From 7275f342f2b8d97ae02e0e51011442f063660b5d Mon Sep 17 00:00:00 2001 From: Alejandro Soto Date: Fri, 17 Nov 2023 14:18:29 -0600 Subject: rtl/gfx; rewrite scanout --- rtl/gfx/gfx_flush_flow.sv | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 rtl/gfx/gfx_flush_flow.sv (limited to 'rtl/gfx/gfx_flush_flow.sv') diff --git a/rtl/gfx/gfx_flush_flow.sv b/rtl/gfx/gfx_flush_flow.sv new file mode 100644 index 0000000..a0e43d7 --- /dev/null +++ b/rtl/gfx/gfx_flush_flow.sv @@ -0,0 +1,45 @@ +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 -- cgit v1.2.3