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發表於 2008-10-7 19:33:22
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LIBRARY ieee;
/ t" D( d" E5 j/ IUSE ieee.std_logic_1164.all; USE ieee.std_logic_unsigned.all;2 d- O# `! }8 W* L
ENTITY counter_60_seg_v IS
+ z! y' k8 L7 z' s' Y PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;3 Z5 Z# N! E, x) B
D0,D1 : IN STD_LOGIC_VECTOR(3 downto 0);
0 u9 c' G: f' g8 y Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0);" C* A1 ] f7 i) d; {) r
Co : OUT STD_LOGIC);
! C0 s$ r$ e5 Z' i1 EEND counter_60_seg_v;
0 J# \: L) c( W5 g$ p0 s7 QARCHITECTURE arc OF counter_60_seg_v IS
5 \! @+ c$ S2 M6 W3 N' M/ T" n BEGIN
' n* C3 K3 _ ]3 j# D8 B0 X PROCESS (Clk) R j+ e2 n/ Y& J- V
VARIABLE imper0,imper1 :STD_LOGIC_VECTOR(3 downto 0);/ ?) M5 \! w8 T+ h$ i6 ]
BEGIN' R6 @ D( u2 R' J# Y y8 C
IF Clrn='0' THEN imper1 := "0000"; imper0 := "0000";2 f K' e0 x0 Q' I: h
ELSE IF (Clk'event AND Clk='1') THEN
; F5 F1 G3 d* I2 E% _8 p9 L( R IF Load='0' THEN imper0 :=D0; imper1:=D1;: g T( K3 C' P: T$ o. B6 g0 Z( p
ELSIF Ena='1' THEN
8 h! B' w/ G8 @+ L5 M6 ^8 ? IF imper0="1000" AND imper1="0101" THEN 1 y) ^$ r# M b1 ]* I# I
imper0:="1001";, G9 @' {5 n. s* x2 C
ELSIF imper0<"1001" THEN imper0 := imper0+1;
5 X( G# P0 | C" H ELSE imper0:="0000";
L; D' Y, c4 G9 [ IF imper1<"0101" THEN imper1:= imper1+1;
% l) _3 S& S8 f+ g/ r7 } ELSE imper1:="0000";
& i3 {' n2 ]8 [% \' U END IF;! C& h$ P% i, }, B2 m) _
END IF; 6 x* R! M: e3 }+ G; a
END IF;. h# g; x6 S# i# ~
END IF;
% R3 P! G. r* l. ~" }1 { END IF;
7 A$ t4 i0 e2 m$ U8 J3 c9 U Co<=imper0(0)and imper0(3)and imper1(0)and imper1(2)and Ena; 1 _9 B2 @6 k. ^ z9 e6 u8 R
Q0 <= imper0; Q1 <= imper1; 3 @. z( H) M* |9 m& B
END PROCESS ;& i. @/ }7 p$ y( s1 ?# R7 s
END arc;3 x0 R. u5 Y1 f
1 j; |0 m- U3 f) f2 E
這個是60模計數器設計
2 l' [1 {# Q2 j% a" _3 c7 k8 k- ^要怎弄成倒數60?! {" y: O: _+ U+ @+ W4 a
有人會用成倒數60秒先幫忙吧& z: e) s5 E2 d1 l- S
請問一下我會用到幾對幾的多工器啊 |
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