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不好意思
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想請問這晶片中的程式碼內容3 D+ w& j; U+ A
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說明他有什麼功用3 F0 c/ b* A* Z$ s8 @( r; I/ ?4 }
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謝謝9 @ @' ^4 d' e+ O0 V2 l
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module keytr (0 v! c' l+ k% p& N( B5 L
key,
2 `; ^2 [7 E" ]5 NON,; p0 Z; P$ m. P5 E8 ]
clock,4 U7 T+ v/ X8 {( o
KEYON,, p: x- k* s; |( O5 h+ l
counter- j+ ~/ L, o( s# ^1 R `$ O
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inputkey;% g% l3 { P: `1 i, _
outputON;* |% u4 l' Y- G! ?
output KEYON;2 f- R7 t8 d F7 a3 o
inputclock;
5 C- n. D; U! `* t! s2 routput [9:0]counter; j8 J3 C1 m; q, J+ _" c |
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8 V b7 g' l" M. rreg [9:0]counter;! l; S6 t. Y9 R2 S# F/ D$ r/ h N8 M
/ o) o5 Y8 x+ l( e! v9 n% p: lreg KEYON;" s% d7 e1 l3 L3 Y5 P7 f
wire ON=((counter[`OUT_BIT]==1) && (key==0))?0:1; 5 m) Y4 x& u9 v) {7 ]3 v
8 e9 G) K; |& h' R" {always @(negedge ON or posedge clock) begin
# @. F, j3 w: x( eif (!ON)
; Y1 H5 l2 l# y7 Kcounter=0; & k4 S* D: r) r, b0 t& Z
elseif (counter[`OUT_BIT]==0) P# B; p/ m, @, F* A7 h
counter=counter+1;+ {0 s! K# o0 |: i
end) y3 e$ a0 {/ E1 l0 w- g
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always @(posedge clock) begin: k# a$ w) R: N
if ((counter>=1) && (counter <5))
' S0 }3 S: V, `0 s3 F5 nKEYON=0;
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7 q& a9 m" E4 O( |0 w& TKEYON=1;
, O* t7 _0 `5 t: Tend9 w+ j9 z' g- X: X3 i0 Z
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" R; |. g+ ~- D; e* f+ y0 `endmodule |
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