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發表於 2008-10-7 19:33:22
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LIBRARY ieee;
! j% G& z; a. P# D6 }( S. h: l+ M+ ]USE ieee.std_logic_1164.all; USE ieee.std_logic_unsigned.all;
; Y9 k, ~+ g, h. oENTITY counter_60_seg_v IS
+ f$ a/ {9 x+ T1 O% y" O) Q PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;2 s' b( {( F/ R0 P6 Y1 ?9 o
D0,D1 : IN STD_LOGIC_VECTOR(3 downto 0);5 r" q6 D3 F0 _$ P8 |2 r
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0);
& r. G0 M% Q8 J5 r+ U1 l6 u: A6 c Co : OUT STD_LOGIC);9 j3 z2 L$ S' v0 E
END counter_60_seg_v;" l! j& O; G8 k1 V1 Z+ _ g
ARCHITECTURE arc OF counter_60_seg_v IS- |; U, ~: k3 g- T7 y3 S- U
BEGIN
2 j7 T% K$ o( G PROCESS (Clk)6 {2 a: m# o3 \" h5 z8 ~
VARIABLE imper0,imper1 :STD_LOGIC_VECTOR(3 downto 0);5 B. m8 }7 O$ }" y
BEGIN
" [$ l3 I7 X; U1 P4 X+ H. t, }7 b IF Clrn='0' THEN imper1 := "0000"; imper0 := "0000";1 C7 g/ a% o$ b/ n( t
ELSE IF (Clk'event AND Clk='1') THEN
5 a3 y" \3 F; @5 H8 L) J IF Load='0' THEN imper0 :=D0; imper1:=D1;
9 r7 L5 P2 u- c1 X" ]) o7 g ELSIF Ena='1' THEN0 U7 z1 O% R5 q. W2 K+ c
IF imper0="1000" AND imper1="0101" THEN
}" b! \7 c6 Z imper0:="1001";. i& _9 A5 D) y# q% ?$ w2 E _
ELSIF imper0<"1001" THEN imper0 := imper0+1;
" \! |; u- k I/ f U/ J ELSE imper0:="0000";
" b: ?0 J8 [& w/ \ P IF imper1<"0101" THEN imper1:= imper1+1;2 Q; { w6 h. y3 p2 ~ D
ELSE imper1:="0000";
1 k' U( u5 ?! Y: j1 y1 [& i END IF;
4 H1 T, r# U$ r: t# k* F END IF;
) F2 i, J% c# p' r3 |' Q/ u! z END IF;+ k. d1 g# W# O) A9 c
END IF;
( C$ [6 g$ R, s: k# N END IF;: s1 E/ f5 O6 C! A5 Z3 U% f3 ]
Co<=imper0(0)and imper0(3)and imper1(0)and imper1(2)and Ena;
9 h' U2 X/ E2 [$ ^3 P8 | Q0 <= imper0; Q1 <= imper1; ' }$ S% W: j: m1 Y: p$ e. y2 n
END PROCESS ;
! G$ K) ^/ i$ Z; BEND arc;
3 T! S0 ]$ U' {9 \! g* Y8 S1 w
7 Z6 l* j( m( U* D% O$ x這個是60模計數器設計8 X: K% L( u% ?. m+ ?; s
要怎弄成倒數60?
* `/ Z% V* s2 }- S, P有人會用成倒數60秒先幫忙吧" a3 j4 B _! Z7 a/ w
請問一下我會用到幾對幾的多工器啊 |
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