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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。+ o) y, u1 w2 E& e, a! T# z
//所有註解都要保留& B( B& }: p3 j b1 A
w+ k& v0 M* J* I- v% [8 A' y`timescale 1 ns / 1 ns
. V2 Q, ?8 o& `: Y9 l" Y9 Wmodule xclk(sclk,ena,set,outp);/ A+ w5 l1 Q- @- x8 S2 Z
/ ^4 K# K; L p: p9 b ]
# x: o- T7 f" V0 u$ l5 K1 u3 Y) c: ^( x1 s- X
input sclk,ena;
- f# Y8 H) k0 s- K3 h0 Y: g% linput [1:0]set;
0 {# M8 R1 X K+ D' u: t/ coutput outp;
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wire outp;
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/**** Node preservation for nodeA **************/
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//exemplar attribute nodeA_5 preserve_signal true' D$ W3 @. u% g2 g- G5 |
4 a: ^: H7 Z4 L8 L3 }6 Z# [//exemplar attribute nodeA_4 opt keep
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/**** The following comment form also works ****/
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//exemplar attribute nodeA_3 preserve_signal true3 E' {6 |. ]# M
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//exemplar attribute nodeA_3 opt keep
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- |5 y1 a+ p/ w/ [: i* c, s4 p/**** The following comment form also works ****/
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//exemplar attribute nodeA_2 preserve_signal true
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//exemplar attribute nodeA_2 opt keep {$ t, t6 I, R, f( M
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/**** The following comment form also works ****/# X5 N* P2 ?1 m
- A1 a+ v5 b; @3 c E3 m//exemplar attribute nodeA_1 preserve_signal true/ U: ~1 U! F. Y( ?- u- B
) v0 j/ [1 X: {1 L//exemplar attribute nodeA_1 opt keep; b$ W2 G# h4 C
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2 M8 l! ^; S; H# m+ B8 B/**** The following comment form also works ****/
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/*exemplar attribute nodeA_0 preserve_signal true
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! Q, o! D& |) v9 ]2 Z& Nexemplar attribute nodeA_0 opt keep*/
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% L* e6 U- F% h+ G' ~6 g4 y( Mwire nodeA/* synthesis syn_keep=1 opt="keep"*/;
! E+ J. n/ t( Y) J3 Q. vwire nodeA_0/* synthesis syn_keep=1 opt="keep"*/;
. k$ B6 E( y: A" c7 Pwire nodeA_1/* synthesis syn_keep=1 opt="keep"*/;
& @4 l2 C) G7 H* @2 k0 N* @7 o6 q( owire nodeA_2/* synthesis syn_keep=1 opt="keep"*/;
' T+ X- `2 ^, i! ^wire nodeA_3/* synthesis syn_keep=1 opt="keep"*/;
& Q2 ^8 k% y5 `: B8 J% Jwire nodeA_4/* synthesis syn_keep=1 opt="keep"*/;
+ g q9 W# H# S- I! ]( B
3 S: h) w: ?4 _' k' rassign#1 nodeA_0 = sclk & ena;
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assign#1 nodeA_1 = ~ nodeA_0;
! H9 ^# x: I Sassign#1 nodeA_2 = ~ nodeA_1;
! r" G4 K r! m! |# ?+ |assign#1 nodeA_3 = ~ nodeA_2;
0 n1 f9 v5 I cassign#1 nodeA_4 = ~ nodeA_3;0 G- v8 o: c) Q3 H, b
* M2 I- X" ~( hreg xout;* F8 ~6 A% s( M/ R& Z6 O
7 G. {0 N% S3 w/ G" ?7 \always@(nodeA_1,nodeA_2,nodeA_3,nodeA_4,set)
) _/ W& V5 b7 l9 o; e n casez(set)
! ?6 G# [+ a" |" n1 u2 r; o- I+ _ 1: xout =#1 nodeA_2;
. H& Z0 E) d' k& t4 T4 z5 V 2: xout =#1 nodeA_3;
' ~5 X6 T! L {: I7 d3 o5 V$ ? 3: xout =#1 nodeA_4;9 @+ t& T! T7 t, G# x9 D( e3 }8 v2 x
default: xout =#1 nodeA_1;
) j9 \" N; f8 S8 V, J endcase u! ~* B: `3 J
2 j, N, M! `4 rassign#1 nodeA = xout;
`* s% h E7 Qassign#1 outp = ena ? nodeA^sclk : 1'bz;6 k3 y! q; [4 `9 {
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endmodule2 t4 Q& o$ S; c" ]) h
m6 T5 a9 x4 I" f) T/ B/ }2 n& o9 V/ q
* }6 H; h {# [( ]: t' N`timescale 1 ns / 1 ns
4 d4 [9 i1 P( I: Q$ }* E+ Qmodule xclk_tf();4 ^; I& D- g& e1 w; g( q+ b
0 g+ p8 w; q8 t// Inputs
( T- O) l4 l" R6 i reg sclk;
/ M( H5 S4 d7 r( u* L6 j ^4 z) S& c0 F reg ena;
7 o/ [, b/ I& y3 N reg [1:0] set;
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// Outputs# ^( J3 h0 J- C8 F
wire outp;1 A# N E1 ^ D5 t
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xclk UUT (
b" b1 c `, v' G .sclk(sclk), - \( ~8 S. R) x0 B ^/ c6 A% V9 ~
.ena(ena),
/ F& E/ r- C; W7 V& E/ U .set(set), $ c g; R0 s7 q7 n2 r
.outp(outp)
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initial begin5 _7 B/ e+ V, L, K! E2 D
sclk = 0;
. a/ u" h. e% n7 l7 W- j ena = 0;
/ P1 t7 _" B. S# _' o6 s set = 0;
6 F$ t# v% C6 h6 V2 m) I3 p. a. K end. d0 A) l& X; y5 a# c. B& d
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& J1 B# [, a5 Ialways# 5 sclk = !sclk;
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initial begin
5 D- b! Z# U4 q3 Y! E1 S #100
& ?8 m& x9 y" U$ N7 g7 {" w ena = 1;# p) @0 e% h' @7 e1 k, r
#2000 0 H3 @9 F/ n8 y! B# r4 [8 o
set = 2;
1 \ @. L5 g& H% X #2000
$ e7 w v% [6 L `/ C. {, F set = 3;
; U8 z( g* W$ ?& r #2000" B3 |% k: v" o
$finish;
( t8 M4 b8 |7 w* q) n, _9 fend1 L* O; E. i7 V8 Z$ j9 ], i$ v
endmodule // xclk_tf |
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發表於 2007-9-10 06:26:03
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