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發表於 2008-10-7 19:33:22
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LIBRARY ieee;
' K3 w" C& A' N& `" v4 h, H9 ? X8 }/ RUSE ieee.std_logic_1164.all; USE ieee.std_logic_unsigned.all;
& Q9 J/ H8 @# a. PENTITY counter_60_seg_v IS H9 \4 K+ B5 ^7 p& e' l
PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;2 V6 l! D6 g7 V( P
D0,D1 : IN STD_LOGIC_VECTOR(3 downto 0);4 P* V- e8 c6 v" `1 T
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0);
- H- G5 L& U+ U( a# F+ M6 ` t5 N+ F Co : OUT STD_LOGIC);
0 u, ?5 v! I" K; O+ }0 T( nEND counter_60_seg_v;$ l5 f. Y/ H! X1 g0 t, y; K
ARCHITECTURE arc OF counter_60_seg_v IS% c; R( g" e1 u4 A$ Q9 I; U( E/ c
BEGIN
8 H8 m8 p- s5 ^/ b& ^ PROCESS (Clk)8 \$ i' C& o0 t$ I. }$ c
VARIABLE imper0,imper1 :STD_LOGIC_VECTOR(3 downto 0);
: q: ^6 N, J6 x% e# |1 R BEGIN5 N% Y6 Z! C1 i1 c& t* N
IF Clrn='0' THEN imper1 := "0000"; imper0 := "0000";
8 R* Q7 b$ P/ B ELSE IF (Clk'event AND Clk='1') THEN
2 D2 h, J9 ?4 j8 L IF Load='0' THEN imper0 :=D0; imper1:=D1;
' T: W+ J7 z. ]' j9 ]5 e ELSIF Ena='1' THEN+ \* p+ h2 Z, u5 h
IF imper0="1000" AND imper1="0101" THEN : v/ h- H, L' \
imper0:="1001";& j, @. q& I1 a7 X7 a) r! I
ELSIF imper0<"1001" THEN imper0 := imper0+1;
9 g9 V. G0 F6 ~/ ]+ ~ ELSE imper0:="0000";
5 u* ?9 R, X: l9 ~ u IF imper1<"0101" THEN imper1:= imper1+1;4 f7 A5 x, z% o
ELSE imper1:="0000"; " @7 ~+ ^. E( q! G9 a/ M
END IF;+ F( c# G3 `8 T. W' E7 y- U6 u" K) L
END IF;
# q' u8 g- k' V; K& _/ W6 e5 d END IF;$ T. N& f9 |6 s, H# g5 Z' U7 S. ~
END IF;# n& Z8 A/ b! C( e
END IF;
& Y2 G% \. @2 G/ L, E5 G; ^ Co<=imper0(0)and imper0(3)and imper1(0)and imper1(2)and Ena; ) W. `3 r" F$ i/ u" x" g
Q0 <= imper0; Q1 <= imper1;
" d- q* S1 i0 j8 U2 C: I END PROCESS ;
# }, s/ t: E6 |7 BEND arc;
# W' |9 P {0 d. o1 g" O* \. o) B2 x; z: @1 j) v
這個是60模計數器設計 J/ l9 e9 a/ E1 x- c
要怎弄成倒數60?0 ?' F3 S( e1 m" b
有人會用成倒數60秒先幫忙吧4 F& u: a3 H# E4 P
請問一下我會用到幾對幾的多工器啊 |
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