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LIBRARY ieee;
. C5 a% N; Z7 w1 A0 [$ kUSE ieee.std_logic_1164.all;. n; o- ?+ r# \) M! ]
USE ieee.std_logic_unsigned.all;
$ K6 J4 v. S* ^, S2 K/ TENTITY counter_backwards60_seg2 IS
" I0 m- n: W9 j) P0 | PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
5 v. i1 [. p' I t3 t7 O Ring : OUT STD_LOGIC; $ b4 e& |6 E/ Q; r
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ;
+ N7 x* W% K- W, ?END counter_backwards60_seg2; n6 E) q# e0 ~& P5 K$ y+ @$ f/ J' K2 e
ARCHITECTURE arc OF counter_backwards60_seg2 IS, N |$ r" z2 t% W
BEGIN
( T& s$ d. H+ @/ J% P" |/ j, O PROCESS (Clk)( c# U$ M1 A! W1 ~, X
VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);7 Q7 f, N' i) ~ I& I) ~4 T2 q) U
VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);
' o3 g1 ? V$ G' Z+ N* B BEGIN
7 b: T* Y; y0 D) Z9 \, w/ | IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";
K. P q7 S) V2 i1 t ELSE IF (Clk'event AND Clk='1') THEN
\8 C/ z9 a R, j IF Load='0' THEN imper1:="0110"; imper0:="0000";
! i O2 B5 ~3 d4 ]3 Q ELSIF Ena='1' THEN3 p3 X% Q7 @2 y2 b5 _0 i
IF (imper0="1001" AND imper1="0101")THEN
6 S; V5 ?3 ^2 s! i. Z imper0 :="1000";
% d" x6 t( J4 A6 m0 E9 ~ ELSIF imper0 >"0000" THEN imper0 := imper0-1;1 }7 k0 E0 X1 R% m! U' u/ E
ELSE imper0:="1001";
/ _: E, e2 |. N IF imper1 >"0000" THEN imper1 := imper1-1;( ]4 K% P$ d& E$ R
ELSE imper1:="0101"; , Q* b: e4 \1 M% W' H: U7 A
END IF;
" |# v* ?# E1 r3 u END IF; ! L0 b8 R; \) {
END IF;
1 S9 K9 d/ z* M6 F# z* f END IF;7 ~" b: l. K. U' V) X5 G
END IF;
2 l2 ?$ l: F3 ^; p2 @& {) o7 qQ0 <= imper0; Q1 <= imper1; ! g0 u, e- Q3 P
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)); " H% Q+ t* b+ r0 I' z3 E
END PROCESS ;
( p2 M0 s% k- V. J3 [" SEND arc;+ \) v* _7 ^5 ~& ]
8 Q2 ?) u7 o5 F( b
上面是我的倒數60秒程式+ e5 j7 w# f& ]" l- L2 `9 B$ c( k
小弟不才
/ S$ F1 h9 Y1 i不知道怎寫停止
- Z0 ^; d" c' \只要數1次60就好 |
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