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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。
, G/ q: Q7 _- P8 c- n//所有註解都要保留! @3 \1 d( j3 W0 y) F
) E$ Q d! S4 w2 k9 l3 e`timescale 1 ns / 1 ns4 j' _9 D0 t! k, s+ N: y- H
module xclk(sclk,ena,set,outp);
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0 w" n) F2 R C( g5 o7 A0 S0 }input sclk,ena;4 P! q: r8 U# H+ F/ r! F
input [1:0]set;
" `9 Z7 o& |2 N; W, N* w1 routput outp; 8 T0 A5 S; [! }1 b% g
. v5 y, p+ E7 N8 y" [2 q \, Rwire outp;) f" `- V) K6 |4 `. X' P" ~ T
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/**** Node preservation for nodeA **************/
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//exemplar attribute nodeA_5 preserve_signal true1 M0 o* i$ y" K
) G8 N5 e! w# O1 I" {& P//exemplar attribute nodeA_4 opt keep& K8 Z( N3 E6 e5 L
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/**** The following comment form also works ****/
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3 q' e6 n$ H9 S x* x% ~ T6 q* Z//exemplar attribute nodeA_3 preserve_signal true9 I9 r6 Q' B3 n* n1 }# b( q! O
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//exemplar attribute nodeA_3 opt keep
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; p0 {7 w0 d$ N) ^5 G+ f8 _/**** The following comment form also works ****/
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//exemplar attribute nodeA_2 preserve_signal true
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0 t) T6 [: `! u1 s' P2 S- V3 o//exemplar attribute nodeA_2 opt keep9 y$ e9 f( t6 z: u: P
2 Z J- s3 |/ ^0 T" {/**** The following comment form also works ****/5 z8 }* \0 r) g
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//exemplar attribute nodeA_1 preserve_signal true
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$ | j1 U+ N7 X5 Q//exemplar attribute nodeA_1 opt keep
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2 b( F* l2 M' W/**** The following comment form also works ****/
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/*exemplar attribute nodeA_0 preserve_signal true
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exemplar attribute nodeA_0 opt keep*/ . q8 c/ b( k1 d4 O3 Z
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9 N: G5 R; U3 v0 ywire nodeA/* synthesis syn_keep=1 opt="keep"*/;
9 w! H h# p8 r6 |5 nwire nodeA_0/* synthesis syn_keep=1 opt="keep"*/;
% E( D# M* y/ _+ Kwire nodeA_1/* synthesis syn_keep=1 opt="keep"*/;
& H8 H, S6 q+ D+ U fwire nodeA_2/* synthesis syn_keep=1 opt="keep"*/;
+ z2 l. H, E+ U/ Pwire nodeA_3/* synthesis syn_keep=1 opt="keep"*/;
) d% ]# R2 y8 B( F6 u6 @& M0 ?wire nodeA_4/* synthesis syn_keep=1 opt="keep"*/;" |" B4 C( p# P, x7 [ }( G
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assign#1 nodeA_0 = sclk & ena;9 N, I4 F' l( D q
$ M" F$ V; g* r6 Fassign#1 nodeA_1 = ~ nodeA_0;
% _& l1 Z$ p |9 B; `- s! [# jassign#1 nodeA_2 = ~ nodeA_1;
& g( D) D* H( ~0 G" ?6 {# massign#1 nodeA_3 = ~ nodeA_2;( r+ r+ h' c1 r) n; x. t/ I
assign#1 nodeA_4 = ~ nodeA_3;
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, b8 [) \! Y L' L/ U% S; ~reg xout;. L* o$ k& B* A% K
5 F& |, x: e0 [" u/ J- @& e$ Q7 _always@(nodeA_1,nodeA_2,nodeA_3,nodeA_4,set)# G4 }. P& ?7 @$ h" U
casez(set)
" A2 ^& P3 Z3 i 1: xout =#1 nodeA_2;
/ D2 D% m: O/ m3 W5 t 2: xout =#1 nodeA_3;
2 ]* D5 r) e0 h2 q; _ 3: xout =#1 nodeA_4;6 N7 g3 \3 x2 f# G' b
default: xout =#1 nodeA_1;* A: g n( b" F' W& V9 _' _8 P s
endcase3 t2 w9 r. G8 U2 M
H, n& P2 Z* `; d: w, ?$ gassign#1 nodeA = xout;+ q+ R d7 ?3 W' N! Q, g+ N3 T
assign#1 outp = ena ? nodeA^sclk : 1'bz;
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endmodule; k# s" v. v3 s. F, ~& m
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`timescale 1 ns / 1 ns
" y- k" |9 p: Y7 H$ w! Smodule xclk_tf();, R4 t, C5 M! `, D6 r+ i
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// Inputs
0 c- B" Q: i5 \% R1 g; ?8 W9 \+ O! k reg sclk;8 G2 H3 v" Z; G& T5 K2 U9 A
reg ena;
" A# b( j0 _6 q1 R reg [1:0] set;* y+ d9 N; b* w, p& F# `
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4 R3 g: {5 @6 \$ q// Outputs
* h. i# M5 q" B6 M0 U6 H7 e9 |+ z wire outp;" P- O; @' E+ X2 Z* j
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* x, B0 S6 L6 d- r" N- j xclk UUT (
, [ |* o( a. ?3 {( x .sclk(sclk), # G: L* D% V% T: |1 w2 d8 X
.ena(ena), + A1 e" g, h; L/ e
.set(set), 7 o8 Z0 s8 b s! B
.outp(outp)
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s' Q$ f9 T" k h/ Y! @7 H initial begin, S) y5 Y( k, ?" ~: g, D5 r% ~* I
sclk = 0;
/ c S! @) D8 @8 ? ena = 0;
k( N$ t* s& B8 Y8 ?# Y* ~, c set = 0;7 r0 {) @! P8 u) z& N1 I9 n
end1 Y" h/ O; j7 P1 c- Y ]
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always# 5 sclk = !sclk;
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; {, q7 l5 O9 n. pinitial begin5 t, T5 N8 p* j( [' H' _! O! a
#100- L3 t" M' _. g/ X
ena = 1;( h9 v% p& g' X' u. i P
#2000
4 B' D* i2 k* E3 j3 w2 V5 T set = 2;- M4 `( T4 w' q1 a: y1 S/ U. N
#2000 % h; U& r n% n; i9 |3 I k" ?
set = 3;* w* d/ l* P6 C" x6 L
#20009 p+ x% g j8 Y! Y& J6 I! e+ j
$finish;6 U6 P) C( w% |
end
/ p# A2 v* j" \- o- Zendmodule // xclk_tf |
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發表於 2007-6-10 21:50:08
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