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eth: Fix bugs in 10G MAC RX related to short IFGs

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
This commit is contained in:
Alex Forencich
2025-03-26 23:03:57 -07:00
parent 75a3909c37
commit bec324dc03
5 changed files with 43 additions and 44 deletions
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34
rtl/eth/taxi_axis_xgmii_rx_64.sv
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@@ -326,6 +326,19 @@ always_ff @(posedge clk) begin
ptp_ts_adj_reg[95:48] <= ptp_ts_reg[95:48] + 1;
end
// start control character detection
if (xgmii_rxc[0] && xgmii_rxd[7:0] == XGMII_START) begin
lanes_swapped <= 1'b0;
xgmii_start_d0 <= 1'b1;
framing_error_reg <= xgmii_rxc[7:1] != 0;
end else if (xgmii_rxc[4] && xgmii_rxd[39:32] == XGMII_START) begin
lanes_swapped <= 1'b1;
xgmii_start_swap <= 1'b1;
framing_error_reg <= xgmii_rxc[7:5] != 0;
end
// lane swapping and termination character detection
if (lanes_swapped) begin
xgmii_rxd_d0 <= {xgmii_rxd_masked[31:0], swap_rxd};
@@ -340,7 +353,6 @@ always_ff @(posedge clk) begin
term_lane_reg <= 3'(i);
term_present_reg <= 1'b1;
framing_error_reg <= ({xgmii_rxc[3:0], swap_rxc} & ({CTRL_W{1'b1}} >> (CTRL_W-i))) != 0;
lanes_swapped <= 1'b0;
end
end
end else begin
@@ -356,30 +368,10 @@ always_ff @(posedge clk) begin
term_lane_reg <= 3'(i);
term_present_reg <= 1'b1;
framing_error_reg <= (xgmii_rxc & ({CTRL_W{1'b1}} >> (CTRL_W-i))) != 0;
lanes_swapped <= 1'b0;
end
end
end
// start control character detection
if (xgmii_rxc[0] && xgmii_rxd[7:0] == XGMII_START) begin
lanes_swapped <= 1'b0;
xgmii_start_d0 <= 1'b1;
term_lane_reg <= 0;
term_present_reg <= 1'b0;
framing_error_reg <= xgmii_rxc[7:1] != 0;
end else if (xgmii_rxc[4] && xgmii_rxd[39:32] == XGMII_START) begin
lanes_swapped <= 1'b1;
xgmii_start_swap <= 1'b1;
term_lane_reg <= 0;
term_present_reg <= 1'b0;
framing_error_reg <= xgmii_rxc[7:5] != 0;
end
// capture timestamps
if (xgmii_start_swap) begin
start_packet_reg <= 2'b10;