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axis: Add TID_ROUTE parameter to taxi_axis_demux to faciliate routing replies by TID

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
This commit is contained in:
Alex Forencich
2026-03-03 16:14:32 -08:00
parent 4d8f0cfece
commit 8494e734a8
4 changed files with 44 additions and 13 deletions
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36
src/axis/rtl/taxi_axis_demux.sv
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@@ -1,7 +1,7 @@
// SPDX-License-Identifier: CERN-OHL-S-2.0
/*
Copyright (c) 2018-2025 FPGA Ninja, LLC
Copyright (c) 2018-2026 FPGA Ninja, LLC
Authors:
- Alex Forencich
@@ -19,6 +19,8 @@ module taxi_axis_demux #
(
// Number of AXI stream outputs
parameter M_COUNT = 4,
// route via tid
parameter logic TID_ROUTE = 1'b0,
// route via tdest
parameter logic TDEST_ROUTE = 1'b0
)
@@ -53,6 +55,8 @@ localparam logic LAST_EN = s_axis.LAST_EN && m_axis[0].LAST_EN;
localparam logic ID_EN = s_axis.ID_EN && m_axis[0].ID_EN;
localparam ID_W = s_axis.ID_W;
localparam logic DEST_EN = s_axis.DEST_EN && m_axis[0].DEST_EN;
localparam S_ID_W = s_axis.ID_W;
localparam M_ID_W = m_axis[0].ID_W;
localparam S_DEST_W = s_axis.DEST_W;
localparam M_DEST_W = m_axis[0].DEST_W;
localparam logic USER_EN = s_axis.USER_EN && m_axis[0].USER_EN;
@@ -61,6 +65,7 @@ localparam USER_W = s_axis.USER_W;
localparam CL_M_COUNT = $clog2(M_COUNT);
localparam M_DEST_W_INT = M_DEST_W > 0 ? M_DEST_W : 1;
localparam M_ID_W_INT = M_ID_W > 0 ? M_ID_W : 1;
// check configuration
if (m_axis[0].DATA_W != DATA_W)
@@ -69,6 +74,17 @@ if (m_axis[0].DATA_W != DATA_W)
if (KEEP_EN && m_axis[0].KEEP_W != KEEP_W)
$fatal(0, "Error: Interface KEEP_W parameter mismatch (instance %m)");
if (TID_ROUTE) begin
if (!ID_EN)
$fatal(0, "Error: TID_ROUTE set requires ID_EN set (instance %m)");
if (S_ID_W < CL_M_COUNT)
$fatal(0, "Error: S_ID_W too small for port count (instance %m)");
if (TDEST_ROUTE)
$fatal(0, "Error: Cannot enable both TID_ROUTE and TDEST_ROUTE (instance %m)");
end
if (TDEST_ROUTE) begin
if (!DEST_EN)
$fatal(0, "Error: TDEST_ROUTE set requires DEST_EN set (instance %m)");
@@ -90,7 +106,7 @@ logic [KEEP_W-1:0] m_axis_tstrb_int;
logic [M_COUNT-1:0] m_axis_tvalid_int;
logic m_axis_tready_int_reg = 1'b0;
logic m_axis_tlast_int;
logic [ID_W-1:0] m_axis_tid_int;
logic [M_ID_W-1:0] m_axis_tid_int;
logic [M_DEST_W-1:0] m_axis_tdest_int;
logic [USER_W-1:0] m_axis_tuser_int;
wire m_axis_tready_int_early;
@@ -115,7 +131,15 @@ always_comb begin
if (!frame_reg && s_axis.tvalid && s_axis.tready) begin
// start of frame, grab select value
if (TDEST_ROUTE) begin
if (TID_ROUTE) begin
if (M_COUNT > 1) begin
select_ctl = s_axis.tid[S_ID_W-1:S_ID_W-CL_M_COUNT];
drop_ctl = (CL_M_COUNT+1)'(select_ctl) >= (CL_M_COUNT+1)'(M_COUNT);
end else begin
select_ctl = '0;
drop_ctl = 1'b0;
end
end else if (TDEST_ROUTE) begin
if (M_COUNT > 1) begin
select_ctl = s_axis.tdest[S_DEST_W-1:S_DEST_W-CL_M_COUNT];
drop_ctl = (CL_M_COUNT+1)'(select_ctl) >= (CL_M_COUNT+1)'(M_COUNT);
@@ -141,7 +165,7 @@ always_comb begin
m_axis_tvalid_int = '0;
m_axis_tvalid_int[select_ctl] = s_axis.tvalid && s_axis.tready && !drop_ctl;
m_axis_tlast_int = s_axis.tlast;
m_axis_tid_int = s_axis.tid;
m_axis_tid_int = M_ID_W'(s_axis.tid);
m_axis_tdest_int = M_DEST_W'(s_axis.tdest);
m_axis_tuser_int = s_axis.tuser;
end
@@ -170,7 +194,7 @@ logic [KEEP_W-1:0] m_axis_tkeep_reg = '0;
logic [KEEP_W-1:0] m_axis_tstrb_reg = '0;
logic [M_COUNT-1:0] m_axis_tvalid_reg = '0, m_axis_tvalid_next;
logic m_axis_tlast_reg = 1'b0;
logic [ID_W-1:0] m_axis_tid_reg = '0;
logic [M_ID_W-1:0] m_axis_tid_reg = '0;
logic [M_DEST_W-1:0] m_axis_tdest_reg = '0;
logic [USER_W-1:0] m_axis_tuser_reg = '0;
@@ -179,7 +203,7 @@ logic [KEEP_W-1:0] temp_m_axis_tkeep_reg = '0;
logic [KEEP_W-1:0] temp_m_axis_tstrb_reg = '0;
logic [M_COUNT-1:0] temp_m_axis_tvalid_reg = '0, temp_m_axis_tvalid_next;
logic temp_m_axis_tlast_reg = 1'b0;
logic [ID_W-1:0] temp_m_axis_tid_reg = '0;
logic [M_ID_W-1:0] temp_m_axis_tid_reg = '0;
logic [M_DEST_W-1:0] temp_m_axis_tdest_reg = '0;
logic [USER_W-1:0] temp_m_axis_tuser_reg = '0;