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發表於 2008-10-7 19:33:22
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LIBRARY ieee; ( H" e; s+ p; c% x; l
USE ieee.std_logic_1164.all; USE ieee.std_logic_unsigned.all;
0 @/ u0 I; o% ^7 d. |1 i# T0 v+ eENTITY counter_60_seg_v IS
+ k; E- {- g- O. c3 X PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
8 W" q4 K' `% n3 A/ x D0,D1 : IN STD_LOGIC_VECTOR(3 downto 0);; K. X4 p O% N3 k1 O
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0);
; J, }2 f1 q; F4 z Co : OUT STD_LOGIC); J7 z9 U- g- z' o6 B
END counter_60_seg_v;! o% x( j0 y# p! R% f+ q/ Z
ARCHITECTURE arc OF counter_60_seg_v IS; o" V# J' Y% M1 N# g
BEGIN
# h# L( f) U0 a* |6 a$ c& ~2 m PROCESS (Clk)/ e% R* B+ w/ f8 }# u7 q
VARIABLE imper0,imper1 :STD_LOGIC_VECTOR(3 downto 0);5 Y1 v F9 L5 Z( G
BEGIN
. ~3 |$ x% _: W7 j# ? IF Clrn='0' THEN imper1 := "0000"; imper0 := "0000";& u) c9 G% X! Q* u
ELSE IF (Clk'event AND Clk='1') THEN0 ` g# j. E5 j* F9 r$ ]! I, [) d
IF Load='0' THEN imper0 :=D0; imper1:=D1;
& ^$ y2 Z4 r) C2 J( b1 g0 y' ?' x ELSIF Ena='1' THEN ^' i8 J7 Z& K( k( W" t2 w' y
IF imper0="1000" AND imper1="0101" THEN : U' A- p# j* }) ?- W: Z: p# u; F
imper0:="1001";' \) b4 ~/ R$ ^; s$ r
ELSIF imper0<"1001" THEN imper0 := imper0+1;2 \5 a: r7 K$ e* |, X5 L2 T
ELSE imper0:="0000";
( A. Z/ W R+ u! m1 d' Z IF imper1<"0101" THEN imper1:= imper1+1;
4 g$ z7 S- L2 f3 T/ }5 C ELSE imper1:="0000";
- P2 W! t! `( A6 k% h3 m END IF;
/ L; z4 Q0 O' Q8 T1 E# ~* \ END IF;
. `# G4 r) A9 ]0 a5 V8 T END IF;" ^4 A# k' E K: |
END IF;, c( ~* T% q, t8 I8 q/ f4 G1 V
END IF;
! f- m+ h7 R8 j" @* U Co<=imper0(0)and imper0(3)and imper1(0)and imper1(2)and Ena;
; a5 t& Z, L& T6 M1 T0 j- k3 d4 O( C Q0 <= imper0; Q1 <= imper1; 3 T1 t; d! ~0 r& l1 C8 ]9 o
END PROCESS ;
* Q; y6 _. D- A/ x0 OEND arc;
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8 u4 g4 E" V& t這個是60模計數器設計: P$ D! y3 y5 O6 f
要怎弄成倒數60?
6 k% k6 N9 z4 y+ F有人會用成倒數60秒先幫忙吧
6 }2 \( \: @# R# j請問一下我會用到幾對幾的多工器啊 |
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