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LIBRARY ieee;
# c& S3 [$ _6 P X+ ]8 SUSE ieee.std_logic_1164.all;
9 M% V# e5 h% ^# m7 FUSE ieee.std_logic_unsigned.all;* K3 \0 @, g. U
ENTITY counter_backwards60_seg2 IS7 y) j4 H/ n! b/ R1 `
PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
- I9 H7 q, v9 u7 C Ring : OUT STD_LOGIC;
3 ~$ U: G$ ], f. o @! ` Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ; - s, ^! W; `0 B9 M3 N q. n K
END counter_backwards60_seg2;
. u: O- V& q1 ?ARCHITECTURE arc OF counter_backwards60_seg2 IS
8 L# \& z( k( G: c0 ]/ t BEGIN4 Q& Q& |2 ~1 W% a& ]
PROCESS (Clk)9 z$ n5 J0 y: G* m0 O j, ]# E1 @
VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);& s; [' i) n L0 ^
VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);
0 @) r% p0 ^1 D5 b$ F! W BEGIN4 F% t$ t! I0 ?, I, S
IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";
. I2 w+ a' N O# H ELSE IF (Clk'event AND Clk='1') THEN # ^' |5 L! C( [* z6 p2 W+ f
IF Load='0' THEN imper1:="0110"; imper0:="0000"; . L' R) j8 R) i6 s9 y2 l1 Z
ELSIF Ena='1' THEN' f) ]2 T- d8 J0 {* g z
IF (imper0="1001" AND imper1="0101")THEN. p1 @( a3 j* y
imper0 :="1000";
1 L$ n! B* {/ m7 V ELSIF imper0 >"0000" THEN imper0 := imper0-1;
6 ]9 P( ]6 d# z$ H ELSE imper0:="1001";( o2 P! ^' I# P5 @9 Y: a
IF imper1 >"0000" THEN imper1 := imper1-1;! F, j, c" \- \" X% F
ELSE imper1:="0101";
+ \& {( O: w% ]' S+ J END IF;& R5 [ g! [# T1 O! t: U4 V7 h
END IF;
& d9 j C# ]$ T/ j, c7 @* q9 d END IF;
! h1 c; r8 t1 }. K END IF;
1 [6 l* K! [ q END IF;
/ L0 {9 u: p" B! Q, @% [5 _Q0 <= imper0; Q1 <= imper1;
# ~2 v/ }4 k: d8 ]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));
8 l; S6 G, M; Q1 @7 ?; p9 J, z END PROCESS ;1 A8 n, Z) \1 a4 H9 v+ J" G
END arc;
/ m9 E2 N0 o: J; R7 t! k3 T0 H9 }1 }$ u1 }4 r$ V9 w- N. H
上面是我的倒數60秒程式
6 f% Z z& ]( ^* y, `- d3 C: O$ w小弟不才; g7 G8 @% h: P+ y) e, G
不知道怎寫停止
. s- v; c, Y* r5 Z5 o x& p- S! B' r只要數1次60就好 |
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