First cut at timer

[fpgaboy.git] / System.v

diff --git a/System.v b/System.v
index 53e6257f601762ceb5ecd2e27de03eed8c0c029b..a5fee66e243e92a9079e66331d929075fe2e120d 100644 (file)
--- a/System.v
+++ b/System.v
@@ -21,19 +21,22 @@ module InternalRAM(
        input clk,
        input wr, rd);
        
+       // synthesis attribute ram_style of reg is block
        reg [7:0] ram [8191:0];
        
-       wire decode = (address >= 16'hC000) && (address < 16'hFE00);
+       wire decode = address[15:13] == 3'b110;
        reg [7:0] odata;
        wire idata = data;
        assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
        
        always @(negedge clk)
        begin
-               if (decode && rd)
+               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[12:0]] <= data;
                        odata <= ram[address[12:0]];
-               else if (decode && wr)
-                       ram[address[12:0]] <= data;
+               end
        end
 endmodule
 
@@ -61,14 +64,13 @@ endmodule
 module CoreTop(
        input xtal,
        input [7:0] switches,
+       input [3:0] buttons,
        output wire [7:0] leds,
        output serio,
        output wire [3:0] digits,
        output wire [7:0] seven);
        
-       wire clk;
-       //IBUFG ibuf (.O(clk), .I(iclk));
-       
+       wire clk;       
        CPUDCM dcm (.CLKIN_IN(xtal), .CLKFX_OUT(clk));
 
        wire [15:0] addr;       
@@ -93,7 +95,8 @@ module CoreTop(
     .addr(addr), 
     .clk(clk), 
     .digit(digits), 
-    .out(seven)
+    .out(seven),
+        .freeze(buttons[0])
     );
         
        Switches sw(
@@ -106,7 +109,7 @@ module CoreTop(
                .switches(switches)
                );
 
-       UART nouart (
+       UART nouart (   /* no u */
     .clk(clk), 
     .wr(wr), 
     .rd(rd), 
@@ -114,6 +117,37 @@ module CoreTop(
     .data(data), 
     .serial(serio)
     );
+
+  InternalRAM ram(
+               .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));
+       
+       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));
 endmodule
 
 module TestBench();
@@ -140,21 +174,45 @@ module TestBench();
                .wr(wr),
                .rd(rd));
        
-//     InternalRAM ram(
-//             .address(addr),
-//             .data(data),
-//             .clk(clk),
-//             .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));
+       wire serio;
+       UART uart(
+               .addr(addr),
+               .data(data),
+               .clk(clk),
+               .wr(wr),
+               .rd(rd),
+               .serial(serio));
+       
+       wire irq, tmrirq;
+       wire [7:0] jaddr;
+       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),