Peripherals now have internal latches.

[fpgaboy.git] / Soundcore.v

diff --git a/Soundcore.v b/Soundcore.v
index b2c4d35288f8f87897115d36cad85a44418741ea..70c4db1f5dab5794196e02bf7bb3f97690d93ad7 100644 (file)
--- a/Soundcore.v
+++ b/Soundcore.v
@@ -12,9 +12,9 @@ module Soundcore(
        output reg snd_data_r
        );
 
-       reg [7:0] nr50,nr51,nr52;
-       reg [3:0] pwmcnt;
-       reg [4:0] cntclk;
+       reg [7:0] nr50 = 8'h00, nr51 = 8'h00, nr52 = 8'hF0;
+       reg [3:0] pwmcnt = 4'b0000;
+       reg [4:0] cntclk = 5'b00000;
        reg [13:0] lenclk;
        wire [3:0] sndout1,sndout2,sndout3,sndout4;
        wire [3:0] right_snd =
@@ -29,14 +29,19 @@ module Soundcore(
                (nr51[7] ? sndout4 : 4'b0);
        assign sndout3 = 0;
        assign sndout4 = 0;
-
-       assign data = rd ?
-                        addr == `ADDR_NR50 ? nr50 :
-                        addr == `ADDR_NR51 ? nr51 :
-                        addr == `ADDR_NR52 ? nr52 : 8'bzzzzzzzz
+       
+       reg rdlatch;
+       reg [15:0] addrlatch;
+       
+       assign data = rdlatch ?
+                        addrlatch == `ADDR_NR50 ? nr50 :
+                        addrlatch == `ADDR_NR51 ? nr51 :
+                        addrlatch == `ADDR_NR52 ? nr52 : 8'bzzzzzzzz
                      : 8'bzzzzzzzz;
 
-       always @ (negedge core_clk) begin
+       always @ (posedge core_clk) begin
+               rdlatch <= rd;
+               addrlatch <= addr;
                if(wr) begin
                        case(addr)
                        `ADDR_NR50: nr50 <= data;
@@ -47,8 +52,8 @@ module Soundcore(
                cntclk <= cntclk + 1;
                lenclk <= lenclk + 1;
                pwmcnt <= pwmcnt + 1; 
-               snd_data_l <= (pwmcnt <= left_snd) ? nr50[7] : 0;
-               snd_data_r <= (pwmcnt <= right_snd) ? nr50[3] : 0;
+               snd_data_l <= (pwmcnt <= left_snd) ? 1 : 0;
+               snd_data_r <= (pwmcnt <= right_snd) ? 1 : 0;
        end
 
        Sound1 s1(