From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Wed, 2 Apr 2008 05:21:42 +0000 (-0400)
Subject: Working RAM :D
X-Git-Url: http://git.joshuawise.com/fpgaboy.git/commitdiff_plain/c87db60a8f262ec834a46432e5d7b9a4faf09e09?hp=ff7fd7f2e78ed70833e58cecc316d5c8d6603349

Working RAM :D
---

diff --git a/FPGABoy.ise b/FPGABoy.ise
index d4a916a..f5e4846 100644
Binary files a/FPGABoy.ise and b/FPGABoy.ise differ
diff --git a/System.v b/System.v
index 033e4b1..dec02b8 100644
--- 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
--- 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