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ppu.v
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module ppu (
input clock,
input [15:0] A_mmu,
output [7:0] Do_mmu,
input [7:0] Di_mmu,
input cs_mmu,
input wr_mmu,
input rd_mmu,
output [15:0] A_vramio,
output [7:0] Do_vramio,
input [7:0] Di_vramio,
output wr_vramio,
output rd_vramio,
output [15:0] A_oamio,
output [7:0] Do_oamio,
input [7:0] Di_oamio,
output wr_oamio,
output rd_oamio,
output reg VBlankIRQ,
output LCDCIrq,
output [7:0] dmaAdress,
output reg [7:0] LY = 8'b0,
output [159:0] LinePxlOutput0,
output [159:0] LinePxlOutput1,
output reg updateBufferSignal = 1'b0
);
assign dmaAdress = DMA;
assign LinePxlOutput0 = LCDC[0] ? LinePxlColorArray0 : 160'b0;
assign LinePxlOutput1 = LCDC[0] ? LinePxlColorArray1 : 160'b0;
reg [159:0] LineBGDotDatas0;
reg [159:0] LineBGDotDatas1;
reg [159:0] LinePxlColorArray0;
reg [159:0] LinePxlColorArray1;
reg [8:0] XCount = 9'b0;
reg [15:0] A_vram = 16'h1800;
reg [7:0] Do_vram = 8'b0;
wire [7:0] Di_vram;
reg wr_vram = 1'b0;
reg rd_vram = 1'b1;
reg [15:0] A_oam = 16'h0000;
reg [7:0] Do_oam = 8'b0;
wire [7:0] Di_oam;
reg wr_oam = 1'b0;
reg rd_oam = 1'b1;
reg [7:0] LCDC = 8'b0;
reg [4:0] HSTAT = 5'b0;
wire [2:0] LSTAT;
reg [7:0] SCY = 8'b0;
reg [7:0] SCX = 8'b0;
// reg [7:0] LY = 8'b0;
reg [7:0] LYC = 8'b0;
reg [7:0] DMA = 8'b0;
reg [7:0] BGP = 8'b0;
reg [7:0] OBP0 = 8'b0;
reg [7:0] OBP1 = 8'b0;
reg [7:0] WY = 8'b0;
reg [7:0] WX = 8'b0;
wire [15:0] A_mmuToVram;
wire [7:0] Do_mmuToVram;
wire [7:0] Di_mmuToVram;
wire cs_mmuToVram;
wire wr_mmuToVram;
wire rd_mmuToVram;
wire [15:0] A_mmuToOam;
wire [7:0] Do_mmuToOam;
wire [7:0] Di_mmuToOam;
wire cs_mmuToOam;
wire wr_mmuToOam;
wire rd_mmuToOam;
ppuInternalMMU ppuInternalMMU0 (
A_mmu,
Do_mmu,
Di_mmu,
wr_mmu,
rd_mmu,
A_mmuToVram,
Do_mmuToVram,
Di_mmuToVram,
cs_mmuToVram,
wr_mmuToVram,
rd_mmuToVram,
A_mmuToOam,
Do_mmuToOam,
Di_mmuToOam,
cs_mmuToOam,
wr_mmuToOam,
rd_mmuToOam,
LCDC,
HSTAT,
LSTAT,
SCY ,
SCX ,
LY ,
LYC ,
DMA ,
BGP ,
OBP0,
OBP1,
WY ,
WX
);
assign Di_mmuToVram = LSTAT[1] & LSTAT[0] ? 8'hFF : Di_vramio;
assign Di_mmuToOam = ((LSTAT[1] & ~LSTAT[0]) | (LSTAT[1] & LSTAT[0])) ? 8'hFF : Di_oamio;
assign Di_vram = LSTAT[1] & LSTAT[0] ? Di_vramio : 8'hFF;
assign Di_oam = ((LSTAT[1] & ~LSTAT[0]) | (LSTAT[1] & LSTAT[0])) ? Di_oamio : 8'hFF;
assign A_vramio = LSTAT[1] & LSTAT[0] ? A_vram : A_mmuToVram;
assign Do_vramio = LSTAT[1] & LSTAT[0] ? Do_vram : Do_mmuToVram;
assign wr_vramio = LSTAT[1] & LSTAT[0] ? wr_vram : wr_mmuToVram;
assign rd_vramio = LSTAT[1] & LSTAT[0] ? rd_vram : rd_mmuToVram;
assign A_oamio = ((LSTAT[1] & ~LSTAT[0]) | (LSTAT[1] & LSTAT[0])) ? A_oam : A_mmuToOam;
assign Do_oamio = ((LSTAT[1] & ~LSTAT[0]) | (LSTAT[1] & LSTAT[0])) ? Do_oam : Do_mmuToOam;
assign wr_oamio = ((LSTAT[1] & ~LSTAT[0]) | (LSTAT[1] & LSTAT[0])) ? wr_oam : wr_mmuToOam;
assign rd_oamio = ((LSTAT[1] & ~LSTAT[0]) | (LSTAT[1] & LSTAT[0])) ? rd_oam : rd_mmuToOam;
always @(posedge clock) begin
if(cs_mmu && wr_mmu) begin
case (A_mmu)
16'hFF40: LCDC <= Di_mmu;
16'hFF41: HSTAT <= Di_mmu[7:3];
16'hFF42: SCY <= Di_mmu;
16'hFF43: SCX <= Di_mmu;
//16'hFF44: LY <= Di_mmu;
16'hFF45: LYC <= Di_mmu;
16'hFF46: DMA <= Di_mmu;
16'hFF47: BGP <= Di_mmu;
16'hFF48: OBP0 <= Di_mmu;
16'hFF49: OBP1 <= Di_mmu;
16'hFF4A: WY <= Di_mmu;
16'hFF4B: WX <= Di_mmu;
endcase
end
else
DMA <= 8'b0;
end
assign LCDCIrq = (HSTAT[3] && LSTAT[2]) || (HSTAT[2] && LSTAT[1] && ~LSTAT[0]) || (HSTAT[1] && ~LSTAT[1] && LSTAT[0]) || (HSTAT[0] && ~LSTAT[1] && ~LSTAT[0]);
assign LSTAT[1:0] = LCDC[7] == 1'b0 ? 2'd0 :
((LY >= 9'd144) ? 2'd1 :
(LY < 8'd144 && XCount < 9'd80) ? 2'd2 :
(LY < 8'd144 && XCount >= 9'd80 && XCount < 9'd252) ? 2'd3 :
2'd0);
assign LSTAT[2] = (LY == LYC) ? 1'b1 : 1'b0;
reg [7:0] OBJArray [9:0][4:0]; ///0: Y // 1: X // 2: CHR // 3: Parameters // 4: Index
reg [3:0] OBJIndex = 4'b0;
reg [5:0] OAMIndex = 6'b0;
reg [1:0] OAMYSortCount = 2'b00;
reg [3:0] OBJFetchDatasCount = 4'b0;
reg [3:0] OBJFetchIndex = 4'b0;
reg [2:0] renderMode = 3'b000; // 0: init BG rendering // 1: render BG // 2: init OBJ rendering // 3: render OBJ // 4: sleep
reg [4:0] renderBGCount = 5'b0;
reg [4:0] renderOBJCount = 5'd0;
reg [7:0] pixelDotData = 8'b0;
reg [4:0] xBGTileIndex = 5'b0;
reg [3:0] OBJRenderIndex = 4'b0;
reg [2:0] renderAssembly = 3'b000;
reg [7:0] currentTileAddress = 8'b0;
integer i;
always @(posedge clock) begin
if (LCDC[7]) begin
case (LSTAT[1:0])
2'b10: begin
renderAssembly <= 3'd0;
VBlankIRQ <= 1'b0;
LinePxlColorArray0 = 160'b0;
LinePxlColorArray1 = 160'b0;
LineBGDotDatas0 = 160'b0;
LineBGDotDatas1 = 160'b0;
case(OAMYSortCount)
2'd0 : begin
OAMYSortCount <= OAMYSortCount + 1'b1;
A_oam <= 16'h0000;
end
2'd1 : begin
OAMYSortCount <= OAMYSortCount + 1'b1;
end
2'd2 : begin
A_oam <= {8'h0, OAMIndex + 1'b1, 2'b00};
if((Di_oam >= LY + (LCDC[2] ? 8'd1 : 8'd9)) && (Di_oam <= LY + 8'd16) && (OBJIndex < 4'd10) && (Di_oam != 8'b0)) begin
OBJArray[OBJIndex][0] <= Di_oam;
OBJArray[OBJIndex][4] <= {2'b0, OAMIndex};
OBJIndex <= OBJIndex + 1'b1;
end
OAMYSortCount <= 2'd1;
OAMIndex <= OAMIndex + 1'b1;
end
endcase
end
2'b11: begin
if(OBJFetchIndex < OBJIndex) begin
case(OBJFetchDatasCount)
5'd0: begin
OBJFetchDatasCount <= OBJFetchDatasCount + 1'b1;
A_oam <= {6'b0, OBJArray[OBJFetchIndex][4], 2'b01};
end
5'd1: OBJFetchDatasCount <= OBJFetchDatasCount + 1'b1;
5'd2: begin
OBJFetchDatasCount <= OBJFetchDatasCount + 1'b1;
OBJArray[OBJFetchIndex][1] <= Di_oam;
A_oam <= {6'b0, OBJArray[OBJFetchIndex][4], 2'b10};
end
5'd3: OBJFetchDatasCount <= OBJFetchDatasCount + 1'b1;
5'd4: begin
OBJFetchDatasCount <= OBJFetchDatasCount + 1'b1;
OBJArray[OBJFetchIndex][2] <= Di_oam;
A_oam <= {6'b0, OBJArray[OBJFetchIndex][4], 2'b11};
end
5'd5: OBJFetchDatasCount <= OBJFetchDatasCount + 1'b1;
5'd6: begin
OBJFetchDatasCount <= 4'b0;
OBJFetchIndex <= OBJFetchIndex + 1'b1;
OBJArray[OBJFetchIndex][3] <= Di_oam;
end
endcase
end
case(renderMode)
3'b000: begin
if ((WX <= 8'd7 && 8'b0 == WY) && LCDC[5])
renderMode = 3'b010;
else
begin
A_vram <= (LCDC[3] ? 16'h1C00 : 16'h1800) + 16'h0020 * LY[7:3];
renderMode <= 3'b001;
end
end
3'b001: begin
case(renderBGCount)
5'd0 : begin renderBGCount <= renderBGCount + 1'b1; end
5'd1 : begin
A_vram <= {4'b0000, Di_vram + (LCDC[4] ? 1'b0 : 8'h80), LY[2:0], 1'b0} + (LCDC[4] ? 1'b0 : 16'h0800);
currentTileAddress <= Di_vram;
renderBGCount <= renderBGCount + 1'b1; end
5'd2 : begin renderBGCount <= renderBGCount + 1'b1; end
5'd3 : begin for(i = 0; i < 8; i = i + 1) begin
LineBGDotDatas0[8 * xBGTileIndex + i] <= Di_vram[7-i];
end
A_vram <= {4'b0000, currentTileAddress + (LCDC[4] ? 1'b0 : 8'h80), LY[2:0], 1'b1} + (LCDC[4] ? 1'b0 : 16'h0800);
renderBGCount <= renderBGCount + 1'b1; end
5'd4 : begin
renderBGCount <= renderBGCount + 1'b1; end
5'd5 : begin for(i = 0; i < 8; i = i + 1)
begin
LineBGDotDatas1[8 * xBGTileIndex + i] <= Di_vram[7-i];
case({Di_vram[7-i], LineBGDotDatas0[8 * xBGTileIndex + i]})
2'b00: {LinePxlColorArray1[8 * xBGTileIndex + i], LinePxlColorArray0[8 * xBGTileIndex + i]} <= BGP[1:0];
2'b01: {LinePxlColorArray1[8 * xBGTileIndex + i], LinePxlColorArray0[8 * xBGTileIndex + i]} <= BGP[3:2];
2'b10: {LinePxlColorArray1[8 * xBGTileIndex + i], LinePxlColorArray0[8 * xBGTileIndex + i]} <= BGP[5:4];
2'b11: {LinePxlColorArray1[8 * xBGTileIndex + i], LinePxlColorArray0[8 * xBGTileIndex + i]} <= BGP[7:6];
endcase
end
A_vram <= (LCDC[3] ? 16'h1C00 : 16'h1800) + (xBGTileIndex + 1'b1) + 16'h0020 * LY[7:3];
renderBGCount <= 5'd0;
if (xBGTileIndex == 5'd20 || (({xBGTileIndex + 1'b1, 3'b0} + 3'd7 > WX && LY + 1'b1 >= WY) && LCDC[5]))
renderMode = 3'b010;
//renderMode = 3'b100;
else
xBGTileIndex <= xBGTileIndex + 1'b1; end
endcase
end
3'b010: begin
if(WX < 8'd167 && WY <= LY && LCDC[5]) begin
A_vram <= (LCDC[6] ? 16'h1C00 : 16'h1800) + 16'h0020 * ((LY - WY) >> 3);
renderMode <= 3'b011;
xBGTileIndex <= 5'b0;
end
else
renderMode <= 3'b100;
end
3'b011: begin
case(renderBGCount)
5'd0 : begin renderBGCount <= renderBGCount + 1'b1; end
5'd1 : begin
A_vram <= LCDC[4] ? {4'b0000, Di_vram, LY[2:0] - WY[2:0], 1'b0} : ({4'b0000, Di_vram + 8'h80, LY[2:0] - WY[2:0], 1'b0} + 16'h0800);
currentTileAddress <= Di_vram;
renderBGCount <= renderBGCount + 1'b1; end
5'd2 : begin renderBGCount <= renderBGCount + 1'b1; end
5'd3 : begin for(i = 0; i < 8; i = i + 1) begin
LineBGDotDatas0[8 * xBGTileIndex + WX - 3'd7 + i] <= Di_vram[7-i];
end
A_vram <= LCDC[4] ? {4'b0000, currentTileAddress, LY[2:0] - WY[2:0], 1'b1} : ({4'b0000, currentTileAddress + 8'h80, LY[2:0] - WY[2:0], 1'b1} + 16'h0800);
renderBGCount <= renderBGCount + 1'b1; end
5'd4 : begin
renderBGCount <= renderBGCount + 1'b1; end
5'd5 : begin for(i = 0; i < 8; i = i + 1)
begin
LineBGDotDatas1[8 * xBGTileIndex + WX - 3'd7 + i] <= Di_vram[7-i];
case({Di_vram[7-i], LineBGDotDatas0[8 * xBGTileIndex + WX - 3'd7 + i]})
2'b00: {LinePxlColorArray1[8 * xBGTileIndex + WX - 3'd7 + i], LinePxlColorArray0[8 * xBGTileIndex + WX - 3'd7 + i]} <= BGP[1:0];
2'b01: {LinePxlColorArray1[8 * xBGTileIndex + WX - 3'd7 + i], LinePxlColorArray0[8 * xBGTileIndex + WX - 3'd7 + i]} <= BGP[3:2];
2'b10: {LinePxlColorArray1[8 * xBGTileIndex + WX - 3'd7 + i], LinePxlColorArray0[8 * xBGTileIndex + WX - 3'd7 + i]} <= BGP[5:4];
2'b11: {LinePxlColorArray1[8 * xBGTileIndex + WX - 3'd7 + i], LinePxlColorArray0[8 * xBGTileIndex + WX - 3'd7 + i]} <= BGP[7:6];
endcase
end
A_vram <= (LCDC[6] ? 16'h1C00 : 16'h1800) + (xBGTileIndex + 1'b1) + 16'h0020 * ((LY - WY) >> 3);
renderBGCount <= 5'd0;
if ({xBGTileIndex + 1'b1, 3'b0} + WX - 3'd7 > 8'd160)
renderMode = 3'b100;
else
xBGTileIndex <= xBGTileIndex + 1'b1; end
endcase
end
3'b100: begin
if(OBJIndex != 4'b0 && LCDC[1]) begin
if(OBJArray[OBJRenderIndex][0] - LY < 4'd9)
case(OBJArray[OBJRenderIndex][3][6])
1'b0 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex][2] + 1'b1, LY[2:0] - OBJArray[OBJRenderIndex][0][2:0], 1'b0};
1'b1 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex][2] + 1'b1, 3'd7 - LY[2:0] + OBJArray[OBJRenderIndex][0][2:0], 1'b0};
endcase
else
case(OBJArray[OBJRenderIndex][3][6])
1'b0 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex][2], LY[2:0] - OBJArray[OBJRenderIndex][0][2:0], 1'b0};
1'b1 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex][2], 3'd7 - LY[2:0] + OBJArray[OBJRenderIndex][0][2:0], 1'b0};
endcase
renderMode <= 3'b101;
end
else
renderMode <= 3'b110;
end
3'b101: begin
case(renderOBJCount)
5'd0 : renderOBJCount <= renderOBJCount + 1'b1;
5'd1 : begin
for(i = 0; i < 8; i = i + 1)
case(OBJArray[OBJRenderIndex][3][5])
1'b0 : pixelDotData[i] <= Di_vram[7-i];
1'b1 : pixelDotData[i] <= Di_vram[i];
endcase
if(OBJArray[OBJRenderIndex][0] - LY < 4'd9)
case(OBJArray[OBJRenderIndex][3][6])
1'b0 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex][2] + 1'b1, LY[2:0] - OBJArray[OBJRenderIndex][0][2:0], 1'b1};
1'b1 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex][2] + 1'b1, 3'd7 - LY[2:0] + OBJArray[OBJRenderIndex][0][2:0], 1'b1};
endcase
else
case(OBJArray[OBJRenderIndex][3][6])
1'b0 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex][2], LY[2:0] - OBJArray[OBJRenderIndex][0][2:0], 1'b1};
1'b1 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex][2], 3'd7 - LY[2:0] + OBJArray[OBJRenderIndex][0][2:0], 1'b1};
endcase
renderOBJCount <= renderOBJCount + 1'b1;
end
5'd2 : renderOBJCount <= renderOBJCount + 1'b1;
5'd3 : begin
for(i = 0; i < 8; i = i + 1)
begin
if({LineBGDotDatas1[OBJArray[OBJRenderIndex][1] + i - 4'd8], LineBGDotDatas0[OBJArray[OBJRenderIndex][1] + i - 4'd8]} == 2'b00 ||
({OBJArray[OBJRenderIndex][3][5] ? Di_vram[i] : Di_vram[7-i], pixelDotData[i]} != 2'b00 && OBJArray[OBJRenderIndex][3][7] == 1'b0 ) )
begin
case(OBJArray[OBJRenderIndex][3][5])
1'b0 : begin
case({Di_vram[7-i], pixelDotData[i]})
2'b00: ;
2'b01: {LinePxlColorArray1[OBJArray[OBJRenderIndex][1] + i - 4'd8], LinePxlColorArray0[OBJArray[OBJRenderIndex][1] + i - 4'd8]} <= OBJArray[OBJRenderIndex][3][4] ? OBP1[3:2] : OBP0[3:2];
2'b10: {LinePxlColorArray1[OBJArray[OBJRenderIndex][1] + i - 4'd8], LinePxlColorArray0[OBJArray[OBJRenderIndex][1] + i - 4'd8]} <= OBJArray[OBJRenderIndex][3][4] ? OBP1[5:4] : OBP0[5:4];
2'b11: {LinePxlColorArray1[OBJArray[OBJRenderIndex][1] + i - 4'd8], LinePxlColorArray0[OBJArray[OBJRenderIndex][1] + i - 4'd8]} <= OBJArray[OBJRenderIndex][3][4] ? OBP1[7:6] : OBP0[7:6];
endcase
end
1'b1 : begin
case({Di_vram[i], pixelDotData[i]})
2'b00: ;
2'b01: {LinePxlColorArray1[OBJArray[OBJRenderIndex][1] + i - 4'd8], LinePxlColorArray0[OBJArray[OBJRenderIndex][1] + i - 4'd8]} <= OBJArray[OBJRenderIndex][3][4] ? OBP1[3:2] : OBP0[3:2];
2'b10: {LinePxlColorArray1[OBJArray[OBJRenderIndex][1] + i - 4'd8], LinePxlColorArray0[OBJArray[OBJRenderIndex][1] + i - 4'd8]} <= OBJArray[OBJRenderIndex][3][4] ? OBP1[5:4] : OBP0[5:4];
2'b11: {LinePxlColorArray1[OBJArray[OBJRenderIndex][1] + i - 4'd8], LinePxlColorArray0[OBJArray[OBJRenderIndex][1] + i - 4'd8]} <= OBJArray[OBJRenderIndex][3][4] ? OBP1[7:6] : OBP0[7:6];
endcase
end
endcase
end
end
renderOBJCount <= 5'b0;
if (OBJRenderIndex < OBJIndex - 1'b1)
begin
OBJRenderIndex <= OBJRenderIndex + 1'b1;
if(OBJArray[OBJRenderIndex + 1'b1][0] - LY < 4'd9)
case(OBJArray[OBJRenderIndex + 1'b1][3][6])
1'b0 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex + 1'b1][2] + 1'b1, LY[2:0] - OBJArray[OBJRenderIndex + 1'b1][0][2:0], 1'b0};
1'b1 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex + 1'b1][2] + 1'b1, 3'd7 - LY[2:0] + OBJArray[OBJRenderIndex + 1'b1][0][2:0], 1'b0};
endcase
else
case(OBJArray[OBJRenderIndex + 1'b1][3][6])
1'b0 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex + 1'b1][2], LY[2:0] - OBJArray[OBJRenderIndex + 1'b1][0][2:0], 1'b0};
1'b1 : A_vram <= {4'b0000, OBJArray[OBJRenderIndex + 1'b1][2], 3'd7 - LY[2:0] + OBJArray[OBJRenderIndex + 1'b1][0][2:0], 1'b0};
endcase
end
else
renderMode = 3'b110;
end
endcase
end
3'b110: begin
end
endcase
end
2'b00: begin
if(renderAssembly < 2'd2) begin
case(renderAssembly)
3'd0 : begin
updateBufferSignal <= 1'b1;
renderAssembly <= renderAssembly + 1'b1;
end
3'd1 : begin
xBGTileIndex <= 5'b0;
OBJRenderIndex <= 4'b0;
OBJIndex <= 4'b0;
OAMIndex <= 6'b0;
OBJFetchIndex <= 4'b0;
A_oam <= 16'b0;
A_vram <= 16'h1800;
renderMode <= 3'b000;
OAMYSortCount <= 2'b00;
OBJFetchDatasCount <= 4'b0;
renderBGCount <= 5'b0;
renderOBJCount <= 5'd0;
renderAssembly <= renderAssembly + 1'b1;
end
3'd2: begin
updateBufferSignal <= 1'b0;
end
endcase
end
end
2'b01: begin
VBlankIRQ <= 1'b1;
end
endcase
XCount <= (XCount == 9'd455) ? 9'd0 : (XCount + 1'b1);
if (XCount == 9'd455)
LY <= (LY == 8'd153) ? 8'd0 : (LY + 1'b1);
end
end
endmodule