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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,
3 Y1 @. Y% ]3 T; s" \有大大可以幫我解答嗎??
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verilog程式 : 3 D- x: N3 \3 q! x
`timescale 1ns/100ps
_) C7 e% j9 a, D- H, tmodule timing(clk, rst, in, out);
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input clk, rst;) B: C1 u- O3 G0 p8 Z
input [7:0] in;' I3 S& N& q$ }. m/ _: b) Z
output [7:0] out;6 Y: a0 C+ _7 [% J$ o# p, q1 z
reg [7:0] out;/ m4 W/ j# d% M1 O6 x( k
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wire [7:0] out_temp;/ ]) y! c5 G" c
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assign out_temp = in + 2;
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always @(posedge clk) begin
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9 X% c# M3 a; J. G if (rst)
8 [3 r* w" Y( f7 D7 k out <= 8'd0;
% o, g3 j/ j( O% s* U5 t else 3 [* q; `* b( K3 D) x6 Q/ r* ~. U
6 O" o/ k- g4 P7 ? out <= out_temp;
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. q# E3 N( Y9 _+ t3 [* nend
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8 {7 i+ T' |. F/ A d0 v: S6 Hendmodule
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6 [) Z8 x u) p0 W: q# G( omodule test();0 K6 P4 T% j( s3 Q4 H
! F" m* |+ V$ n: \& @; @( y/ \reg clk, rst;
0 M3 h: s% t! I( hreg [7:0] in;
1 g- S" s% j; z+ C3 pwire [7:0] out;
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- _' P- |. A2 [' I8 k+ |4 e6 W7 xtiming timing (clk, rst, in, out);1 L; r0 s$ e; `
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initial begin
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clk = 0;
/ F$ f1 Y; i# V1 v: f8 j) B rst = 1;
5 S- T% Z% S: M; `9 X #20
3 |1 i/ R0 F& s- a# ^ rst = 0;
4 g4 [' a' o' ~" @9 _ #5
" g! {! ?5 [) `9 ?; ^ x0 c in = 5;
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in = 6;
3 j, }: r" m) d4 f3 x- T# K! W #10
! `$ J2 \3 v0 V% T0 N; n in = 7;
. y5 V& S1 Y! d* q+ i+ m #10
3 X8 A2 H2 G* }* V in = 8;
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in = 9;0 }9 x* v8 _( K* n9 u" d
#500 $finish;. Z7 o* f: N# N: d
end
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always #5 clk = ~clk;
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& {7 h4 ^3 U5 t------------------------------------------
2 q1 _8 P' o! y# `- H" [+ x0 [- q以下是VCS與Verilog模擬的圖
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: [3 }: k: n8 [' w1 E0 ]為什麼會不同??
! l4 Z' e, J( X) d+ `各位大大請幫我看看
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0 Y, A0 _1 _- ~* M0 N7 EPS: 我不是要交作業啦,只是在Simulation遇到問題/ t0 r3 Q3 Y* u4 B$ _) K: u( f
' T9 `5 ~+ o8 X# i2 K+ i謝謝.............................. |
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