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critical path optimizations

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This commit is contained in:
Blaise Tine
2021-09-15 04:50:45 -07:00
parent 73d102afed
commit feca2db24e
4 changed files with 49 additions and 50 deletions
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25
hw/rtl/libs/VX_stream_arbiter.v
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@@ -25,6 +25,7 @@ module VX_stream_arbiter #(
wire sel_valid;
wire sel_ready;
wire [LOG_NUM_REQS-1:0] sel_index;
wire [NUM_REQS-1:0] sel_onehot;
wire [NUM_REQS-1:0] valid_in_any;
wire [LANES-1:0] ready_in_sel;
@@ -42,13 +43,17 @@ module VX_stream_arbiter #(
end
if (TYPE == "P") begin
`UNUSED_VAR (sel_ready)
VX_lzc #(
.N (NUM_REQS)
VX_fixed_arbiter #(
.NUM_REQS (NUM_REQS),
.LOCK_ENABLE (LOCK_ENABLE)
) sel_arb (
.in_i (valid_in_any),
.cnt_o (sel_index),
.valid_o (sel_valid)
.clk (clk),
.reset (reset),
.requests (valid_in_any),
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_index (sel_index),
.grant_onehot (sel_onehot)
);
end else if (TYPE == "R") begin
VX_rr_arbiter #(
@@ -61,7 +66,7 @@ module VX_stream_arbiter #(
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_index (sel_index),
`UNUSED_PIN (grant_onehot)
.grant_onehot (sel_onehot)
);
end else if (TYPE == "F") begin
VX_fair_arbiter #(
@@ -74,7 +79,7 @@ module VX_stream_arbiter #(
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_index (sel_index),
`UNUSED_PIN (grant_onehot)
.grant_onehot (sel_onehot)
);
end else if (TYPE == "M") begin
VX_matrix_arbiter #(
@@ -87,7 +92,7 @@ module VX_stream_arbiter #(
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_index (sel_index),
`UNUSED_PIN (grant_onehot)
.grant_onehot (sel_onehot)
);
end else begin
$error ("invalid parameter");
@@ -109,7 +114,7 @@ module VX_stream_arbiter #(
end
for (genvar i = 0; i < NUM_REQS; i++) begin
assign ready_in[i] = ready_in_sel & {LANES{(sel_index == LOG_NUM_REQS'(i))}};
assign ready_in[i] = ready_in_sel & {LANES{sel_onehot[i]}};
end
for (genvar i = 0; i < LANES; ++i) begin