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我也來寫一個: `/ t( t f$ @; z6 f3 W
輸入：clk, rst4 O% M; I3 x& @8 ^8 s% @+ r
輸出：tens(十位數), units(個位數)
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code :
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module BCD(clk, rst, tens, units);
! {9 r$ L. Z) C+ E5 `( J. ` input clk, rst;% Q& J- a; `& j: e
output [2:0] tens;
* t6 h. }4 s. R2 {" D( N output [3:0] units;+ b, R8 Y j& t1 u K
reg [2:0] tens, xtens;" ?6 r( H4 i0 E3 p' |+ S
reg [3:0] units, xunits;
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always@(posedge clk or posedge rst)! K+ I' [, s2 O
begin
. \6 P( X1 k$ C if(rst)
: N; n5 F8 f7 B, p9 l2 g# o begin0 S0 {( T4 B& l0 ?
tens <= 3'b0;) \7 W+ G- |- z; }+ @
units <= 4'b0;
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else
8 m$ J3 o Q _, m9 [+ ?; ` begin- H" m* n3 N: m8 M3 ?1 a: I. I
tens <= xtens;1 J! W. n, ] n" L6 @4 v: K
units <= xunits;
; j$ O( m" \0 H3 k: p end
K- |8 g2 r+ b4 i* C/ G" M- L* Z' ` end }8 b% I3 J. V+ z
( G* S9 V8 A# v& Z/ M' M always@(tens or units)
3 {4 j6 ^ @% E. R& K4 U( d begin; B9 s# j8 x+ s+ `) k. E
if(units == 4'd9)
7 H: X/ i4 b q/ H) |& v$ R begin: V$ c4 Z! m, S# {
xunits = 4'b0;
' t! g9 c" W1 B; P, t xtens = tens + 1;8 x4 w' H3 V; k" I
if(tens > 3'd5)5 p' y C& C. h3 E
xtens = 3'b0;/ ` z3 K$ T$ R6 i) \
else! k6 R* O. K C5 \3 e4 \- o
xtens = tens;
) ?2 L7 Q) x4 M$ | end
0 b! c3 l! u; P# A. ` else
! H) Y2 D" T% Q' a) G begin& w2 M5 F: g: M: y& ]5 P
xunits = units + 1;
6 T- `7 `5 Z& B3 G& _0 U- P* ~ xtens = tens;9 X( I/ b$ ?: K# q6 P( [0 Y
end h' s8 T/ k( Y0 W% P) V6 Y' }
end
- e3 }5 f# g6 M3 ]/ z& p0 Jendmodule |
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發表於 2012-5-23 18:01:34
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