Dual bus processor
[fpgaboy.git] / System.v
index cdcee09..4c5f85b 100644 (file)
--- a/System.v
+++ b/System.v
@@ -6,16 +6,30 @@ module ROM(
        input clk,
        input wr, rd);
 
+       // synthesis attribute ram_style of rom is block
        reg [7:0] rom [1023:0];
        initial $readmemh("rom.hex", rom);
 
        wire decode = address[15:13] == 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 */
+module BootstrapROM(
+       input [15:0] address,
+       inout [7:0] data,
+       input clk,
+       input wr, rd);
+
+       reg [7:0] rom [255:0];
+       initial $readmemh("bootstrap.hex", rom);
+
+       wire decode = address[15:8] == 0;
+       wire [7:0] odata = rom[address[7:0]];
+       assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
+endmodule
+
+module MiniRAM(
        input [15:0] address,
        inout [7:0] data,
        input clk,
@@ -125,9 +139,9 @@ module CoreTop(
        pixDCM pixdcm (.CLKIN_IN(xtalb), .CLKFX_OUT(vgaclk));
 `endif
 
-       wire [15:0] addr;       
-       wire [7:0] data;
-       wire wr, rd;
+       wire [15:0] addr [1:0];
+       wire [7:0] data [1:0];
+       wire wr [1:0], rd [1:0];
        
        wire irq, tmrirq, lcdcirq, vblankirq;
        wire [7:0] jaddr;
@@ -135,31 +149,42 @@ module CoreTop(
        
        GBZ80Core core(
                .clk(clk),
-               .busaddress(addr),
-               .busdata(data),
-               .buswr(wr),
-               .busrd(rd),
+               .bus0address(addr[0]),
+               .bus0data(data[0]),
+               .bus0wr(wr[0]),
+               .bus0rd(rd[0]),
+               .bus1address(addr[1]),
+               .bus1data(data[1]),
+               .bus1wr(wr[1]),
+               .bus1rd(rd[1]),
                .irq(irq),
                .jaddr(jaddr),
                .state(state));
        
+       BootstrapROM brom(
+               .address(addr[1]),
+               .data(data[1]),
+               .clk(clk),
+               .wr(wr[1]),
+               .rd(rd[1]));
+       
        ROM rom(
-               .address(addr),
-               .data(data),
+               .address(addr[0]),
+               .data(data[0]),
                .clk(clk),
-               .wr(wr),
-               .rd(rd));
+               .wr(wr[0]),
+               .rd(rd[0]));
        
        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),
+               .addr(addr[0]),
+               .data(data[0]),
+               .wr(wr[0]),
+               .rd(rd[0]),
                .lcdcirq(lcdcirq),
                .vblankirq(vblankirq),
                .lcdclk(lcdclk),
@@ -184,8 +209,8 @@ module CoreTop(
                .vgab(b));
        
        AddrMon amon(
-               .addr(addr), 
                .clk(clk), 
+               .addr(addr[0]),
                .digit(digits), 
                .out(seven),
                .freeze(buttons[0]),
@@ -196,55 +221,55 @@ module CoreTop(
                                           4'b0100) );
         
        Switches sw(
-               .address(addr),
-               .data(data),
                .clk(clk),
-               .wr(wr),
-               .rd(rd),
+               .address(addr[0]),
+               .data(data[0]),
+               .wr(wr[0]),
+               .rd(rd[0]),
                .ledout(leds),
                .switches(switches)
                );
 
        UART nouart (   /* no u */
-               .clk(clk), 
-               .wr(wr), 
-               .rd(rd), 
-               .addr(addr), 
-               .data(data), 
+               .clk(clk),
+               .addr(addr[0]),
+               .data(data[0]),
+               .wr(wr[0]),
+               .rd(rd[0]),
                .serial(serio)
                );
 
        InternalRAM ram(
-               .address(addr),
-               .data(data),
                .clk(clk),
-               .wr(wr),
-               .rd(rd)
+               .address(addr[0]),
+               .data(data[0]),
+               .wr(wr[0]),
+               .rd(rd[0])
                );
        
        MiniRAM mram(
-               .address(addr),
-               .data(data),
                .clk(clk),
-               .wr(wr),
-               .rd(rd)
+               .address(addr[1]),
+               .data(data[1]),
+               .wr(wr[1]),
+               .rd(rd[1])
                );
 
        Timer tmr(
                .clk(clk),
-               .wr(wr),
-               .rd(rd),
-               .addr(addr),
-               .data(data),
+               .addr(addr[0]),
+               .data(data[0]),
+               .wr(wr[0]),
+               .rd(rd[0]),
                .irq(tmrirq)
                );
        
        Interrupt intr(
                .clk(clk),
-               .rd(rd),
-               .wr(wr),
-               .addr(addr),
-               .data(data),
+               .addr(addr[0]),
+               .data(data[0]),
+               .wr(wr[0]),
+               .rd(rd[0]),
                .vblank(vblankirq),
                .lcdc(lcdcirq),
                .tovf(tmrirq),
@@ -255,90 +280,10 @@ module CoreTop(
        
        Soundcore sound(
                .core_clk(clk),
-               .rd(rd),
-               .wr(wr),
-               .addr(addr),
-               .data(data),
+               .addr(addr[0]),
+               .data(data[0]),
+               .rd(rd[0]),
+               .wr(wr[0]),
                .snd_data_l(soundl),
                .snd_data_r(soundr));
 endmodule
-
-`ifdef verilator
-`else
-module TestBench();
-       reg clk = 1;
-       wire [15:0] addr;
-       wire [7:0] data;
-       wire wr, rd;
-       
-       wire irq, tmrirq;
-       wire [7:0] jaddr;
-       
-       wire [7:0] leds;
-       wire [7:0] switches;
-       
-       always #62 clk <= ~clk;
-       GBZ80Core core(
-               .clk(clk),
-               .busaddress(addr),
-               .busdata(data),
-               .buswr(wr),
-               .busrd(rd),
-               .irq(irq),
-               .jaddr(jaddr));
-       
-       ROM rom(
-               .clk(clk),
-               .address(addr),
-               .data(data),
-               .wr(wr),
-               .rd(rd));
-       
-       InternalRAM ram(
-               .address(addr),
-               .data(data),
-               .clk(clk),
-               .wr(wr),
-               .rd(rd));
-
-       wire serio;
-       UART uart(
-               .addr(addr),
-               .data(data),
-               .clk(clk),
-               .wr(wr),
-               .rd(rd),
-               .serial(serio));
-       
-       Timer tmr(
-               .clk(clk),
-               .wr(wr),
-               .rd(rd),
-               .addr(addr),
-               .data(data),
-               .irq(tmrirq));
-       
-       Interrupt intr(
-               .clk(clk),
-               .rd(rd),
-               .wr(wr),
-               .addr(addr),
-               .data(data),
-               .vblank(0),
-               .lcdc(0),
-               .tovf(tmrirq),
-               .serial(0),
-               .buttons(0),
-               .master(irq),
-               .jaddr(jaddr));
-       
-       Switches sw(
-               .clk(clk),
-               .address(addr),
-               .data(data),
-               .wr(wr),
-               .rd(rd),
-               .switches(switches),
-               .ledout(leds));
-endmodule
-`endif
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