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stream arbiter optimization (using indexing instead of onehot mux)

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This commit is contained in:
Blaise Tine 2021-08-26 09:52:13 -07:00
parent d3d82de29e
commit 74a45e2772
1 changed files with 15 additions and 30 deletions
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45
hw/rtl/libs/VX_stream_arbiter.v
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@ -19,11 +19,12 @@ module VX_stream_arbiter #(
output wire [LANES-1:0][DATAW-1:0] data_out,
input wire [LANES-1:0] ready_out
);
localparam LOG_NUM_REQS = `CLOG2(NUM_REQS);
if (NUM_REQS > 1) begin
wire sel_valid;
wire sel_ready;
wire [NUM_REQS-1:0] sel_1hot;
wire sel_valid;
wire sel_ready;
wire [LOG_NUM_REQS-1:0] sel_index;
wire [NUM_REQS-1:0] valid_in_any;
wire [LANES-1:0] ready_in_sel;
@ -50,8 +51,8 @@ module VX_stream_arbiter #(
.requests (valid_in_any),
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_onehot (sel_1hot),
`UNUSED_PIN (grant_index)
.grant_index (sel_index),
`UNUSED_PIN (grant_onehot)
);
end else if (TYPE == "R") begin
VX_rr_arbiter #(
@ -63,8 +64,8 @@ module VX_stream_arbiter #(
.requests (valid_in_any),
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_onehot (sel_1hot),
`UNUSED_PIN (grant_index)
.grant_index (sel_index),
`UNUSED_PIN (grant_onehot)
);
end else if (TYPE == "F") begin
VX_fair_arbiter #(
@ -76,8 +77,8 @@ module VX_stream_arbiter #(
.requests (valid_in_any),
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_onehot (sel_1hot),
`UNUSED_PIN (grant_index)
.grant_index (sel_index),
`UNUSED_PIN (grant_onehot)
);
end else if (TYPE == "M") begin
VX_matrix_arbiter #(
@ -89,8 +90,8 @@ module VX_stream_arbiter #(
.requests (valid_in_any),
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_onehot (sel_1hot),
`UNUSED_PIN (grant_index)
.grant_index (sel_index),
`UNUSED_PIN (grant_onehot)
);
end else begin
$error ("invalid parameter");
@ -105,32 +106,16 @@ module VX_stream_arbiter #(
for (genvar i = 0; i < NUM_REQS; i++) begin
assign valid_data_in[i] = {valid_in[i], data_in[i]};
end
VX_onehot_mux #(
.DATAW (LANES * (1 + DATAW)),
.N (NUM_REQS)
) data_in_mux (
.data_in (valid_data_in),
.sel_in (sel_1hot),
.data_out ({valid_in_sel, data_in_sel})
);
assign {valid_in_sel, data_in_sel} = valid_data_in[sel_index];
`UNUSED_VAR (sel_valid)
end else begin
VX_onehot_mux #(
.DATAW (DATAW),
.N (NUM_REQS)
) data_in_mux (
.data_in (data_in),
.sel_in (sel_1hot),
.data_out (data_in_sel)
);
assign data_in_sel = data_in[sel_index];
assign valid_in_sel = sel_valid;
end
for (genvar i = 0; i < NUM_REQS; i++) begin
assign ready_in[i] = ready_in_sel & {LANES{sel_1hot[i]}};
assign ready_in[i] = ready_in_sel & {LANES{(sel_index == LOG_NUM_REQS'(i))}};
end
for (genvar i = 0; i < LANES; ++i) begin