Working RAM :D
authorJoshua Wise <joshua@rebirth.joshuawise.com>
Wed, 2 Apr 2008 05:21:42 +0000 (01:21 -0400)
committerJoshua Wise <joshua@rebirth.joshuawise.com>
Wed, 2 Apr 2008 05:21:42 +0000 (01:21 -0400)
FPGABoy.ise
System.v
rom.hex

index d4a916a..f5e4846 100644 (file)
Binary files a/FPGABoy.ise and b/FPGABoy.ise differ
index 033e4b1..dec02b8 100644 (file)
--- a/System.v
+++ b/System.v
@@ -21,19 +21,22 @@ module InternalRAM(
        input clk,
        input wr, rd);
        
-       reg [7:0] ram [8191:0];
+       // synthesis attribute ram_style of reg is block
+       reg [7:0] ram [2047:0];
        
-       wire decode = ({0,address} >= 17'hC000) && ({0,address} < 17'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)
-                       odata <= ram[address[12:0]];
-               else if (decode && wr)
-                       ram[address[12:0]] <= data;
+               if (decode)
+               begin
+                       if (wr)
+                               ram[address[10:0]] <= data;
+                       odata <= ram[address[10:0]];
+               end
        end
 endmodule
 
diff --git a/rom.hex b/rom.hex
index 6d9f1d9..a37d956 100644 (file)
--- a/rom.hex
+++ b/rom.hex
@@ -8,15 +8,15 @@ df
 50
 06
 00
-cd
-23
-00
 2a
 b8
 ca
 00
 00
 e2
+cd
+23
+00
 c3
 0a
 00
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