X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/01878f5fdca9d08e4cf7ceed7f5a39f4df602de4..f8c46ff554cb7f4c067eab1234faf729118c4c25:/Sound2.v

diff --git a/Sound2.v b/Sound2.v
index 2bb9598..ef38263 100644
--- a/Sound2.v
+++ b/Sound2.v
@@ -24,15 +24,20 @@ module Sound2(
 	reg [3:0] snd_out = 0;
 
 	assign snd_data = en ? snd_out : 0;
+	
+	reg rdlatch;
+	reg [15:0] addrlatch;
 
-	assign data = rd ?
-	                 addr == `ADDR_NR21 ? nr21 :
-	                 addr == `ADDR_NR22 ? nr22 :
-	                 addr == `ADDR_NR23 ? nr23 :
-	                 addr == `ADDR_NR24 ? nr24 : 8'bzzzzzzzz
+	assign data = rdlatch ?
+	                 addrlatch == `ADDR_NR21 ? nr21 :
+	                 addrlatch == `ADDR_NR22 ? nr22 :
+	                 addrlatch == `ADDR_NR23 ? nr23 :
+	                 addrlatch == `ADDR_NR24 ? nr24 : 8'bzzzzzzzz
 	              : 8'bzzzzzzzz;
 
-	always @ (negedge core_clk) begin
+	always @ (posedge core_clk) begin
+		rdlatch <= rd;
+		addrlatch <= addr;
 		if(en && wr) begin
 			case(addr)
 			`ADDR_NR21: nr21 <= data;