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using onehot multiplexer to reduce critical path

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This commit is contained in:
Blaise Tine
2021-07-08 00:26:59 -07:00
parent dc34c5c5bd
commit 10e9ee124b
11 changed files with 161 additions and 207 deletions
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2
hw/rtl/libs/VX_onehot_encoder.v
View File

@@ -67,7 +67,6 @@ module VX_onehot_encoder #(
reg [LN-1:0] index_r;
if (REVERSE) begin
always @(*) begin
index_r = 'x;
for (integer i = N-1; i >= 0; --i) begin
@@ -76,7 +75,6 @@ module VX_onehot_encoder #(
end
end
end
end else begin
always @(*) begin
index_r = 'x;

20
hw/rtl/libs/VX_onehot_mux.v Normal file
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@@ -0,0 +1,20 @@
`include "VX_platform.vh"
module VX_onehot_mux #(
parameter DATAW = 1,
parameter COUNT = 1
) (
input wire [COUNT-1:0][DATAW-1:0] data_in,
input wire [COUNT-1:0] sel_in,
output wire [DATAW-1:0] data_out
);
if (COUNT > 1) begin
for (genvar i = 0; i < COUNT; ++i) begin
assign data_out = sel_in[i] ? data_in[i] : 'z;
end
end else begin
`UNUSED_VAR (sel_in)
assign data_out = data_in;
end
endmodule

32
hw/rtl/libs/VX_stream_arbiter.v
View File

@@ -24,8 +24,7 @@ module VX_stream_arbiter #(
if (NUM_REQS > 1) begin
wire sel_valid;
wire sel_ready;
wire [LOG_NUM_REQS-1:0] sel_idx;
wire [NUM_REQS-1:0] sel_1hot;
wire [NUM_REQS-1:0] sel_1hot;
if (TYPE == "X") begin
VX_fixed_arbiter #(
@@ -37,8 +36,8 @@ module VX_stream_arbiter #(
.requests (valid_in),
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_index (sel_idx),
.grant_onehot (sel_1hot)
.grant_onehot (sel_1hot),
`UNUSED_PIN (grant_index)
);
end else if (TYPE == "R") begin
VX_rr_arbiter #(
@@ -50,8 +49,8 @@ module VX_stream_arbiter #(
.requests (valid_in),
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_index (sel_idx),
.grant_onehot (sel_1hot)
.grant_onehot (sel_1hot),
`UNUSED_PIN (grant_index)
);
end else if (TYPE == "F") begin
VX_fair_arbiter #(
@@ -63,8 +62,8 @@ module VX_stream_arbiter #(
.requests (valid_in),
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_index (sel_idx),
.grant_onehot (sel_1hot)
.grant_onehot (sel_1hot),
`UNUSED_PIN (grant_index)
);
end else if (TYPE == "M") begin
VX_matrix_arbiter #(
@@ -76,13 +75,24 @@ module VX_stream_arbiter #(
.requests (valid_in),
.enable (sel_ready),
.grant_valid (sel_valid),
.grant_index (sel_idx),
.grant_onehot (sel_1hot)
.grant_onehot (sel_1hot),
`UNUSED_PIN (grant_index)
);
end else begin
$error ("invalid parameter");
end
wire [DATAW-1:0] data_in_sel;
VX_onehot_mux #(
.DATAW (DATAW),
.COUNT (NUM_REQS)
) data_in_mux (
.data_in (data_in),
.sel_in (sel_1hot),
.data_out (data_in_sel)
);
VX_skid_buffer #(
.DATAW (DATAW),
.PASSTHRU (!BUFFERED)
@@ -90,7 +100,7 @@ module VX_stream_arbiter #(
.clk (clk),
.reset (reset),
.valid_in (sel_valid),
.data_in (data_in[sel_idx]),
.data_in (data_in_sel),
.ready_in (sel_ready),
.valid_out (valid_out),
.data_out (data_out),