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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,
. T+ ?( K; @% x有大大可以幫我解答嗎??6 ]4 o" f1 w7 o8 ?' Q
9 w8 G1 L& _3 l- T- I- P& ?+ j8 Cverilog程式 : / T" v! e+ T$ b0 ?2 n% l
`timescale 1ns/100ps
' Z, s5 }0 w5 ~module timing(clk, rst, in, out);/ s; s- p. ?: c" H' U1 p2 i
' }2 M1 C' W: j! k0 Xinput clk, rst;
, U* V) \: k! p3 @9 N( }+ cinput [7:0] in;
. v1 c/ N6 Q+ l, Noutput [7:0] out;
! _" K1 J* M/ O7 Jreg [7:0] out;
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8 `5 h6 S m6 k! \8 pwire [7:0] out_temp;5 r1 r9 I' _ X/ E
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assign out_temp = in + 2;
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always @(posedge clk) begin
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* j2 q# i4 W0 i6 f$ C if (rst)
5 b3 A+ K6 f8 ~; S out <= 8'd0;
7 P# R {: k3 Q7 y else ) G5 u) Z N+ r# @' s4 Y
0 F4 u8 D/ ?6 V: j( ] out <= out_temp;
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end9 q4 K) z" V8 g, K
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endmodule
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module test();
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6 Q: P, W2 f( s" ureg clk, rst;
6 C. E. v8 ^: ~8 I% J) B Mreg [7:0] in;& A5 d8 s1 {2 o
wire [7:0] out;
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& B0 f* a( i6 ?. ~/ F- w _* W/ Ttiming timing (clk, rst, in, out);4 ~3 X }% G+ A. o
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8 ~" c, j* {/ s2 Z$ L7 ^initial begin1 X; Y4 d* A R6 S2 m
$fsdbDumpvars;0 [: `! z, j% n+ b2 T) Y
clk = 0;8 w$ M: j# n! {3 D
rst = 1;, K& H9 w3 C' I6 c3 n
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rst = 0;, w+ M7 w! s9 N9 i/ ]; s3 R$ I
#5
6 D W8 N; ~2 `; V0 f in = 5;* v# h/ i/ v6 V2 U; S
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in = 6;
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in = 7;! z7 W# R$ \- {" i7 A0 f( a% S" j
#10
. [, u2 Z1 V7 z% c8 ~ in = 8;
) `* t ]7 J4 U, E7 G; i! H #10
3 @( P9 E/ e) B9 N in = 9;4 Y; M: G7 h. w+ e3 E, p6 s6 L0 L
#500 $finish;: }2 }/ ], e% j3 ]$ t8 m, a: t
end* d5 R$ b* m" ]" N
% i5 u& l( L9 ]5 Q r; Falways #5 clk = ~clk; 5 [6 P) _+ G" F! }! Y5 r+ H) _- \1 p
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endmodule
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以下是VCS與Verilog模擬的圖# Q) i4 a5 m/ b* @' f& y
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) j, q2 O4 r+ M' F( w為什麼會不同??/ p& l& e2 b) t. H
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
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9 D! e- d! Q/ `2 m9 m# Q謝謝.............................. |
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