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LIBRARY ieee;
9 f8 ^4 d6 ?: @& R. ?$ p0 H( [. w4 rUSE ieee.std_logic_1164.all;
; i2 v0 O2 n2 ]1 ]4 kUSE ieee.std_logic_unsigned.all;4 g/ p5 M) b( K+ h( n
ENTITY counter_backwards60_seg2 IS
" r* A0 G8 u9 f PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
) J! V* W8 v; }: q& b/ G' S Ring : OUT STD_LOGIC;
( Y' x. }& i* O! { Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ; , F6 x8 k% M% J( I( N4 H
END counter_backwards60_seg2;
4 S4 ]' T: n& Q6 H% @4 ZARCHITECTURE arc OF counter_backwards60_seg2 IS
% X0 K5 r9 {: k4 Z! O0 G BEGIN2 B) `0 D" ^# \7 P- I
PROCESS (Clk)
+ h: E+ w& u. q; v2 G VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);
# a& G* M( R/ Q8 \ VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);1 P$ A3 T3 t9 j
BEGIN8 ~6 f% y1 P, h2 l
IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";
+ j: z' J4 t0 n ELSE IF (Clk'event AND Clk='1') THEN ' L4 p8 ~0 l$ K
IF Load='0' THEN imper1:="0110"; imper0:="0000";
" [' b- X9 U0 O( O% w ELSIF Ena='1' THEN
) _& T, y% z0 b K7 D; R+ U IF (imper0="1001" AND imper1="0101")THEN1 P1 `8 H- u* X1 P+ S9 c8 W" W$ r& \
imper0 :="1000"; 4 N6 A0 X; v0 W1 N7 x" j
ELSIF imper0 >"0000" THEN imper0 := imper0-1;, X0 ^- E5 [7 `$ V, C- b% N- ]
ELSE imper0:="1001";/ ^- n# C: l3 Z0 P G
IF imper1 >"0000" THEN imper1 := imper1-1;
# _& e2 ~& ]4 y! E. q" ?" D ELSE imper1:="0101"; ! ?0 W1 B% H; d6 u# d- Z
END IF;
0 o: ~# {* U, H END IF; ! D+ J' m( P* }1 C
END IF;0 T* w1 M/ C6 C4 x3 K
END IF;
: v7 @/ g `8 h( s1 ?3 O9 ]) l( b END IF;
8 C: v( O# |. u. |3 v! dQ0 <= imper0; Q1 <= imper1;
6 p7 |4 P0 g! Y$ L2 K8 K3 _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));
2 a) R- `: O: y% G; H END PROCESS ;8 z5 k! C9 {; C: v
END arc;
# T! S+ T9 b7 Z! t
: j3 m9 S* S9 k2 t3 _上面是我的倒數60秒程式
6 v+ a0 d Z+ _小弟不才) G, o4 ?( ~0 U% A. `
不知道怎寫停止
, O2 I/ `( G1 M/ A只要數1次60就好 |
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