <= input_data_d0;
if (reset_crc) begin
crc_state <= '1;
end else begin
crc_state <= crc_next;
end
crc_valid_save <= crc_valid;
last_ts_reg <= (4+16)'(ptp_ts);
ts_inc_reg <= (4+16)'(ptp_ts) - last_ts_reg;
if (rst) begin
state_reg <= STATE_IDLE;
m_axis_rx_tvalid_reg <= 1'b0;
start_packet_reg <= 2'b00;
error_bad_frame_reg <= 1'b0;
error_bad_fcs_reg <= 1'b0;
rx_bad_block_reg <= 1'b0;
rx_sequence_error_reg <= 1'b0;
input_type_d0 <= INPUT_TYPE_IDLE;
input_type_d1 <= INPUT_TYPE_IDLE;
lanes_swapped <= 1'b0;
delay_type_valid <= 1'b0;
delay_type <= INPUT_TYPE_IDLE;
end
end
endmodule
`resetall