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LIBRARY ieee; % j& D9 `% l3 F0 W! ?
USE ieee.std_logic_1164.all;
0 Q/ i1 e# E8 E, LUSE ieee.std_logic_unsigned.all;
! B5 h) l9 N0 j G5 G6 ^- ^0 OENTITY counter_backwards60_seg2 IS
4 K1 Z8 e, A" J' t1 S PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;2 }9 U* v% } Y" B4 D' m; T5 d4 w
Ring : OUT STD_LOGIC;
: [: q8 ?$ y2 L% x+ A! ~, ]' J N Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ; * S0 ^ E& V0 v
END counter_backwards60_seg2;9 H) m, F3 C# K( t
ARCHITECTURE arc OF counter_backwards60_seg2 IS
F8 E) H/ a+ B BEGIN
& \8 i# I G9 m% D! U PROCESS (Clk)/ B( P$ P4 s1 g. f; v; O
VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);; b+ Y* W6 I' U( ~/ Z
VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);
/ J3 X3 y2 J( `6 k BEGIN6 x0 t8 V3 p2 Z) I6 C {" U
IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";: L, o" _2 p4 D: u8 c0 @. p
ELSE IF (Clk'event AND Clk='1') THEN
+ D$ D% E- B9 M# \ IF Load='0' THEN imper1:="0110"; imper0:="0000";
+ l: ~+ z' f0 K. E ELSIF Ena='1' THEN+ p: p6 o% Z5 C4 ]
IF (imper0="1001" AND imper1="0101")THEN
6 T$ X6 k9 `5 B3 E imper0 :="1000";
4 B3 h L+ _2 P: m! w1 _2 P: t$ l ELSIF imper0 >"0000" THEN imper0 := imper0-1;/ G- W) O) c. y2 y: E. {( [3 u
ELSE imper0:="1001";4 \/ i2 E8 T7 J, B* }
IF imper1 >"0000" THEN imper1 := imper1-1;
2 u! Y" k; {* S! F ELSE imper1:="0101"; 6 T. ?. |, D! A7 {( }' W' P
END IF;7 `# n) V" A2 L$ Q
END IF;
# Q3 {- O( g9 X% C0 u END IF;
6 D4 S% x3 A; R* r, {$ b END IF;( m, I9 Q6 w, {2 ?4 c
END IF; 7 W9 ^. A, y% F! o' D i
Q0 <= imper0; Q1 <= imper1;
, @/ l+ G2 I1 F+ x5 q' ZRing <= not(imper0(0) or imper0(1) or imper0(2) or imper0(3) or imper1(0) or imper1(1) or imper1(2) or imper1(3));
7 ]" v0 _$ @* d$ y- A$ } Q9 L END PROCESS ;: q2 G- P }* F
END arc;8 g1 f6 L$ V" A4 M' h$ | n: L4 Y* E
& ?9 L+ E3 p5 u
上面是我的倒數60秒程式7 r T8 V2 A' Z6 J( j1 E* F
小弟不才
& z: [8 \7 [/ L& {不知道怎寫停止
, Q1 c, x {& c8 K5 w只要數1次60就好 |
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