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發表於 2008-10-7 19:33:22
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LIBRARY ieee; ! j+ j1 q3 `: w1 B; r( N& ?8 l
USE ieee.std_logic_1164.all; USE ieee.std_logic_unsigned.all;
. }! v& P6 S8 C0 ~- R% L2 N1 q: s+ g8 bENTITY counter_60_seg_v IS
# j# @3 F4 @3 B: w" F: {, o! Q0 { PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
$ {2 r2 \: Y, E, s7 k D0,D1 : IN STD_LOGIC_VECTOR(3 downto 0);5 ]" I# T1 F# }) i5 R
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0);$ s- t7 w1 }; U' H; ]
Co : OUT STD_LOGIC);
( f" n5 B6 u, s# ^ @END counter_60_seg_v;& x/ U, ~6 P1 j( f( j7 v* n9 K
ARCHITECTURE arc OF counter_60_seg_v IS8 p& |' ~( A, \
BEGIN% S! \0 U- X6 g& P
PROCESS (Clk)
7 J5 O3 N3 y- d$ H* O) K VARIABLE imper0,imper1 :STD_LOGIC_VECTOR(3 downto 0);
2 V/ t$ g1 n8 O. @# G BEGIN2 W9 ?# A8 G+ O
IF Clrn='0' THEN imper1 := "0000"; imper0 := "0000";, c0 I8 U& Q3 j
ELSE IF (Clk'event AND Clk='1') THEN+ O0 U2 F! L2 b! v. Y
IF Load='0' THEN imper0 :=D0; imper1:=D1;
! G' J3 s" L5 O' z: C ELSIF Ena='1' THEN
) H$ X8 z: h0 T6 m+ l( B IF imper0="1000" AND imper1="0101" THEN
! a( G# L8 e5 o8 ?+ b4 o1 G* s imper0:="1001";
& @3 c- {- W0 h3 f' ` ELSIF imper0<"1001" THEN imper0 := imper0+1;/ u; c: @8 z9 ?9 R. G( p; q3 Z' y
ELSE imper0:="0000";
. R: R, L, R) E+ [! x( E IF imper1<"0101" THEN imper1:= imper1+1;9 i; l1 E$ Z4 f
ELSE imper1:="0000";
1 q ]) b8 r* E! ?- I0 [$ \+ m* k END IF;) {0 i2 C( |! P3 q* m. v ]8 I
END IF; # n y. d2 C( j, e4 o, K
END IF;8 i: }7 a- _/ f' w& P8 ?4 r+ Q* X3 `
END IF;6 l# p% Q% a3 X, \* w! {+ y
END IF;& B; s" ?9 E; S4 @! [: L! A/ P" r
Co<=imper0(0)and imper0(3)and imper1(0)and imper1(2)and Ena; ; ~$ B& b5 v2 z U: d' n
Q0 <= imper0; Q1 <= imper1; 7 K7 I8 t# E \ b) B1 [- `
END PROCESS ;& B) T& a8 P8 n2 r! I& I5 F
END arc;
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這個是60模計數器設計
0 M% C+ \0 K3 x! v3 m3 i- O+ U0 A要怎弄成倒數60?
# E# d Q% ]2 l1 Q. o) \2 \# M有人會用成倒數60秒先幫忙吧6 k' z* a3 |- Y
請問一下我會用到幾對幾的多工器啊 |
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