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LIBRARY ieee;
7 o; h+ p5 y' ?$ @- A0 nUSE ieee.std_logic_1164.all;5 a% d, c! r: v9 x, z
USE ieee.std_logic_unsigned.all;
% i8 N" @1 o4 ~' K6 a) O1 L7 VENTITY counter_backwards60_seg2 IS
' A4 Y; d2 S4 @5 z$ h PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
) K4 J' i+ @2 T3 B$ L: y% H Ring : OUT STD_LOGIC;
( t+ x* U; {) w, V3 D Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ; # o L+ V. g: _$ y1 r/ V: z
END counter_backwards60_seg2;5 m# \% m5 m7 z9 g
ARCHITECTURE arc OF counter_backwards60_seg2 IS3 N$ h2 Z/ E0 {- s
BEGIN6 B5 a+ `( C" P; D. R( h
PROCESS (Clk)* h& k7 M' D8 Q6 R( u: V* R4 b
VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);- r/ e. j4 `) p5 ?+ V# W' w
VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);! N' _4 s2 [, t6 B8 l9 X+ ^. c
BEGIN6 e) {6 J: R0 j: @. H* K4 L" O
IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";
: ^+ g& x6 ~( v9 D/ M ELSE IF (Clk'event AND Clk='1') THEN / h" R) |; Y4 i; ]8 t
IF Load='0' THEN imper1:="0110"; imper0:="0000";
4 `3 b$ E# i# \& q" F. n ELSIF Ena='1' THEN
) f6 }- E+ f& \. E) h( y8 `9 g% s IF (imper0="1001" AND imper1="0101")THEN
2 s% T2 h6 A0 g* r0 P( j imper0 :="1000";
) U. u8 c! f" _ ELSIF imper0 >"0000" THEN imper0 := imper0-1;2 g) M1 h; j3 j" I) u/ m' L6 p
ELSE imper0:="1001";
' c& d5 O% z! q3 e: o6 R) [6 W4 u# F IF imper1 >"0000" THEN imper1 := imper1-1;9 Z5 f# O! K+ k/ s, [ ]& B
ELSE imper1:="0101";
* ?& _) n# n5 L END IF;
$ V Y3 V- ~4 Z END IF;
! _ q3 v% w2 A1 k END IF;
3 `# O% t. C7 v2 H END IF;% L+ ]# z( B. t8 E1 v7 D s
END IF;
0 V l5 Y: S3 g. LQ0 <= imper0; Q1 <= imper1; $ q6 l* c/ B3 F/ _& P r
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));
" X% N% |- p f; K8 Y/ f9 U6 N; Z5 O$ d END PROCESS ;
2 a0 l& n/ ~# p" K4 R' H- lEND arc;
4 Q- F3 A# _7 b2 w
" f' a& c' W9 o9 B+ Z/ Q上面是我的倒數60秒程式
' u$ E+ J' _& J9 j2 B小弟不才/ K7 X% t2 ]) K
不知道怎寫停止
! U* h+ _ p+ X4 Y$ d" \只要數1次60就好 |
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