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//可直接透過synthesis tool用於PLD，FPGA不可 LUT delay則要採其他方式。$ F) O. R* F1 ?/ M: B3 G2 ~
//所有註解都要保留
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! a7 c! }' Q4 n" {3 F' M2 n`timescale 1 ns / 1 ns& D8 @+ Y1 d. n9 W5 e' L
module xclk(sclk,ena,set,outp);
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( ?6 s0 ]+ V3 E7 k6 a, p0 `4 cinput sclk,ena;* m& i# J# {. B1 z* Q
input [1:0]set;% s. ?, G0 ]0 o0 b7 H1 X
output outp; - n! {, O& L) Z4 `8 a% M
7 y9 X1 W# `) H# U& Vwire outp;
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/**** Node preservation for nodeA **************/& \$ @# u8 a% b1 M" H6 u c
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, o; ~9 s! p/ H4 V//exemplar attribute nodeA_5 preserve_signal true8 t6 D8 E5 F. S' o7 P9 d+ j
6 D9 k p8 I3 r* q$ K//exemplar attribute nodeA_4 opt keep E$ h5 i5 h% M% ?' ^1 Z' V9 ^3 y; @
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/**** The following comment form also works ****/
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5 H8 s2 M2 M g3 @% i* i//exemplar attribute nodeA_3 preserve_signal true9 D+ p8 G: { h8 ^0 @$ z; V2 e8 g
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//exemplar attribute nodeA_3 opt keep
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8 Q$ E) O3 h0 W/ t. X! _) x/**** The following comment form also works ****/- s8 a5 T4 Y8 ~& q
; b" p+ S. _% _. t//exemplar attribute nodeA_2 preserve_signal true
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//exemplar attribute nodeA_2 opt keep$ m. `* q0 L N: ]) F
. X) Q. @) i) j3 J( x/**** The following comment form also works ****/' N; g5 i& \: E' c" t! z- n
8 E% a: H+ ^5 k7 w& l! Y' B% C//exemplar attribute nodeA_1 preserve_signal true
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//exemplar attribute nodeA_1 opt keep
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/**** The following comment form also works ****/0 [( m x, y; w b' Y
* @9 [; h1 Z( A- M) e \; w/*exemplar attribute nodeA_0 preserve_signal true+ O4 H8 q H' Z" j4 p3 N9 s
3 \/ T0 \5 f$ N; hexemplar attribute nodeA_0 opt keep*/ * Z M- W+ L3 E' @8 w+ ~
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- ?, p+ n4 P! F- z. Qwire nodeA/* synthesis syn_keep=1 opt="keep"*/;) i) ~! k! D/ r
wire nodeA_0/* synthesis syn_keep=1 opt="keep"*/;2 z# {' E) C- G2 N
wire nodeA_1/* synthesis syn_keep=1 opt="keep"*/; P/ d& y- Q+ g2 t2 @/ H" j
wire nodeA_2/* synthesis syn_keep=1 opt="keep"*/; D x, y; g" ?, Z! E
wire nodeA_3/* synthesis syn_keep=1 opt="keep"*/;4 U6 _4 G% C, {' E$ M% S
wire nodeA_4/* synthesis syn_keep=1 opt="keep"*/;, z& ]+ G( t/ g+ B5 |
) z p- y. h$ E6 z) N6 D7 sassign#1 nodeA_0 = sclk & ena;" F5 U8 t" x {8 `
; s% @' H* n5 q/ G: h* Hassign#1 nodeA_1 = ~ nodeA_0;9 c) r( m6 z( d( k- s
assign#1 nodeA_2 = ~ nodeA_1;
4 }0 L. r4 ?3 t- C5 L0 ~+ z) fassign#1 nodeA_3 = ~ nodeA_2;
1 _: _2 k3 b7 M9 Z8 Eassign#1 nodeA_4 = ~ nodeA_3;
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reg xout;
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# _& M$ Q4 Z# b& P# |* _always@(nodeA_1,nodeA_2,nodeA_3,nodeA_4,set)
' @+ t2 Q, M- I- h" s. L0 z casez(set)
/ h0 F4 s+ S% R6 m3 R: j M8 a 1: xout =#1 nodeA_2;4 T' J" s) w, x7 f4 {2 c9 W
2: xout =#1 nodeA_3;
2 v+ K1 T9 |' B% E8 e4 P N3 s* D 3: xout =#1 nodeA_4;2 B1 L- @$ _. q. D2 J
default: xout =#1 nodeA_1;/ T: h9 D: P* ?# O1 N2 D
endcase
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assign#1 nodeA = xout;
- P" ?+ f, V% p. }' massign#1 outp = ena ? nodeA^sclk : 1'bz;
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( E* E2 Y2 J+ dendmodule
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`timescale 1 ns / 1 ns9 T5 P R0 C% B! K
module xclk_tf();
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3 K, }7 R% m3 I0 s8 H1 q! |3 b7 l: i// Inputs' C; |; I6 {% X h1 J l
reg sclk;
' L) H1 T2 W% Y/ K reg ena;
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// Outputs; B. C8 f0 V1 o' ~! L" x7 E
wire outp;5 u" o; [( R% u' T' m0 {5 k
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' ?8 }: V1 s. e1 ~ xclk UUT (
6 M4 x; P0 O0 S1 z" w .sclk(sclk), 9 F+ c" Y! R# W. E) g! `7 j" q! G1 U
.ena(ena), 7 ~4 w) w4 U# |! ^
.set(set),
' Z# Y0 {9 V( v) x .outp(outp) D, l1 R' z* X+ l/ i7 e. g
);
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initial begin# }! o$ W7 B: E0 s1 f( ?6 m( j
sclk = 0;; d' I6 @/ `+ t! i+ \
ena = 0;
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end
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% i$ ?( h2 O: oalways# 5 sclk = !sclk;
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, l9 ?% }7 ?0 \& qinitial begin8 D( n1 o$ V6 _0 m* G
#100" A$ R ?9 [8 k4 V) [) d* @6 g
ena = 1;
, k* V; x. _) V; ]( @ #2000
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$ G3 ] A% A" b% b #2000 $ W/ {4 H+ t, c- h i6 f
set = 3;) |9 s( [. m+ S* K6 b5 T
#2000
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end' C3 A8 c2 r; k O; d! i7 h
endmodule // xclk_tf |
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發表於 2007-6-10 21:50:08
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