想請問關於這個晶片中的程式碼是在敘述些什麼(急)

winds77322

不好意思
想請問關於這個晶片中的程式碼是在敘述些什麼
他有什麼功能


" y* X& W7 [5 Q; g1 ^define rom_size 6'd8
9 ?3 O4 H6 q1 i) n7 V3 d, S: {
& L, {5 R9 y( smodule CLOCK_500 (
CLOCK,
CLOCK_500,
3 T) k3 o- y: `/ `DATA,
$ d" X- T8 B" K! p" ZEND,
RESET,
9 s, O8 g# Q: j% W8 iGO,
  q% @& D) E! Q: lCLOCK_2
);
( i+ }! A$ \& [% [input CLOCK;
% c( N: _' m' f0 \( x' jinput END;
6 p1 Z. R- v- z( y/ t, _input RESET;
output CLOCK_500;
( S! S8 @! E5 ioutput [23:0]DATA;
# r2 s6 e& }: B( s3 A4 doutput GO;
  s( ?7 L$ J5 B% k* houtput CLOCK_2;


& E% n. F( M, R8 V9 ]! vreg [10:0]COUNTER_500;

wire CLOCK_500=COUNTER_500[9];
wire CLOCK_2=COUNTER_500[1];
" y& U9 ^( i9 [4 ]+ J
1 `' z  p9 O  m1 e4 preg [15:0]ROM[`rom_size:0];
reg [15:0]DATA_A;
reg [5:0]address;
! Y# `" I0 M' Pwire [23:0]DATA={8'h34,DATA_A};
: E5 \; x! _% e9 \
wire GO =((address <= `rom_size) && (END==1))? COUNTER_500[10]:1;
always @(negedge RESET or posedge END) begin
1 {" S/ b6 V# w# @/ _, |# O& Wif (!RESET) address=0;
else
# b/ z5 a5 g& c$ T9 c, Uif (address <= `rom_size) address=address+1;
end

: E: L7 b$ U2 g6 G  L1 lreg [7:0]vol;

& b( @' X% |1 S8 M( P2 ?% J' w1 Y) xalways @(posedge RESET) begin
vol=vol-1;end
5 J' ~/ Z0 @0 L$ c! U  Z
3 x0 ?) ^, z5 M) [
always @(posedge END) begin
//ROM[0]= 16'h1e00;
2 I: Z9 d1 a* oROM[0]= 16'h0c00; //power down
) R; K5 A- h2 [5 ~9 k$ U' TROM[1]= 16'h0ec2; //master
  z+ t* Q  a* _1 N# B! jROM[2]= 16'h0838; //sound select

ROM[3]= 16'h1000; //mclk
! H4 b0 d7 e2 k8 U8 X, F) U
ROM[4]= 16'h0017; //
ROM[5]= 16'h0217; //
ROM[6]= {8'h04,1'b0,vol[6:0]}; //
ROM[7]= {8'h06,1'b0,vol[6:0]}; //sound vol

8 G7 t& U" Y, I& q: S. s//ROM[4]= 16'h1e00; //reset
ROM[`rom_size]= 16'h1201;//active
DATA_A=ROM[address];
end

always @(posedge CLOCK ) begin
8 k$ m; H+ Y4 v( M% _2 ^  jCOUNTER_500=COUNTER_500+1;
end

endmodule

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