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Brendan Haines
2022-12-01 01:07:15 -07:00
parent f12d3be0bd
commit 5d3d9b222f
3 changed files with 145 additions and 150 deletions
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61
lib/skidbuffer.sv
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@@ -12,43 +12,42 @@ module skidbuffer #(
output logic out_valid,
input logic out_ready
);
logic buffer_filled = 0;
logic [WIDTH-1:0] buffer_val;
logic buffer_filled = 0;
logic [WIDTH-1:0] buffer_val;
always_ff @(posedge clk) begin
if (reset) begin
buffer_filled <= 0;
end else begin
if (in_valid && in_ready) begin
// input always gets stored whether it needs to be or not
buffer_val <= in;
end
if (buffer_filled) begin
if ((out_valid && out_ready) && !(in_valid && in_ready)) begin
// out_valid = 1 since buffer is full
buffer_filled <= 0;
end
always_ff @(posedge clk) begin
if (reset) begin
buffer_filled <= 0;
end else begin
if ((in_valid && in_ready) && !(out_valid && out_ready)) begin
// in_ready = 1 since buffer is empty
buffer_filled <= 1;
if (in_valid && in_ready) begin
// input always gets stored whether it needs to be or not
buffer_val <= in;
end
if (buffer_filled) begin
if ((out_valid && out_ready) && !(in_valid && in_ready)) begin
// out_valid = 1 since buffer is full
buffer_filled <= 0;
end
end else begin
if ((in_valid && in_ready) && !(out_valid && out_ready)) begin
// in_ready = 1 since buffer is empty
buffer_filled <= 1;
end
end
end
end
end
always_comb begin
if (buffer_filled) begin
in_ready = out_ready;
out_valid = 1;
out = buffer_val;
end else begin
in_ready = 1;
out_valid = in_valid;
out = in;
always_comb begin
if (buffer_filled) begin
in_ready = out_ready;
out_valid = 1;
out = buffer_val;
end else begin
in_ready = 1;
out_valid = in_valid;
out = in;
end
end
end
endmodule