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網路上有些Debounce程式你可以參考; o H- _% e6 r. N# q" S3 l q
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// Pushbutton Debounce Module
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module debounce (reset, clk, noisy, clean); ^: w/ W# j4 d, Y$ }4 M/ ?
input reset, clk, noisy;( ]" H( ^, w e' Q# m
output clean;
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1 _" c9 B5 t: h& {, h% a g6 t parameter NDELAY = 650000;$ |( ~" L& {$ o3 Z0 i3 Q- l
parameter NBITS = 20;0 W" }( }$ B' m
3 V, s" [9 {; N9 A7 P; t( V& k reg [NBITS-1:0] count;- F. c6 L4 {" _& P, ]. V% G
reg xnew, clean;$ X* Z5 f" a' A; q* W4 S. g$ o: M
5 V6 `+ d: [) E6 E0 k' z* F- ]+ @ always @(posedge clk)
, A% p( U6 U) C; h if (reset) begin xnew <= noisy; clean <= noisy; count <= 0; end; G( L5 P9 n4 Z% q* [# i3 Q; s
else if (noisy != xnew) begin xnew <= noisy; count <= 0; end
' D7 e8 \# A# R0 U' W4 K) \9 n( w else if (count == NDELAY) clean <= xnew; `6 `2 g2 O7 {' ~; c6 f
else count <= count+1;
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endmodule |
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