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fpga: x400: add register in 100G Eth TX path for timing

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Original-commit: 7e457a190cf37b48090aebcc715a07851cbda9d2
This commit is contained in:
Max Köhler
2024-08-30 13:23:29 -05:00
committed by Wade Fife
parent 82545838b2
commit 71c7b9044d
1 changed files with 18 additions and 7 deletions
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top/x400/ip/eth_100g_bd/eth_100g.sv
+18 -7
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@@ -101,8 +101,8 @@ module eth_100g #(
assert (mgt_tx.DATA_WIDTH == 512) else assert (mgt_tx.DATA_WIDTH == 512) else
$fatal(1, "mgt_rx.DATA_WIDTH must be 512"); $fatal(1, "mgt_rx.DATA_WIDTH must be 512");
// $clog2(512/8)+1 // $clog2(512/8)+1
assert (mgt_rx.USER_WIDTH == 7) else assert (mgt_tx.USER_WIDTH == 7) else
$fatal(1, "mgt_rx.USER_WIDTH must be 7"); $fatal(1, "mgt_tx.USER_WIDTH must be 7");
assert (mgt_tx.TDATA == 1) else assert (mgt_tx.TDATA == 1) else
$fatal(1, "mgt_tx.TDATA must be enabled"); $fatal(1, "mgt_tx.TDATA must be enabled");
assert (mgt_tx.TUSER == 1) else assert (mgt_tx.TUSER == 1) else
@@ -127,6 +127,17 @@ module eth_100g #(
end end
// synthesis translate_on // synthesis translate_on
// Add additional register to allow this path to allow placer to cover more distance on the FPGA
// die.
AxiStreamIf #(.DATA_WIDTH(mgt_tx.DATA_WIDTH), .USER_WIDTH(mgt_tx.USER_WIDTH))
mgt_tx_dly(mgt_clk,mgt_rst);
axi4s_fifo #(
.SIZE(1)
) mgt_tx_reg (
.clear(1'b0),.space(),.occupied(),
.i(mgt_tx), .o(mgt_tx_dly)
);
AxiStreamIf #(.DATA_WIDTH(512),.TUSER(0),.TKEEP(0)) AxiStreamIf #(.DATA_WIDTH(512),.TUSER(0),.TKEEP(0))
eth100g_tx(mgt_clk,mgt_rst); eth100g_tx(mgt_clk,mgt_rst);
AxiStreamIf #(.DATA_WIDTH(512),.USER_WIDTH(7),.TKEEP(0)) AxiStreamIf #(.DATA_WIDTH(512),.USER_WIDTH(7),.TKEEP(0))
@@ -136,12 +147,12 @@ module eth_100g #(
logic mgt_tx_pause; logic mgt_tx_pause;
always_comb begin always_comb begin
eth100g_tx.tdata = mgt_tx.tdata; eth100g_tx.tdata = mgt_tx_dly.tdata;
eth100g_tx.tuser = 0; eth100g_tx.tuser = 0;
eth100g_tx.tkeep = mgt_tx.tkeep; eth100g_tx.tkeep = mgt_tx_dly.tkeep;
eth100g_tx.tvalid = mgt_tx.tvalid && !mgt_tx_pause; eth100g_tx.tvalid = mgt_tx_dly.tvalid && !mgt_tx_pause;
eth100g_tx.tlast = mgt_tx.tlast; eth100g_tx.tlast = mgt_tx_dly.tlast;
mgt_tx.tready = eth100g_tx.tready && !mgt_tx_pause; mgt_tx_dly.tready = eth100g_tx.tready && !mgt_tx_pause;
end end
always_comb begin always_comb begin