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LIBRARY ieee; # a% m4 M6 U/ m9 W5 G* v
USE ieee.std_logic_1164.all;0 e) ^- s' \' M x" b; V* W# y* t
USE ieee.std_logic_unsigned.all;
) D+ h* i7 d7 K3 EENTITY counter_backwards60_seg2 IS
6 @; p; M5 S2 x0 H. @5 u PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
: E- Y6 ], ~$ b2 v- R Ring : OUT STD_LOGIC;
8 j# L, ]6 d! V" Q Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0)) ; 4 R4 k* {/ w1 y2 t/ F
END counter_backwards60_seg2;+ J$ _, a0 w; M. U# v2 Y, k
ARCHITECTURE arc OF counter_backwards60_seg2 IS
; P& X" }3 k# o# o, L BEGIN# V9 L; C9 C# [( m. \# g; y3 o
PROCESS (Clk)
0 w8 ]8 ~8 g+ T) S% T8 [ VARIABLE imper0 :STD_LOGIC_VECTOR(3 downto 0);
: E* b/ c7 ^% @( k) p: m% d4 y' N VARIABLE imper1 :STD_LOGIC_VECTOR(3 downto 0);! ~0 v# v. G8 u) n0 V; G, H8 C
BEGIN! e% T6 z: ~8 d: @ [, Y
IF Clrn='0' THEN imper1 := "0110"; imper0 := "0000";; }" n. G! J" E$ L4 r# m# v
ELSE IF (Clk'event AND Clk='1') THEN ' Z! o. w4 C2 I
IF Load='0' THEN imper1:="0110"; imper0:="0000";
7 c7 `6 q3 \& u& b2 W9 _- P2 S1 J# l ELSIF Ena='1' THEN. q1 F/ ?8 G; \2 U* u
IF (imper0="1001" AND imper1="0101")THEN+ M1 [* k0 K) m- ~2 t
imper0 :="1000"; ' E, e4 | N8 k! D+ E l9 F" I
ELSIF imper0 >"0000" THEN imper0 := imper0-1;
2 a$ ~% {( G/ j- y ELSE imper0:="1001";
% G: O# ]$ G" ]8 J% V9 ~ IF imper1 >"0000" THEN imper1 := imper1-1;
/ o5 \& \7 U3 N: n& k ELSE imper1:="0101"; 0 E1 v: ^% g9 G) `0 B
END IF;
( c9 K# i _; g END IF; 5 H. c2 h; o! n$ Z' j) d% Z
END IF;
9 b9 y- ]7 Q# i! N$ ^ q END IF;6 j. C: D; ?; ] R* x
END IF;
/ I. e% U. I1 Y( D: u9 _! dQ0 <= imper0; Q1 <= imper1;
0 P! O4 y. r/ W) k# j. m7 SRing <= not(imper0(0) or imper0(1) or imper0(2) or imper0(3) or imper1(0) or imper1(1) or imper1(2) or imper1(3));
5 K( H! j7 K- V: V1 M END PROCESS ;) G# v6 c* @6 z7 x/ y6 f
END arc;
0 g/ D& D4 }8 V. D% a& @% |" L `6 f. k7 T. K6 E" T
上面是我的倒數60秒程式
3 [' ^9 T, ?( U- p8 P; c小弟不才
( f: M: K, `" c$ g9 B# Q不知道怎寫停止
3 T; N- A; e6 W4 a' }; m0 E* D( _3 e: J只要數1次60就好 |
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