diff options
| author | lonkaars <loek@pipeframe.xyz> | 2023-02-19 14:16:11 +0100 |
|---|---|---|
| committer | lonkaars <loek@pipeframe.xyz> | 2023-02-19 14:16:11 +0100 |
| commit | a5155f3346d962d2e79f82b1e89f16398b79f52a (patch) | |
| tree | afc321b1efbe9b75a58182efbac639cd8288f0d3 /basys3/basys3.srcs/ppu_consts.vhd | |
| parent | c395be5d4b20858f5eb183d84c4edaf7b5571060 (diff) | |
separate constants file for vhdl code
Diffstat (limited to 'basys3/basys3.srcs/ppu_consts.vhd')
| -rw-r--r-- | basys3/basys3.srcs/ppu_consts.vhd | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/basys3/basys3.srcs/ppu_consts.vhd b/basys3/basys3.srcs/ppu_consts.vhd new file mode 100644 index 0000000..d3c8403 --- /dev/null +++ b/basys3/basys3.srcs/ppu_consts.vhd @@ -0,0 +1,22 @@ +package ppu_consts is + constant PPU_RAM_BUS_ADDR_WIDTH: natural := 16; -- RAM bus address width + constant PPU_RAM_BUS_DATA_WIDTH: natural := 16; -- RAM bus data width + constant PPU_FG_SPRITE_COUNT: natural := 128; -- amount of foreground sprites + constant PPU_COLOR_OUTPUT_DEPTH: natural := 4; -- VGA output channel depth + constant PPU_PALETTE_IDX_WIDTH: natural := 3; -- palette index width (within sprite) + constant PPU_PALETTE_WIDTH: natural := 3; -- palette index width (palette table) + constant PPU_PALETTE_CIDX_WIDTH: natural := PPU_PALETTE_IDX_WIDTH + PPU_PALETTE_WIDTH; -- global palette index width + constant PPU_TMM_ADDR_WIDTH: natural := 16; + constant PPU_TMM_DATA_WIDTH: natural := 16; + constant PPU_BAM_ADDR_WIDTH: natural := 11; + constant PPU_BAM_DATA_WIDTH: natural := 15; + constant PPU_FAM_ADDR_WIDTH: natural := 8; + constant PPU_FAM_DATA_WIDTH: natural := 16; + constant PPU_PAL_ADDR_WIDTH: natural := 6; + constant PPU_PAL_DATA_WIDTH: natural := 12; + constant PPU_AUX_ADDR_WIDTH: natural := 2; + constant PPU_AUX_DATA_WIDTH: natural := 16; + constant PPU_POS_H_WIDTH: natural := 9; -- amount of bits for horizontal screen offset + constant PPU_POS_V_WIDTH: natural := 8; -- amount of bits for vertical screen offset +end package ppu_consts; + |