X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/68ce013e5fe7c5d1c4e07fe8ba1eb0ba2855b280..6306dc0a42b06b5f253bb9ce6c5307761dcd419a:/Sound2.v

diff --git a/Sound2.v b/Sound2.v
index cf8e83a..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 @ (posedge core_clk) begin
+		rdlatch <= rd;
+		addrlatch <= addr;
 		if(en && wr) begin
 			case(addr)
 			`ADDR_NR21: nr21 <= data;