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網路上有些Debounce程式你可以參考) b9 M8 G- ]- I" L. R8 ^
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3 {2 d3 g! ?5 N6 t& Y; Y, r// Pushbutton Debounce Module
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module debounce (reset, clk, noisy, clean);2 l, Y, X/ S5 ~) w
input reset, clk, noisy;
6 w+ @/ s/ J3 |% T" L+ n$ m) t output clean;
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1 ?# \( }5 Y/ V V) D6 y4 K4 _ parameter NDELAY = 650000;
# c! D" h, L; m& P0 O( B parameter NBITS = 20;# I5 S8 l% O! d/ t2 h& R
: T& l, B6 U! i+ {& I6 n& p reg [NBITS-1:0] count;9 m+ b" C" `4 H7 f9 o
reg xnew, clean;
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always @(posedge clk)! o4 Y1 c7 _" N3 ]
if (reset) begin xnew <= noisy; clean <= noisy; count <= 0; end4 _& F+ c- w7 N r
else if (noisy != xnew) begin xnew <= noisy; count <= 0; end3 L6 V3 L# T' Q6 ?1 P% c% f
else if (count == NDELAY) clean <= xnew;
7 y3 @( x3 O0 ?) t0 T else count <= count+1;1 K3 Q5 Q# \ {& h6 y; Q: W+ q
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endmodule |
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