X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/6c46357c6f1bfeefc3a9f85aed03f94e923d09f1..b4f3ac35e69b7d5adf57959902abe2a104b42f4f:/System.v?ds=inline

diff --git a/System.v b/System.v
index 4081771..caa6ae3 100644
--- a/System.v
+++ b/System.v
@@ -6,22 +6,45 @@ module ROM(
 	input clk,
 	input wr, rd);
 
-	reg [7:0] rom [2047:0];
+	reg [7:0] rom [1023:0];
 	initial $readmemh("rom.hex", rom);
 
 	wire decode = address[15:13] == 0;
-	wire [7:0] odata = rom[address[11:0]];
+	wire [7:0] odata = rom[address[10:0]];
 	assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
 	//assign data = rd ? odata : 8'bzzzzzzzz;
 endmodule
 
+module MiniRAM(			/* XXX will need to go INSIDE the CPU for when we do DMA */
+	input [15:0] address,
+	inout [7:0] data,
+	input clk,
+	input wr, rd);
+	
+	reg [7:0] ram [127:0];
+	
+	wire decode = (address >= 16'hFF80) && (address <= 16'hFFFE);
+	reg [7:0] odata;
+	assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
+	
+	always @(negedge clk)
+	begin
+		if (decode)	// This has to go this way. The only way XST knows how to do
+		begin				// block ram is chip select, write enable, and always
+			if (wr)		// reading. "else if rd" does not cut it ...
+				ram[address[6:0]] <= data;
+			odata <= ram[address[6:0]];
+		end
+	end
+endmodule
+
 module InternalRAM(
 	input [15:0] address,
 	inout [7:0] data,
 	input clk,
 	input wr, rd);
 	
-	// synthesis attribute ram_style of reg is block
+	// synthesis attribute ram_style of ram is block
 	reg [7:0] ram [8191:0];
 	
 	wire decode = address[15:13] == 3'b110;
@@ -67,24 +90,26 @@ module CoreTop(
 	output wire [7:0] leds,
 	output serio,
 	output wire [3:0] digits,
-	output wire [7:0] seven);
+	output wire [7:0] seven,
+	output wire hs, vs,
+	output wire [2:0] r, g,
+	output wire [1:0] b);
 	
-	wire clk;	
-	CPUDCM dcm (.CLKIN_IN(xtal), .CLKFX_OUT(clk));
+	wire xtalb, clk, vgaclk;
+	IBUFG iclkbuf(.O(xtalb), .I(xtal));
+	CPUDCM dcm (.CLKIN_IN(xtalb), .CLKFX_OUT(clk));
+	pixDCM pixdcm (.CLKIN_IN(xtalb), .CLKFX_OUT(vgaclk));
 	
-	wire cclk;
-	IBUFG ibuf (.O(cclk), .I(switches[0]));
-
 	wire [15:0] addr;	
 	wire [7:0] data;
 	wire wr, rd;
 	
-	wire irq, tmrirq;
+	wire irq, tmrirq, lcdcirq, vblankirq;
 	wire [7:0] jaddr;
 	wire [1:0] state;
-
+	
 	GBZ80Core core(
-		.clk(cclk),
+		.clk(clk),
 		.busaddress(addr),
 		.busdata(data),
 		.buswr(wr),
@@ -100,6 +125,39 @@ module CoreTop(
 		.wr(wr),
 		.rd(rd));
 	
+	wire lcdhs, lcdvs, lcdclk;
+	wire [2:0] lcdr, lcdg;
+	wire [1:0] lcdb;
+	
+	LCDC lcdc(
+		.addr(addr),
+		.data(data),
+		.clk(clk),
+		.wr(wr),
+		.rd(rd),
+		.lcdcirq(lcdcirq),
+		.vblankirq(vblankirq),
+		.lcdclk(lcdclk),
+		.lcdhs(lcdhs),
+		.lcdvs(lcdvs),
+		.lcdr(lcdr),
+		.lcdg(lcdg),
+		.lcdb(lcdb));
+	
+	Framebuffer fb(
+		.lcdclk(lcdclk),
+		.lcdhs(lcdhs),
+		.lcdvs(lcdvs),
+		.lcdr(lcdr),
+		.lcdg(lcdg),
+		.lcdb(lcdb),
+		.vgaclk(vgaclk),
+		.vgahs(hs),
+		.vgavs(vs),
+		.vgar(r),
+		.vgag(g),
+		.vgab(b));
+	
 	AddrMon amon(
 		.addr(addr), 
 		.clk(clk), 
@@ -107,10 +165,10 @@ module CoreTop(
 		.out(seven),
 		.freeze(buttons[0]),
 		.periods(
-			(state == 2'b00) ? 4'b1000 :
-			(state == 2'b01) ? 4'b0100 :
-			(state == 2'b10) ? 4'b0010 :
-			                   4'b0001) );
+			(state == 2'b00) ? 4'b0010 :
+			(state == 2'b01) ? 4'b0001 :
+			(state == 2'b10) ? 4'b1000 :
+			                   4'b0100) );
 	 
 	Switches sw(
 		.address(addr),
@@ -119,7 +177,7 @@ module CoreTop(
 		.wr(wr),
 		.rd(rd),
 		.ledout(leds),
-		.switches({switches[7:1],1'b0})
+		.switches(switches)
 		);
 
 	UART nouart (	/* no u */
@@ -138,6 +196,14 @@ module CoreTop(
 		.wr(wr),
 		.rd(rd)
 		);
+	
+	MiniRAM mram(
+		.address(addr),
+		.data(data),
+		.clk(clk),
+		.wr(wr),
+		.rd(rd)
+		);
 
 	Timer tmr(
 		.clk(clk),
@@ -154,8 +220,8 @@ module CoreTop(
 		.wr(wr),
 		.addr(addr),
 		.data(data),
-		.vblank(0),
-		.lcdc(0),
+		.vblank(vblankirq),
+		.lcdc(lcdcirq),
 		.tovf(tmrirq),
 		.serial(0),
 		.buttons(0),
@@ -175,7 +241,7 @@ module TestBench();
 	wire [7:0] leds;
 	wire [7:0] switches;
 	
-	always #10 clk <= ~clk;
+	always #62 clk <= ~clk;
 	GBZ80Core core(
 		.clk(clk),
 		.busaddress(addr),