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eth: Capture TX tag on the first cylce of the packet

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
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Alex Forencich
2026-01-03 23:44:53 -08:00
parent 108fb10735
commit 4b3a4b4059
5 changed files with 18 additions and 7 deletions
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8
src/eth/rtl/taxi_axis_xgmii_tx_64.sv
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@@ -160,7 +160,7 @@ logic s_axis_tx_tready_reg = 1'b0, s_axis_tx_tready_next;
logic [PTP_TS_W-1:0] m_axis_tx_cpl_ts_reg = '0;
logic [PTP_TS_W-1:0] m_axis_tx_cpl_ts_adj_reg = '0;
logic [TX_TAG_W-1:0] m_axis_tx_cpl_tag_reg = '0;
logic [TX_TAG_W-1:0] m_axis_tx_cpl_tag_reg = '0, m_axis_tx_cpl_tag_next;
logic m_axis_tx_cpl_valid_reg = 1'b0;
logic m_axis_tx_cpl_valid_int_reg = 1'b0;
logic m_axis_tx_cpl_ts_borrow_reg = 1'b0;
@@ -355,6 +355,8 @@ always_comb begin
s_tdata_next = s_tdata_reg;
s_empty_next = s_empty_reg;
m_axis_tx_cpl_tag_next = m_axis_tx_cpl_tag_reg;
// XGMII idle
xgmii_txd_next = {CTRL_W{XGMII_IDLE}};
xgmii_txc_next = {CTRL_W{1'b1}};
@@ -448,6 +450,8 @@ always_comb begin
s_tdata_next = s_axis_tx_tdata_masked;
s_empty_next = keep2empty(s_axis_tx.tkeep);
m_axis_tx_cpl_tag_next = s_axis_tx.tid;
if (s_axis_tx.tvalid && s_axis_tx.tready) begin
// XGMII start, preamble, and SFD
xgmii_txd_next = {ETH_SFD, {6{ETH_PRE}}, XGMII_START};
@@ -708,6 +712,7 @@ always_ff @(posedge clk) begin
s_axis_tx_tready_reg <= s_axis_tx_tready_next;
m_axis_tx_cpl_tag_reg <= m_axis_tx_cpl_tag_next;
m_axis_tx_cpl_valid_reg <= 1'b0;
m_axis_tx_cpl_valid_int_reg <= 1'b0;
@@ -754,7 +759,6 @@ always_ff @(posedge clk) begin
end
start_packet_reg <= 2'b01;
end
m_axis_tx_cpl_tag_reg <= s_axis_tx.tid;
if (TX_CPL_CTRL_IN_TUSER) begin
if (PTP_TS_FMT_TOD) begin
m_axis_tx_cpl_valid_int_reg <= (s_axis_tx.tuser >> 1) == 0;