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pipeline optimization: fixed GPR fanout delay to execute units

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This commit is contained in:
Blaise Tine
2020-11-07 02:01:21 -08:00
parent af2bb3b789
commit b14007f930
13 changed files with 155 additions and 151 deletions
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16
hw/rtl/libs/VX_skid_buffer.v
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@@ -17,24 +17,26 @@ module VX_skid_buffer #(
reg valid_out_r;
reg use_buffer;
wire push = valid_in && ready_in;
always @(posedge clk) begin
if (reset) begin
data_out_r <= 0;
buffer <= 0;
use_buffer <= 0;
valid_out_r <= 0;
end else begin
if (valid_in && ready_in && valid_out && !ready_out) begin
assert(!use_buffer);
use_buffer <= 1;
end
end else begin
if (ready_out) begin
use_buffer <= 0;
end
if (valid_in && ready_in) begin
if (push) begin
buffer <= data_in;
if (valid_out_r && !ready_out) begin
assert(!use_buffer);
use_buffer <= 1;
end
end
if (!valid_out || ready_out) begin
if (!valid_out_r || ready_out) begin
valid_out_r <= valid_in || use_buffer;
data_out_r <= use_buffer ? buffer : data_in;
end