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;
reg [7:0] odata;
- wire idata = data;
assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
always @(negedge clk)
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,
+ output wire soundl, soundr);
+
+ 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;
+ wire irq, tmrirq, lcdcirq, vblankirq;
wire [7:0] jaddr;
-
+ wire [1:0] state;
+
GBZ80Core core(
.clk(clk),
.busaddress(addr),
.buswr(wr),
.busrd(rd),
.irq(irq),
- .jaddr(jaddr));
+ .jaddr(jaddr),
+ .state(state));
ROM rom(
.address(addr),
.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),
);
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)
+ );
Timer tmr(
.clk(clk),
.rd(rd),
.addr(addr),
.data(data),
- .irq(tmrirq));
+ .irq(tmrirq)
+ );
Interrupt intr(
.clk(clk),
.wr(wr),
.addr(addr),
.data(data),
- .vblank(0),
- .lcdc(0),
+ .vblank(vblankirq),
+ .lcdc(lcdcirq),
.tovf(tmrirq),
.serial(0),
.buttons(0),
.master(irq),
.jaddr(jaddr));
+
+ Soundcore sound(
+ .core_clk(clk),
+ .rd(rd),
+ .wr(wr),
+ .addr(addr),
+ .data(data),
+ .snd_data_l(soundl),
+ .snd_data_r(soundr));
endmodule
module TestBench();
wire [7:0] leds;
wire [7:0] switches;
- always #10 clk <= ~clk;
+ always #62 clk <= ~clk;
GBZ80Core core(
.clk(clk),
.busaddress(addr),
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