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LIBRARY ieee; 0 K( N, q2 [, @; A! P v7 l" ^6 B" H
USE ieee.std_logic_1164.all;
: D! l8 _% P& h1 x2 S" ZUSE ieee.std_logic_unsigned.all;* N# Q5 t; H2 F. S: _# t1 b3 K
ENTITY counter_backwards60_seg2 IS
) ~7 |& c1 U6 Z PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;6 l6 q+ a) P, w2 _
Ring : OUT STD_LOGIC; 8 q! Z6 t4 _0 P, @6 d- a
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ;
3 X) U8 l5 {7 C% p! V# WEND counter_backwards60_seg2;
& A1 f# @% r. g' V8 G1 O: nARCHITECTURE arc OF counter_backwards60_seg2 IS% [5 q6 D3 Y: U/ O0 l
BEGIN
0 f# }9 n. |% \2 U8 A, }, {! D7 a PROCESS (Clk); r5 e5 ~$ k+ i7 [* S% b& N2 {) Y
VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);- E9 z" \1 Q& D( m- Z) S- I
VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);
8 X) k: h8 W$ k& w5 O# C BEGIN
$ d- L% ^ H* ^- k) P* ~; a IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";: L9 P' z7 _# m' ?
ELSE IF (Clk'event AND Clk='1') THEN ) J# ^2 L1 f* L
IF Load='0' THEN imper1:="0110"; imper0:="0000";
: a' v* `/ R0 M6 ~ ELSIF Ena='1' THEN' Q. J' p# i1 m3 q
IF (imper0="1001" AND imper1="0101")THEN: Y6 ]5 L5 o5 T6 |
imper0 :="1000";
# D& [3 w( l8 K' ~: Q5 I. U ELSIF imper0 >"0000" THEN imper0 := imper0-1;% v; k5 {0 w( S
ELSE imper0:="1001";3 Y Z# P" _) P4 O( R% s/ p
IF imper1 >"0000" THEN imper1 := imper1-1;
, S, I, y. w* R- Z3 d. g ELSE imper1:="0101"; / e! G+ I; A( F+ d6 L5 S$ t/ d
END IF;1 A7 R0 L2 p. u) z' g; f" h/ j# _6 ^( }
END IF; & |; N4 h* m4 k4 U B
END IF;
' T& ?" E w! R2 j8 q4 E6 n END IF;
" Q, P, G. T6 i" ]# [1 P% O8 K2 D END IF; & @( {$ D: S+ l6 n* p, t' V0 g
Q0 <= imper0; Q1 <= imper1;
8 N8 |4 l F9 v0 n: E0 gRing <= not(imper0(0) or imper0(1) or imper0(2) or imper0(3) or imper1(0) or imper1(1) or imper1(2) or imper1(3));
4 t7 K4 n+ i, V: } V- F6 V END PROCESS ;# b& l/ @5 h3 `2 g' \
END arc;
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4 P7 Y$ e, E; C上面是我的倒數60秒程式* r' O& Q5 k8 {" E, B$ ^6 e, v ~
小弟不才
3 k8 U. Z) I) z8 z不知道怎寫停止
* u7 x1 Y' q! ]; P* i/ }只要數1次60就好 |
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