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发表于 2008-12-11 20:36
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`timescale 1ns / 1ps
4 g1 x# g; ~! t, o. L; ^& a. v7 g1 Cmodule GreyCounter4 g6 E0 Q9 s: A
(
& E$ L6 s" n4 Z! c- g3 x // outputs:
2 K( Z+ g2 B( d greycount,
# ^ w" T: \2 @( @; q& e, ?
/ E& f& x3 {0 p$ {$ ?/ M // inputs:
, @, k# I, L7 ^; z& X clk,
" K' v K2 q# m/ z( l0 ~ reset_n,4 Y) \- }$ X+ j" f+ U1 }# [! n
en, O6 b% Q( P* C* S7 }' ]) i$ M
clr4 }& ]: O1 b! m) r6 r5 t' [( M
);
7 k& e) O; @4 ]) b! j u; }
8 h; r/ m/ T5 X( B" Vparameter WIDTH = 8;
1 Z6 `# Z& w& D: z( c9 r2 Uparameter DLY = 1; |) k; \" l1 ~; Q4 ~1 J
( h$ B" j) p' z# E8 loutput [WIDTH-1:0] greycount;
8 v6 o3 [/ ^! K9 L5 w
' d6 f7 m, h% L2 rinput clk;
# z3 ]) F1 x3 H+ c einput reset_n;) v, }; S; k6 O. U/ D
input en;8 a9 J1 ]# q/ h$ k. ^# }! P; T
input clr;* }9 u; o- P( p! p7 u( k/ @3 n
9 z0 }* M' ]1 `4 \% l3 `
reg [WIDTH-1:0] greycount;
- O+ J6 ]9 z8 |% k; T9 R4 l0 Dreg [WIDTH-1:0] bincount;; `: o$ w4 |( ^" c/ e: Y
integer i;/ B- T8 P' C6 c" I% x
2 r/ Z8 y& ^ W( `0 K% y7 W k- h" F
always @(posedge clk)
w p/ R! a2 Mbegin
% w" e7 ?( K0 O$ P% V if (~reset_n)* N2 f) G6 q, y( \5 r! L4 U: j( R
bincount <= #DLY 0;
6 q0 Y8 z1 }% S% Q: e else if (clr)
+ {7 I3 f6 g& E% d# K bincount <= #DLY 0;% Y% L) T# s/ X
else if (en)
4 o; S% j% P+ o: R8 ]* q- U bincount <= #DLY bincount + 1'b1;
# z5 G# n# S1 e& i8 g% [ else) _$ P! G. j$ d8 B5 h8 f0 g$ l
bincount <= #DLY bincount;
9 a; b% N, l2 y: u. A0 Y* T% dend' U) ~* C8 ]* p/ n5 _( u
8 n6 U/ \% s, Q$ Y
always @(posedge clk)* d) Q3 K/ |9 c" I
begin) Y9 t, E5 Q2 V
if (~reset_n)0 i9 {2 r' w7 A* Z- B/ r
greycount <= #DLY 0;
& V7 H: J- s, _5 A& L else3 c1 V& e' L3 H+ S+ }$ U/ R
begin5 i% ]* A6 |: ~7 A
greycount[WIDTH-1] <= #DLY bincount[WIDTH-1];
7 s, S, J" E( }5 l+ { for (i=WIDTH-2; i>=0; i=i-1)
& H. ]; L! G" C, e begin2 F1 L0 H* L( j1 F& I
greycount <= #DLY bincount ^ bincount[i+1];
# D; x" h/ A9 A. N+ u. k& I. h8 D& f end4 W* V/ H4 k. G% s* f4 z/ n
end
N# o( B2 r' [end4 p6 E$ x: Q4 J
4 A, k& Z' f1 D( I7 C1 |+ ^endmodule
8 V( U. |/ _* O3 j' q
# W( D! t9 R3 r; b3 r貌似上面的只能用于激励仿真吧
: H% K# U, i% S3 h* [' p- i6 Gfor循环 ~~！ |
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发表于 2008-12-11 18:50
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