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LIBRARY ieee;
* C/ f$ {) `! l) S6 j2 m4 c PUSE ieee.std_logic_1164.all;
. {- r; `7 Z1 S. {3 {+ P( @% V7 \USE ieee.std_logic_unsigned.all;
$ i& G$ i2 B |" P% Q' uENTITY counter_backwards60_seg2 IS$ ^* f3 \- F* N2 ~: k, ]
PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;: t5 W) p1 t4 Z0 i
Ring : OUT STD_LOGIC; 7 _4 Y# ~2 b) O1 S) ]9 `
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ;
- w7 j, I7 {- w, qEND counter_backwards60_seg2;
. ~+ F, F+ L& `- p0 Y' z- UARCHITECTURE arc OF counter_backwards60_seg2 IS
- K& z4 c, F8 }4 X7 Y; ^ BEGIN
! R/ f' B+ m6 M) {; } PROCESS (Clk)0 t0 \# O- m* N3 z
VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);
$ a* h1 a( q( h3 l* J* Q VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);
2 e$ V9 i. I+ [% F2 |! B BEGIN& X9 S9 @4 Z. P! `
IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";7 P0 F0 R+ O' E. e4 B. x
ELSE IF (Clk'event AND Clk='1') THEN
; h* x& u! i9 E1 \4 q IF Load='0' THEN imper1:="0110"; imper0:="0000"; 8 P% A& f, w7 E7 h* W) Z: E
ELSIF Ena='1' THEN
6 S! u9 L6 S; |( ? IF (imper0="1001" AND imper1="0101")THEN
) r: \6 M: N: v, A5 f imper0 :="1000"; - a8 K8 i) ^% r) y% l
ELSIF imper0 >"0000" THEN imper0 := imper0-1;
1 S `/ W# E9 m& B3 ^ ELSE imper0:="1001";
& L: G8 W4 }, k+ e- l; }# \- n- N6 ] IF imper1 >"0000" THEN imper1 := imper1-1;! D8 z+ K' l1 h0 q, m; g
ELSE imper1:="0101"; 1 D4 [& h# {8 g9 g
END IF;
* e! t' Z+ O, L# S3 d3 q6 T END IF;
1 p6 E2 t( X1 L5 f3 ^ n END IF;
, P' e/ }; K# ` END IF;( d- p/ B9 I) A7 Z* b$ T4 t7 H6 s/ M6 F
END IF; ! J7 f8 E M; X1 i
Q0 <= imper0; Q1 <= imper1;
; z( q8 A0 v) D: aRing <= not(imper0(0) or imper0(1) or imper0(2) or imper0(3) or imper1(0) or imper1(1) or imper1(2) or imper1(3));
% r: \+ |; K/ K0 V- A# H END PROCESS ;2 f% r6 _* X+ t) `, k
END arc;5 h# w, Z0 z& P2 }( d
2 E! m& m* _$ J0 R上面是我的倒數60秒程式% y) W7 ]" j1 o! n" n% r
小弟不才
4 T: y$ b3 ]6 S6 L5 v! K- x不知道怎寫停止
* R, ]5 d+ f( A. `/ R只要數1次60就好 |
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