diff options
| author | Alejandro Soto <alejandro@34project.org> | 2023-10-29 18:59:33 -0600 |
|---|---|---|
| committer | Alejandro Soto <alejandro@34project.org> | 2023-10-29 19:48:23 -0600 |
| commit | eed877444f9af85d6e4596853d8f188e61f6c4ed (patch) | |
| tree | 53f54a96b006f4a3d0fa952292408e7d63f81a61 /rtl/gfx/gfx_scanout.sv | |
| parent | adabbf5f30729092a64fa1059bbc7d7b09d6b24e (diff) | |
rtl/gfx: implement scanout command interface
Diffstat (limited to 'rtl/gfx/gfx_scanout.sv')
| -rw-r--r-- | rtl/gfx/gfx_scanout.sv | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/rtl/gfx/gfx_scanout.sv b/rtl/gfx/gfx_scanout.sv index 7d2346b..c549782 100644 --- a/rtl/gfx/gfx_scanout.sv +++ b/rtl/gfx/gfx_scanout.sv @@ -5,6 +5,7 @@ module gfx_scanout input logic clk, rst_n, + input logic enable_clear, input rgb24 clear_color, input logic mask, @@ -20,7 +21,9 @@ module gfx_scanout output logic scan_valid, scan_endofpacket, scan_startofpacket, - output rgb30 scan_data + output rgb30 scan_data, + + output logic vsync ); logic[`GFX_SCAN_STAGES:0] fb_ready, fb_valid, src_ready, src_valid, src_pipes; @@ -28,7 +31,7 @@ module gfx_scanout logic[`GFX_MASK_STAGES - 1:0] request_valid; logic[$clog2(`GFX_SCAN_STAGES) - 1:0] queued; - logic foreground, foreground_valid, partial, put_fb_valid, put_src_valid, + logic effective_mask, foreground, foreground_valid, partial, put_fb_valid, put_src_valid, queued_dec, queued_inc, read_half, read_valid, request_flush; rgb24 fb_pipes[`GFX_SCAN_STAGES + 1], scan_pixel; @@ -61,10 +64,11 @@ module gfx_scanout assign read_half = request_pos[`GFX_MASK_STAGES - 1][0]; assign read_valid = request_valid[`GFX_MASK_STAGES - 1]; - assign request_flush = (fb_read && fb_waitrequest) || (src_valid[0] && !src_ready[0]) || queued == `GFX_SCAN_STAGES; + assign request_flush = (fb_read && fb_waitrequest) || (src_valid[0] && !src_ready[0]) || queued == `GFX_SCAN_STAGES || vsync; - assign queued_inc = !request_flush && read_valid && read_half && mask; + assign queued_inc = !request_flush && read_valid && read_half && effective_mask; assign queued_dec = fb_ready[`GFX_SCAN_STAGES - 1] && fb_valid[`GFX_SCAN_STAGES - 1]; + assign effective_mask = mask || !enable_clear; genvar i; generate @@ -109,6 +113,7 @@ module gfx_scanout always_ff @(posedge clk or negedge rst_n) if (!rst_n) begin + vsync <= 0; queued <= 0; read_pos <= 0; @@ -146,12 +151,14 @@ module gfx_scanout put_src_valid <= 0; if (!request_flush) begin - fb_read <= read_valid && mask; + fb_read <= read_valid && effective_mask; put_src_valid <= read_valid && read_half; if (read_valid) commit_pos <= request_pos[`GFX_MASK_STAGES - 1]; end + + vsync <= !vsync && !request_flush && read_valid && request_pos[`GFX_MASK_STAGES - 1] == {last_pos, 1'b1}; end always_ff @(posedge clk) begin @@ -159,7 +166,7 @@ module gfx_scanout if (!request_flush) begin fb_address <= request_pos[`GFX_MASK_STAGES - 1]; - src_pipes[0] <= mask; + src_pipes[0] <= effective_mask; end if (fb_readdatavalid) begin |