From adabbf5f30729092a64fa1059bbc7d7b09d6b24e Mon Sep 17 00:00:00 2001 From: Alejandro Soto Date: Sun, 29 Oct 2023 15:35:42 -0600 Subject: rtl/gfx: implement double-buffered scanout --- rtl/gfx/gfx_mask_sram.sv | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 rtl/gfx/gfx_mask_sram.sv (limited to 'rtl/gfx/gfx_mask_sram.sv') diff --git a/rtl/gfx/gfx_mask_sram.sv b/rtl/gfx/gfx_mask_sram.sv new file mode 100644 index 0000000..730ee12 --- /dev/null +++ b/rtl/gfx/gfx_mask_sram.sv @@ -0,0 +1,31 @@ +`include "gfx/gfx_defs.sv" + +module gfx_mask_sram +( + input logic clk, + + input logic set, + write, + input linear_coord write_addr, + read_addr, + output logic mask +); + + logic mem[`GFX_LINEAR_RES]; + logic mask_hold, write_hold, set_hold; + linear_coord read_addr_hold, write_addr_hold; + + always_ff @(posedge clk) begin + mask <= mask_hold; + mask_hold <= mem[read_addr_hold]; + read_addr_hold <= read_addr; + + set_hold <= set; + write_hold <= write; + write_addr_hold <= write_addr; + + if (write_hold) + mem[write_addr_hold] <= set_hold; + end + +endmodule -- cgit v1.2.3