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eth: Use signal sync module for internal MAC pause handling

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
This commit is contained in:
Alex Forencich
2025-02-25 16:27:37 -08:00
parent 84fb93b5c3
commit 64c1cb1e39
7 changed files with 75 additions and 170 deletions
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68
rtl/eth/taxi_eth_mac_1g.sv
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@@ -283,56 +283,36 @@ if (MAC_CTRL_EN) begin : mac_ctrl
wire [MCF_PARAMS_SIZE*8-1:0] rx_mcf_params;
// terminate LFC pause requests from RX internally on TX side
wire tx_pause_req_int;
wire rx_lfc_ack_int;
wire tx_pause_req_int;
wire rx_lfc_ack_int;
reg tx_lfc_req_sync_reg_1 = 1'b0;
reg tx_lfc_req_sync_reg_2 = 1'b0;
reg tx_lfc_req_sync_reg_3 = 1'b0;
wire rx_lfc_req_sync;
always @(posedge rx_clk or posedge rx_rst) begin
if (rx_rst) begin
tx_lfc_req_sync_reg_1 <= 1'b0;
end else begin
tx_lfc_req_sync_reg_1 <= rx_lfc_req;
end
end
taxi_sync_signal #(
.WIDTH(1),
.N(2)
)
rx_lfc_req_sync_inst (
.clk(tx_clk),
.in(rx_lfc_req),
.out(rx_lfc_req_sync)
);
always @(posedge tx_clk or posedge tx_rst) begin
if (tx_rst) begin
tx_lfc_req_sync_reg_2 <= 1'b0;
tx_lfc_req_sync_reg_3 <= 1'b0;
end else begin
tx_lfc_req_sync_reg_2 <= tx_lfc_req_sync_reg_1;
tx_lfc_req_sync_reg_3 <= tx_lfc_req_sync_reg_2;
end
end
wire tx_pause_ack_sync;
reg rx_lfc_ack_sync_reg_1 = 1'b0;
reg rx_lfc_ack_sync_reg_2 = 1'b0;
reg rx_lfc_ack_sync_reg_3 = 1'b0;
taxi_sync_signal #(
.WIDTH(1),
.N(2)
)
tx_pause_ack_sync_inst (
.clk(rx_clk),
.in(tx_lfc_pause_en && tx_pause_ack),
.out(tx_pause_ack_sync)
);
always @(posedge tx_clk or posedge tx_rst) begin
if (tx_rst) begin
rx_lfc_ack_sync_reg_1 <= 1'b0;
end else begin
rx_lfc_ack_sync_reg_1 <= tx_lfc_pause_en ? tx_pause_ack : 0;
end
end
assign tx_pause_req_int = tx_pause_req || (tx_lfc_pause_en && rx_lfc_req_sync);
always @(posedge rx_clk or posedge rx_rst) begin
if (rx_rst) begin
rx_lfc_ack_sync_reg_2 <= 1'b0;
rx_lfc_ack_sync_reg_3 <= 1'b0;
end else begin
rx_lfc_ack_sync_reg_2 <= rx_lfc_ack_sync_reg_1;
rx_lfc_ack_sync_reg_3 <= rx_lfc_ack_sync_reg_2;
end
end
assign tx_pause_req_int = tx_pause_req || (tx_lfc_pause_en ? tx_lfc_req_sync_reg_3 : 0);
assign rx_lfc_ack_int = rx_lfc_ack || rx_lfc_ack_sync_reg_3;
assign rx_lfc_ack_int = rx_lfc_ack || tx_pause_ack_sync;
taxi_mac_ctrl_tx #(
.ID_W(s_axis_tx.ID_W),