TA的每日心情 | 擦汗 2020-1-14 15:59 |
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如何写时钟模块才比较规范合理,大侠给个标准模板吧+ U' @- l: S! k5 d
2 D" x, Y2 M X D4 Z# f`timescale 10ns / 1ns
: s) v L# l0 j2 {: wmodule clktest(
a7 W1 o, a+ t+ f) W clk,& [1 H$ P; _ D: s2 V3 k
reset, w- U' z3 Y1 y Z9 D# |! O5 U4 j
datain,
# p0 ^) O6 J, M7 T! u" | dataout);7 S4 Y! S( e& X) C$ E# \# Q4 t
input clk; + |% H, b7 ~& }/ w5 A; C' ^5 j
input reset;9 a# w% r" s, O3 L$ k
input [3:0]datain;, M+ n& J" M' R6 e
output[3:0]dataout;
/ {- T' \& v5 M- j. ]3 @2 _/ T: r wire clk;
4 r% g( X" @& a# y5 h8 Y9 d- G0 o3 ] wire reset;
, H3 }. E) v! o wire clkout1;
" K$ s6 z1 i) Z. H( C! S wire clkout2;
+ y+ p2 |! W; d+ \( t1 p% d wire clkout11;
5 b8 \4 q6 W$ X% f/ D& b% L wire clkout22;) w5 L. l0 r) J; k+ y8 }
clkgen clkgen(clk,reset,clkout1,clkout2);
) j9 Q. H( j2 q' h8 ~6 _$ Hdatain_dataout datain_dataout(clkout1,clkout2,reset,datain,dataout);
& F: t: q2 `& ?% o& x# M, Pendmodule
, r5 b. }) {0 K; J9 e/////////////////////////////////////////////////////////////////
+ W' F% {/ h7 u' [' ]module clkgen(clk,reset,clkout1,clkout2);
! x$ w3 e. P2 ~7 C+ H; F7 c input clk;3 K! ^0 {' x: W$ ~
input reset;
" ?9 P' U$ r. s. X3 o+ n1 o7 n output clkout1;
" C+ @$ w4 P4 p4 b3 x7 s output clkout2; $ M# ~0 s& T! e& s s& e- {
reg [3:0]cnt;
) D3 C7 F1 ~: u& ? E' q7 _2 }% L reg clkout11;
# }+ A4 d2 \ k$ P" n% P reg clkout22;3 {# F( u1 a u1 W: d
assign clkout1=!clkout11;
) D# v# n# y" Q assign clkout2=!clkout22;$ P( G# j' f; I9 y
5 H, B8 Q7 g8 d; G( |5 w, r always @(posedge clk)begin
8 [9 U8 ~! D, I! d2 n7 \% n if(!reset) z4 h! T: S6 Y
cnt<=0;/ w* X( s: g& I; K9 G5 }
else- x( q% W+ }2 ^5 a, r7 q" F
cnt<=cnt+1;
8 x% l: n7 z3 y end8 u& |9 ~" h( q
always @(posedge clk)
( {* p1 L- [" U! ? r, y begin 3 ~) ?5 m$ N7 Q) w
clkout11=~cnt[2];' V+ m; `, l% t0 T F; l* F+ U% T
clkout22=~cnt[3];
1 ~( O; K9 F, r; X# m# i: F$ i4 B end# O5 g" Q( N' C! G% |5 w! s
endmodule _$ n# k& j! P' z
////////////////////////////////////////////////////////
6 D- |9 F8 h9 t' S) r* ?module datain_dataout(clkout1,clkout2,reset,datain,dataout);/ i; v9 G. ?* V" L4 t
input clkout1;
- ^3 \! k% E: B6 ]+ Q) } input clkout2;
1 c, v0 H5 X- p, K" q input reset;& S8 g2 ?0 |. a2 t! Q- E
input [3:0]datain;
& r; l4 F) s7 X& A" Y# M output [3:0]dataout;
& G' u. Z1 v7 G0 ^6 X% x$ t& ]' x reg [3:0]datatemp; - Z6 ^- n# c" H
reg [3:0]dataout; 1 X& u2 z- u7 E7 d+ }0 S3 T
reg [3:0]cntt;
3 }# P. J, q' q ~0 U always @(posedge clkout2)begin
$ Z! d; u% e' } _' X if(!reset)+ g- Z4 S; r! h+ g
cntt<=0;
# w1 F8 I/ `# B& f else
+ z$ y) H: V7 n3 w" H& \# v2 q7 ~ cntt<=cntt+1;: [. t% _2 e/ [) Q6 ^5 z, u3 j C
end
: M2 z6 D+ t( n! a+ G 4 f- ]+ h) `$ `' f: \) Q5 A
always @(posedge clkout1)begin ) ^- D" X/ A# u
if(!reset)# F3 D# W4 k' o4 Q0 j
datatemp<=0;3 O& O9 h6 ~& |) x6 J
else
$ j. o2 h: r& K9 t7 {4 o& A datatemp<=datain;
J6 t% ~% x7 e) f end0 z/ D- V* O. @# a* v' Z8 ]
always @(posedge clkout1)begin
2 P8 Q$ q0 q* X: s4 b+ n# k if(!reset)
* o( M0 B' k- R0 b9 |1 F dataout<=0;
* z/ t9 F- m, C else
0 c G h0 z( Y) N. E3 _3 w dataout<=datatemp; / V: F$ n# I2 y( J- w! D
end+ c) Y. Q# D( f% y
$ W4 p7 i2 b* Z, {: iendmodule
: B% R) I* B# t" V/ P l8 N; m4 ~////////////////////////////////////////////////
/ t& P0 b; D" j t提示下面的警告:+ G9 J: U3 A0 _$ o' E) x" k
clkgen.v(14): clock signal should not be driven (gated) by inverted logic (clock: "clkout1" (datain_dataout.v(28)); inverted logic output: "clkout1")
# N. i5 i# \3 I; [" v7 }
7 E0 i- Y" k4 I7 a" D# R) B S. q/ F1 P2 Q
clkgen.v(14): clock signal should not be driven by logic which is not in clock_gen module (clock: "clkout1" (datain_dataout.v(22)); driving logic output: "clkout1")- _) P) w( U8 m$ B1 v: ]
5 C* ]' d) {" U: f/ f& e7 L4 c6 L
clkgen.v(25): BLOCKING assignment should not be used in an edge triggered block |
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