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library ieee;
use ieee.std_logic_1164.all;
--use ieee.numeric_std.all;
entity ppu is
port(
CLK100: in std_logic; -- system clock
RESET: in std_logic; -- global (async) system reset
EN: in std_logic; -- PPU VRAM enable (enable ADDR and DATA tri-state drivers)
WEN: in std_logic; -- PPU VRAM write enable
ADDR: in std_logic_vector(15 downto 0); -- PPU VRAM ADDR
DATA: in std_logic_vector(15 downto 0);
R,G,B: out std_logic_vector(3 downto 0);
NVSYNC, NHSYNC: out std_logic; -- native VGA out
TVSYNC, TVBLANK, THSYNC, THBLANK: out std_logic); -- tiny VGA out
end ppu;
architecture Behavioral of ppu is
constant PPU_FG_SPRITE_COUNT: natural := 1; -- 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_PIPELINE_STAGE_COUNT: natural := 5; -- amount of pipeline clock edges to generate
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
component ppu_pceg port( -- pipeline clock edge generator
CLK: in std_logic; -- system clock
R: in std_logic; -- async reset
S: out std_logic_vector(PPU_PIPELINE_STAGE_COUNT-1 downto 0)); -- pipeline stages
end component;
component ppu_addr_dec port( -- pipeline clock edge generator
WEN: in std_logic; -- EXT write enable
TMM_WEN,
BAM_WEN,
FAM_WEN,
PAL_WEN,
AUX_WEN: out std_logic; -- write enable MUX
TMM_DI: out std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0); -- TMM write DATA MUX
BAM_DI: out std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0); -- BAM write DATA MUX
FAM_DI: out std_logic_vector(PPU_FAM_DATA_WIDTH-1 downto 0); -- FAM write DATA MUX
PAL_DI: out std_logic_vector(PPU_PAL_DATA_WIDTH-1 downto 0); -- PAL write DATA MUX
AUX_DI: out std_logic_vector(PPU_AUX_DATA_WIDTH-1 downto 0); -- AUX write DATA MUX
EN: in std_logic; -- EXT *ADDR enable (switch *AO to ADDR instead of *AI)
ADDR: in std_logic_vector(15 downto 0); -- address in
TMM_AI: in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
BAM_AI: in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
FAM_AI: in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
PAL_AI: in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
AUX_AI: in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
TMM_AO: out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
BAM_AO: out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
FAM_AO: out std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
PAL_AO: out std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
AUX_AO: out std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0));
end component;
component ppu_bam port( -- BAM block memory
clka: in std_logic;
rsta: in std_logic;
wea: in std_logic_vector(0 downto 0);
addra: in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
dina: in std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
douta: out std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
rsta_busy: out std_logic);
end component;
component ppu_tmm port( -- TMM block memory
clka: in std_logic;
rsta: in std_logic;
wea: in std_logic_vector(0 downto 0);
addra: in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
dina: in std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
douta: out std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
rsta_busy: out std_logic);
end component;
component ppu_sprite_bg port( -- background sprite
-- inputs
CLK: in std_logic; -- system clock
OE: in std_logic; -- output enable (of CIDX)
X: in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
Y: in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
-- internal memory block (AUX)
AUX_WEN: in std_logic; -- VRAM AUX write enable
AUX_ADDR: in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0); -- VRAM AUX address
AUX_DATA: in std_logic_vector(PPU_AUX_DATA_WIDTH-1 downto 0); -- VRAM AUX data
-- used memory blocks
BAM_ADDR: out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
BAM_DATA: in std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
TMM_ADDR: out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
TMM_DATA: in std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
-- outputs
CIDX: out std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0)); -- output color
end component;
component ppu_sprite_fg port( -- foreground sprite
-- inputs
CLK: in std_logic; -- system clock
OE: in std_logic; -- output enable (of CIDX)
X: in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
Y: in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
FETCH: in std_logic; -- fetch sprite data from TMM (TODO: generic map, set foreground sprite component index)
-- internal memory block (FAM)
FAM_WEN: in std_logic; -- VRAM FAM write enable
FAM_ADDR: in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0); -- VRAM fam address
FAM_DATA: in std_logic_vector(PPU_FAM_DATA_WIDTH-1 downto 0); -- VRAM fam data
-- used memory blocks
TMM_ADDR: out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
TMM_DATA: in std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
-- outputs
CIDX: out std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0); -- output color
HIT: out std_logic); -- current pixel is not transparent
end component;
component ppu_comp port( -- compositor
FG_HIT: in std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0);
BG_EN: out std_logic;
FG_EN: out std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0));
end component;
component ppu_plut port( -- palette lookup table
CLK: in std_logic; -- system clock
CIDX: in std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0); -- color in
RESET: in std_logic;
-- internal memory block (AUX)
PAL_WEN: in std_logic; -- VRAM PAL write enable
PAL_ADDR: in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0); -- VRAM PAL address
PAL_DATA: in std_logic_vector(PPU_PAL_DATA_WIDTH-1 downto 0); -- VRAM PAL data
R,G,B: out std_logic_vector(3 downto 0)); -- VGA color out
end component;
component ppu_vga_tiny port( -- tiny vga signal generator
CLK: in std_logic; -- system clock
RESET: in std_logic;
X: out std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
Y: out std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
PREADY: out std_logic; -- current pixel ready (pixel color is stable)
VSYNC, VBLANK,
HSYNC, HBLANK: out std_logic); -- VGA sync outputs
end component;
component ppu_vga_native port( -- native vga signal generator (upscaler)
CLK: in std_logic; -- system clock
RESET: in std_logic;
X: in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
Y: in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
PREADY: in std_logic; -- current pixel ready (pixel color is stable)
RI,GI,BI: in std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- VGA color in
RO,GO,BO: out std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- VGA color out
VSYNC, HSYNC: out std_logic); -- VGA sync outputs
end component;
-- signals
signal SYSCLK, SYSRST: std_logic; -- system clock and reset
signal PL_S: std_logic_vector(PPU_PIPELINE_STAGE_COUNT-1 downto 0); -- pipeline stages
signal TMM_WEN, BAM_WEN, FAM_WEN, PAL_WEN, AUX_WEN: std_logic;
signal TMM_AI, TMM_AO: std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
signal BAM_AI, BAM_AO: std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
signal FAM_AI, FAM_AO: std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
signal PAL_AI, PAL_AO: std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
signal AUX_AI, AUX_AO: std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
signal TMM_DI, TMM_DO: std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
signal BAM_DI, BAM_DO: std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
signal FAM_DI, FAM_DO: std_logic_vector(PPU_FAM_DATA_WIDTH-1 downto 0);
signal PAL_DI, PAL_DO: std_logic_vector(PPU_PAL_DATA_WIDTH-1 downto 0);
signal AUX_DI, AUX_DO: std_logic_vector(PPU_AUX_DATA_WIDTH-1 downto 0);
signal CIDX: std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0);
signal BG_EN: std_logic;
signal FG_EN, FG_HIT: std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0);
signal X: std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
signal Y: std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
signal TR,TG,TB: std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- tiny RGB out (to be buffered)
signal PREADY: std_logic; -- current pixel color stable
begin
SYSCLK <= CLK100;
SYSRST <= RESET;
pipeline_clock_edge_generator: component ppu_pceg port map(
CLK => SYSCLK,
R => SYSRST,
S => PL_S);
address_decoder: component ppu_addr_dec port map(
EN => EN,
WEN => WEN,
ADDR => ADDR,
TMM_DI => TMM_DI,
BAM_DI => BAM_DI,
FAM_DI => FAM_DI,
PAL_DI => PAL_DI,
AUX_DI => AUX_DI,
TMM_AI => TMM_AI,
BAM_AI => BAM_AI,
FAM_AI => FAM_AI,
PAL_AI => PAL_AI,
AUX_AI => AUX_AI,
TMM_AO => TMM_AO,
BAM_AO => BAM_AO,
FAM_AO => FAM_AO,
PAL_AO => PAL_AO,
AUX_AO => AUX_AO,
TMM_WEN => TMM_WEN,
BAM_WEN => BAM_WEN,
FAM_WEN => FAM_WEN,
PAL_WEN => PAL_WEN,
AUX_WEN => AUX_WEN);
background_attribute_memory: component ppu_bam port map(
clka => SYSCLK,
rsta => SYSRST,
wea => (others => BAM_WEN),
addra => BAM_AO,
dina => BAM_DI,
douta => BAM_DO,
rsta_busy => open);
tilemap_memory: component ppu_tmm port map(
clka => SYSCLK,
rsta => SYSRST,
wea => (others => TMM_WEN),
addra => TMM_AO,
dina => TMM_DI,
douta => TMM_DO,
rsta_busy => open);
background_sprite: component ppu_sprite_bg port map(
CLK => SYSCLK,
OE => BG_EN,
X => X,
Y => Y,
AUX_WEN => AUX_WEN,
AUX_ADDR => AUX_AO,
AUX_DATA => AUX_DI,
BAM_ADDR => BAM_AI,
BAM_DATA => BAM_DO,
TMM_ADDR => TMM_AI,
TMM_DATA => TMM_DO,
CIDX => CIDX);
foreground_sprites: for FG_IDX in 0 to PPU_FG_SPRITE_COUNT-1 generate
foreground_sprite: component ppu_sprite_fg port map(
CLK => SYSCLK,
OE => FG_EN(FG_IDX),
X => X,
Y => Y,
FETCH => '0',
FAM_WEN => FAM_WEN,
FAM_ADDR => FAM_AO,
FAM_DATA => FAM_DI,
TMM_ADDR => TMM_AI,
TMM_DATA => TMM_DO,
CIDX => CIDX,
HIT => FG_HIT(FG_IDX));
end generate;
compositor: component ppu_comp port map( -- compositor
FG_HIT => FG_HIT,
BG_EN => BG_EN,
FG_EN => FG_EN);
palette_lookup: component ppu_plut port map( -- palette lookup table
CLK => SYSCLK,
CIDX => CIDX,
RESET => SYSRST,
PAL_WEN => PAL_WEN,
PAL_ADDR => PAL_AO,
PAL_DATA => PAL_DI,
R => TR,
G => TG,
B => TB);
tiny_vga_signal_generator: component ppu_vga_tiny port map( -- tiny vga signal generator
CLK => SYSCLK,
RESET => SYSRST,
X => X,
Y => Y,
PREADY => PREADY,
VSYNC => TVSYNC,
VBLANK => TVBLANK,
HSYNC => THSYNC,
HBLANK => THBLANK);
native_vga_signal_generator: component ppu_vga_native port map( -- native vga signal generator (upscaler)
CLK => SYSCLK,
RESET => SYSRST,
X => X,
Y => Y,
PREADY => PREADY,
RI => TR,
GI => TG,
BI => TB,
RO => R,
GO => G,
BO => B,
VSYNC => NVSYNC,
HSYNC => NHSYNC);
end Behavioral;
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