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發表於 2008-5-2 12:44:58
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比如說我的code如下:
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, x6 ? z& v1 N+ q4 Emodule firo( run, Dout);
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input run;
5 G& g6 h" B$ t+ _2 F+ b, noutput Dout;0 s; [7 W* O; K0 Z1 f
! C* d9 F4 L* E S3 `wire run, Dout, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12;. y7 a8 z8 K: A) l9 b$ q* O
wire w13, w14, w15, w16, w17, w18, w19, w20, w21;6 {3 K N8 l+ o" k: } T5 `8 z
* I3 ]2 T( d* v2 z3 q* D$ i1 g0 @nand na1(w2, run, Dout);5 U9 ^6 T0 ]1 I/ M) m4 p2 q! q
xor x1(w3, w2, Dout);
8 T' J' R+ Z' N7 G2 W' unot n1(w4, w3);) ?* @) f9 F7 Y, B0 v. e/ v1 f0 l7 H
not n2(w5, w4);6 P# t8 W& C4 F2 h5 o5 D2 a4 Q
not n3(w6, w5);
1 L, K: x% c! b8 q5 inot n4(w7, w6);/ T, T2 R! b k4 _
not n5(w8, w7);$ V% L7 g2 ^ g/ O: N5 c: O: P
not n6(w9, w8);& c# A0 W, w% D! G2 r4 }+ n/ c
not n7(w10, w9);
; a4 K; j1 F$ }9 ?: `8 sxor x2(w11, w10, Dout);
3 i, h* z% S* `$ gnot n8(w12, w11);
: {) |2 C4 L0 c& R+ Ixor x3(w13, w12, Dout);; ]7 m. B* k- M& q
not n9(w14, w13);- g1 F* j! l% U% a/ J' M! j- T" r
xor x4(w15, w14, Dout);
1 }8 u. A3 C, x8 k. U) Pnot n10(w16, w15);
# L: d: T" {5 i- hxor x5(w17, w16, Dout);
% g3 T' _1 ~/ h. S) y, E% Onot n11(w18, w17);9 G5 s1 q% \- ~* D8 g& P
not n12(w19, w18);
" L2 z- c( V3 j5 nxor x6(w20, w19, Dout);) [) u1 e' R h' J" K# G3 b! c
not n13(w21, w20);
% V" {/ r: }+ l/ Y8 K' P1 d ?1 Ynot n14(Dout, w21);2 } ?0 s( b/ v5 o
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endmodule
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那我要怎麼加所謂的attribute 才能夠keep我的電路呢?+ z" s0 u& k; @
不好意思,因為對此不甚熟析,希望大大能夠做個範例指導,這樣對初學者的我能夠較快上手
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