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我用VCS與Verilog-XL模擬下面的程式結果輸出波形不同,
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4 [ F2 I( c, k$ N, w1 M/ v3 Sverilog程式 : " [3 g; P" s6 \; _
`timescale 1ns/100ps
5 Z! f: Q5 v# w6 F2 Y5 j3 Ymodule timing(clk, rst, in, out);- l. I$ n c" j$ M* W
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input clk, rst;
- l0 f( N+ F; E/ k% t7 Ninput [7:0] in;
( J1 b6 W; {: n U2 Soutput [7:0] out;+ X& y) U5 q: X0 K) Y5 k
reg [7:0] out;
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- D6 y" T3 r; g2 T9 Zwire [7:0] out_temp;, U3 R+ G+ r' A$ w% ~
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$ [. } @3 ]9 s6 b9 a+ gassign out_temp = in + 2;
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always @(posedge clk) begin' s/ T b+ P; v/ R
, I) H# N+ P; A R! y if (rst)! c. D. F- W5 M$ J
out <= 8'd0;4 L& n4 e7 _- p4 V/ N$ [0 J
else ; l0 L, o6 s( Z1 }7 ?, Y7 M
9 r/ [* A2 A4 w% `2 j1 H, f9 p3 h out <= out_temp;
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end2 M7 A3 P1 e" Q
( Y* F: P1 z# F9 \+ Bendmodule5 V6 o4 a6 R# y. \, o
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module test();. J$ z* r$ o% u5 {% F- i2 c6 z
9 ~, R; Y' r8 ?6 D' a6 areg clk, rst;7 x& t' U/ Q _$ n+ w5 q, r
reg [7:0] in;
& ~) z4 e" \) y4 i- ]7 Zwire [7:0] out;
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timing timing (clk, rst, in, out);: K# g0 z; r3 m7 ?
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initial begin8 L8 L9 o) E6 O7 S, @3 h; z
$fsdbDumpvars;
0 _6 N9 D0 \+ D* |5 v; K clk = 0;
+ Y( h$ u# _( b1 q F3 }8 l rst = 1;. I% q8 j' i, Q8 I+ @& Z
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rst = 0;, q/ p' i" N7 N/ B( l
#5
& N' G- C5 \8 S3 `1 T in = 5; ]: V: p1 a7 w6 \ \, }
#10
, C: _' _$ Z1 D" J5 D in = 6;( e! n! E' k" Z+ [6 F4 g7 b
#10
& V3 S3 }) \# h in = 7;
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in = 8;
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in = 9;
6 G1 p x; P D #500 $finish;: Y+ i3 J0 e/ s' N. U2 F4 ~3 g, O
end9 Z2 v5 {6 j, q' W- O0 C, p
% e! a: U& L+ F, c& oalways #5 clk = ~clk; 4 \* t# b+ Z4 w0 y1 M% Z! I, S0 h
" V5 z0 v0 f K4 u$ Bendmodule
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, k% c0 E: U$ ~+ I以下是VCS與Verilog模擬的圖- h) B9 n/ s4 H8 _. M! J) a3 i
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/ { a. w" j; k& ]1 _ B; n o為什麼會不同??
, H c( C) J+ E0 e0 c各位大大請幫我看看
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PS: 我不是要交作業啦,只是在Simulation遇到問題; C4 j; D1 [, i5 o2 y1 `
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謝謝.............................. |
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