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module gfx_flush_flow
#(parameter STAGES=0)
(
input logic clk,
rst_n,
input logic in_valid,
out_ready,
output logic out_valid,
commit,
flush
);
logic was_valid, was_ready;
logic[STAGES - 1:0] valid;
assign flush = was_valid && !was_ready;
assign commit = was_valid && was_ready;
assign out_valid = valid[STAGES - 1] && !flush;
always_ff @(posedge clk or negedge rst_n)
if (!rst_n) begin
was_ready <= 0;
was_valid <= 0;
for (integer i = 0; i < STAGES; ++i)
valid[i] <= 0;
end else begin
was_ready <= out_ready;
was_valid <= out_valid;
if (!flush)
valid[0] <= in_valid;
else
valid[0] <= 0;
for (integer i = 1; i < STAGES; ++i)
if (!flush)
valid[i] <= valid[i - 1];
else
valid[i] <= 0;
end
endmodule
|
