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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,% i9 X5 t- v# R' ]5 j0 g
有大大可以幫我解答嗎??
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2 y3 V8 C" k6 _8 Dverilog程式 :
( @( |& m V( d- z. n- u6 K`timescale 1ns/100ps
9 _3 v& m8 E2 V# X9 _module timing(clk, rst, in, out);
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1 b, u+ Y& ?* i, V5 J4 Linput clk, rst;2 W6 Q) M- ~" Y
input [7:0] in;
! G, o$ ^* T0 K) [) ?3 zoutput [7:0] out;
. \) |1 @) @& N7 c1 Areg [7:0] out;
8 k' W( d1 ^4 ~* D3 P
2 F6 t6 G- D9 @+ zwire [7:0] out_temp;
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* J5 }+ p! ?# E0 h! @5 a+ yassign out_temp = in + 2;
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2 t( D* T: n2 m% c5 g2 _
$ x: N( | S% }" _always @(posedge clk) begin
# w1 `1 B- N4 `. U" W9 F 4 O7 D; a4 [5 [& w( U$ p) b
if (rst)4 [5 X0 \, f$ J! j% |9 q
out <= 8'd0;
/ U5 d; S7 U; W; s/ O& y else
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8 ?- n3 Q0 o2 w out <= out_temp;
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end1 o9 A) E8 K! I% n# M! U6 X
3 l$ X+ Y' I" d) s3 b- t: @: xendmodule* v% C2 v Q) U5 f& v) ^. r
3 ]. ?+ m( d$ c: r
1 ~ D: U6 C# B/ x- l: kmodule test();
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8 f$ T; B1 K+ z" @$ V Treg clk, rst;
) w2 G5 @6 a1 A5 Rreg [7:0] in;
" h3 k9 b" z3 n: Q3 p6 {5 Dwire [7:0] out;5 N, f9 B+ b" y
( m4 D" \# H; r+ xtiming timing (clk, rst, in, out);, W: j B; P& c2 k6 m! l& C. V2 {( s
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initial begin
b* x) {1 @/ r7 [ L $fsdbDumpvars;
' C) d! K: q; @# w& O% {1 G. y clk = 0;
# O/ y" Z! C( p rst = 1;
5 t, _; l0 [0 C- n #20
" C5 Q0 l' A7 @& m rst = 0;! @% A6 e3 l+ O8 E: a* O
#5
7 n/ a1 N: ?- b( C, Y4 A0 A in = 5;. G! C( H6 ~ N `9 ~% z3 i8 }
#10# x; k3 B) s W, h8 L
in = 6;! ]) d* K$ S3 `4 V$ c
#10
; k& c- [ x' }2 { in = 7;
8 j( I: R7 |. L5 |$ n #10
- @2 U- {( Z- ?3 C in = 8;3 c5 n* Q4 t" D3 _( U6 F6 Y
#101 ~* K0 {9 X S% ]% X
in = 9;3 H& w/ z% C+ X! t' K. ]+ o7 ~: q6 `7 S
#500 $finish;
8 Q1 \' O' q6 u2 F" D( ~7 ]end
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5 ^! e3 n! v+ Z& q2 K) _always #5 clk = ~clk;
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endmodule0 p/ X+ G% v5 J }' n
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------------------------------------------& |3 [) i7 m8 V
以下是VCS與Verilog模擬的圖
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為什麼會不同??
' G" F9 m% B# A/ o! F各位大大請幫我看看
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3 x9 U8 C: H3 F# D. t3 uPS: 我不是要交作業啦,只是在Simulation遇到問題( I( ~9 v u8 `* F/ Z
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謝謝.............................. |
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