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LIBRARY ieee; * B* M9 d* L4 u0 F/ @
USE ieee.std_logic_1164.all;
- A+ h1 l1 l2 G. r0 Q0 A; e' [- p! EUSE ieee.std_logic_unsigned.all;! B& h. R6 ?# y! Q( l9 Y1 @2 d
ENTITY counter_backwards60_seg2 IS, \: Y3 K6 ^% L# e
PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
- r8 N1 K+ ^# x k* j. N( I Ring : OUT STD_LOGIC; , g7 I/ D q$ e9 v9 F6 \, z
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ; . Y0 G8 v% U4 g; R7 U+ |
END counter_backwards60_seg2;
0 W, a0 W. F& V2 CARCHITECTURE arc OF counter_backwards60_seg2 IS2 s7 u/ e& f! M Q0 `
BEGIN
) Q/ I$ N/ |4 E+ w* A! Z% t( J8 u PROCESS (Clk)5 g" y; B6 T( L
VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);
! s- n+ x( K5 M5 O6 t VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);
( i1 e' p K! {( r$ n+ p3 C" H- h+ o. L BEGIN
* Q, G ^2 z3 Q' n4 o IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";! ?/ D+ f( t, D( }7 J( Q- e3 g
ELSE IF (Clk'event AND Clk='1') THEN + r. y$ ?# y+ L
IF Load='0' THEN imper1:="0110"; imper0:="0000";
" Z8 b$ B8 u$ `& q+ l ELSIF Ena='1' THEN* A& R3 H3 x# n/ @$ V+ B' b
IF (imper0="1001" AND imper1="0101")THEN+ t! X! s; _5 A" o- n7 }& y
imper0 :="1000";
9 X" j/ i( c' H ELSIF imper0 >"0000" THEN imper0 := imper0-1;! F- C; N! L: h( m) C4 u: e* q- o: K
ELSE imper0:="1001";4 @5 h; a4 d- C
IF imper1 >"0000" THEN imper1 := imper1-1;7 F( d/ w0 \8 J/ r/ E
ELSE imper1:="0101";
' z( A. K6 z; n G8 @# Y" N END IF;/ r! i/ x6 ^7 s: u
END IF; % y. t$ ]' `2 k" W; I
END IF;- b+ k( c* q" Q2 m% ~3 e8 U7 ~
END IF;
7 }. |1 B$ X5 N% X& g4 u8 B END IF; 0 W" m6 K5 C% S+ M- e# m [! M4 e
Q0 <= imper0; Q1 <= imper1; 2 O) N2 T. P' u) G" w6 G( t
Ring <= not(imper0(0) or imper0(1) or imper0(2) or imper0(3) or imper1(0) or imper1(1) or imper1(2) or imper1(3)); / @3 R) |8 Q: s* |6 a8 x. `3 B
END PROCESS ;
! l7 d* d7 w, L* G; q, bEND arc;; f/ W& F. y. X# A1 w( ~" V0 O
1 s% H/ I9 c" D/ J4 K: ~: ~, f上面是我的倒數60秒程式/ A# n, M: {+ f6 i$ M5 Q
小弟不才
3 W/ C# c8 O( x' w不知道怎寫停止
6 X/ Z7 x" J( C+ k只要數1次60就好 |
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