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LIBRARY ieee; , S* D% D/ V/ y: G( ]
USE ieee.std_logic_1164.all;9 ~' g% \9 N2 k9 l
USE ieee.std_logic_unsigned.all;3 J2 w4 @+ b1 P' V
ENTITY counter_backwards60_seg2 IS. D& O& y( }1 x. C+ l
PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
4 s$ a8 H; H' `1 _$ k$ Q Ring : OUT STD_LOGIC; ( L3 c% ^; `" z0 Q: s& D( p/ u$ w
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ; ( T" E7 i$ O5 E% P' d2 @& r
END counter_backwards60_seg2;
$ B& t/ i* X4 {$ E0 EARCHITECTURE arc OF counter_backwards60_seg2 IS
4 w0 g' e( X* n8 e: A BEGIN, L9 \/ f; B8 o1 |6 l
PROCESS (Clk)9 @% e, E* d4 }7 i2 m* K
VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);3 B$ u0 h) S4 t
VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);! n' _7 m- k* f# C8 ~: _: h
BEGIN
3 ~; \! {. \% F IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";1 o; p. D0 f) w* @
ELSE IF (Clk'event AND Clk='1') THEN ; C! h: E' \. D- I+ t6 w0 i
IF Load='0' THEN imper1:="0110"; imper0:="0000";
5 `& \- O# x) Y1 o7 o ELSIF Ena='1' THEN
7 ?/ A* M) F3 e, ]- j% H+ `6 O& F IF (imper0="1001" AND imper1="0101")THEN6 B) A4 F1 o, K
imper0 :="1000";
1 \5 f' p: v, ^: O$ N0 W- M( @9 Y ELSIF imper0 >"0000" THEN imper0 := imper0-1;2 T# U' ?* P3 V( o
ELSE imper0:="1001";
% Y7 c! N$ N9 i2 I8 f IF imper1 >"0000" THEN imper1 := imper1-1;
% I' C3 K1 f' V; z) Z ELSE imper1:="0101"; 2 d0 s9 K% s3 y/ Y1 K
END IF;; [6 k; F$ J% d6 i- C
END IF; % { C% q- N* i- T5 K1 ^9 S0 T3 a
END IF;8 r- m F6 e4 S- {8 R3 i
END IF;
/ d, `1 J. d# |8 S/ {" g END IF;
' z& @* \& w3 N$ @7 _Q0 <= imper0; Q1 <= imper1;
4 R, y1 f+ v, {' 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)); ) q. `- l+ O* M; {
END PROCESS ;
2 A5 o& v2 ?( [6 D- pEND arc;
, R, Z* R7 \4 M1 p0 q
5 p; x: h/ U5 x1 Y7 g) s) W' C: ]上面是我的倒數60秒程式
% T# N4 X4 ~3 e7 u小弟不才9 ^ M/ o) N4 h: T7 U
不知道怎寫停止0 r( u& {1 @2 ~! u" D% J
只要數1次60就好 |
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