Add bootrom

[fpgaboy.git] / System.v

diff --git a/System.v b/System.v
index 8b8d61344f712e4c39cfae009bf71969f67039a9..0e464f52d24eb286cae3fb680816c56988ed73f8 100644 (file)
--- a/System.v
+++ b/System.v
@@ -6,27 +6,48 @@ 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
+
 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;
        reg [7:0] odata;
-       wire idata = data;
        assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
        
        always @(negedge clk)
@@ -46,7 +67,7 @@ module Switches(
        input clk,
        input wr, rd,
        input [7:0] switches,
-       output reg [7:0] ledout);
+       output reg [7:0] ledout = 0);
        
        wire decode = address == 16'hFF51;
        reg [7:0] odata;
@@ -68,21 +89,33 @@ 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 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 clk;       
-       CPUDCM dcm (.CLKIN_IN(xtal), .CLKFX_OUT(clk));
-
        wire [15:0] addr;       
        wire [7:0] data;
        wire wr, rd;
-
+       
+       wire irq, tmrirq, lcdcirq, vblankirq;
+       wire [7:0] jaddr;
+       wire [1:0] state;
+       
        GBZ80Core core(
                .clk(clk),
                .busaddress(addr),
                .busdata(data),
                .buswr(wr),
-               .busrd(rd));
+               .busrd(rd),
+               .irq(irq),
+               .jaddr(jaddr),
+               .state(state));
        
        ROM rom(
                .address(addr),
@@ -91,13 +124,50 @@ 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), 
-    .digit(digits), 
-    .out(seven),
-        .freeze(buttons[0])
-    );
+               .addr(addr), 
+               .clk(clk), 
+               .digit(digits), 
+               .out(seven),
+               .freeze(buttons[0]),
+               .periods(
+                       (state == 2'b00) ? 4'b0010 :
+                       (state == 2'b01) ? 4'b0001 :
+                       (state == 2'b10) ? 4'b1000 :
+                                          4'b0100) );
         
        Switches sw(
                .address(addr),
@@ -110,30 +180,38 @@ module CoreTop(
                );
 
        UART nouart (   /* no u */
-    .clk(clk), 
-    .wr(wr), 
-    .rd(rd), 
-    .addr(addr), 
-    .data(data), 
-    .serial(serio)
-    );
+               .clk(clk), 
+               .wr(wr), 
+               .rd(rd), 
+               .addr(addr), 
+               .data(data), 
+               .serial(serio)
+               );
 
-  InternalRAM ram(
+       InternalRAM ram(
                .address(addr),
                .data(data),
                .clk(clk),
                .wr(wr),
-               .rd(rd));
+               .rd(rd)
+               );
+       
+       MiniRAM mram(
+               .address(addr),
+               .data(data),
+               .clk(clk),
+               .wr(wr),
+               .rd(rd)
+               );
 
-       wire irq, tmrirq;
-       wire [7:0] jaddr;
        Timer tmr(
                .clk(clk),
                .wr(wr),
                .rd(rd),
                .addr(addr),
                .data(data),
-               .irq(tmrirq));
+               .irq(tmrirq)
+               );
        
        Interrupt intr(
                .clk(clk),
@@ -141,8 +219,8 @@ module CoreTop(
                .wr(wr),
                .addr(addr),
                .data(data),
-               .vblank(0),
-               .lcdc(0),
+               .vblank(vblankirq),
+               .lcdc(lcdcirq),
                .tovf(tmrirq),
                .serial(0),
                .buttons(0),
@@ -156,16 +234,21 @@ module TestBench();
        wire [7:0] data;
        wire wr, rd;
        
-//     wire [7:0] leds;
-//     wire [7:0] switches;
+       wire irq, tmrirq;
+       wire [7:0] jaddr;
        
-       always #10 clk <= ~clk;
+       wire [7:0] leds;
+       wire [7:0] switches;
+       
+       always #62 clk <= ~clk;
        GBZ80Core core(
                .clk(clk),
                .busaddress(addr),
                .busdata(data),
                .buswr(wr),
-               .busrd(rd));
+               .busrd(rd),
+               .irq(irq),
+               .jaddr(jaddr));
        
        ROM rom(
                .clk(clk),
@@ -190,8 +273,6 @@ module TestBench();
                .rd(rd),
                .serial(serio));
        
-       wire irq, tmrirq;
-       wire [7:0] jaddr;
        Timer tmr(
                .clk(clk),
                .wr(wr),
@@ -214,12 +295,12 @@ module TestBench();
                .master(irq),
                .jaddr(jaddr));
        
-//     Switches sw(
-//             .clk(clk),
-//             .address(addr),
-//             .data(data),
-//             .wr(wr),
-//             .rd(rd),
-//             .switches(switches),
-//             .leds(leds));
+       Switches sw(
+               .clk(clk),
+               .address(addr),
+               .data(data),
+               .wr(wr),
+               .rd(rd),
+               .switches(switches),
+               .ledout(leds));
 endmodule