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4#
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發表於 2008-10-7 19:33:22
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LIBRARY ieee; ; C6 N, _/ T3 q. {
USE ieee.std_logic_1164.all; USE ieee.std_logic_unsigned.all;
4 I- U; m, n e( z( z4 R3 RENTITY counter_60_seg_v IS: p* ?( C. \% y
PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;
- Z4 r; n4 y0 @1 ~ D0,D1 : IN STD_LOGIC_VECTOR(3 downto 0);
5 d, `% e0 ?) g; O Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0);
5 P6 `+ w5 u# ~8 R2 j9 s$ I# U- O% j Co : OUT STD_LOGIC);9 U6 Z k; ^ ?# Y* u5 ^( z
END counter_60_seg_v;
8 I8 S: D8 L& a0 M6 b' k) \ARCHITECTURE arc OF counter_60_seg_v IS
' C K9 A$ d& U1 R8 D5 ^& Y) I BEGIN( s' J; j+ J R* I" s& N8 y
PROCESS (Clk)
3 X/ F/ ~- O; e- O8 r VARIABLE imper0,imper1 :STD_LOGIC_VECTOR(3 downto 0);0 h" f; K) b F, U6 {
BEGIN7 f1 t0 Q2 I6 }' D
IF Clrn='0' THEN imper1 := "0000"; imper0 := "0000";
* T- k$ [( |, E+ F7 M; y- |3 W ELSE IF (Clk'event AND Clk='1') THEN! u9 \0 ]6 f, v
IF Load='0' THEN imper0 :=D0; imper1:=D1;$ V% f6 B$ D* E' g( k( k
ELSIF Ena='1' THEN
( p+ b( c( I: B. } IF imper0="1000" AND imper1="0101" THEN ( q+ N! ]. G0 p: ^# Z5 v$ Q
imper0:="1001";$ V9 r+ [/ m4 ?1 |* }+ z* N$ i9 N
ELSIF imper0<"1001" THEN imper0 := imper0+1;2 p# S9 }2 o6 n5 u* ?9 f1 \$ A
ELSE imper0:="0000";
! U ]. S) d' x. O IF imper1<"0101" THEN imper1:= imper1+1;: }4 z/ t3 v! q1 @
ELSE imper1:="0000";
0 e" I; V g! e- S, X END IF;
: o s' |6 w& z) c( W3 X" g6 E6 b END IF;
4 G6 D1 y* R& _1 Q) r: Y( u9 ~ END IF;
1 J: d, A! A8 Z! p+ @( O END IF;
# O7 }# S% k0 U; r9 s' B9 j; l END IF;; F7 ^2 J7 Q/ v3 R
Co<=imper0(0)and imper0(3)and imper1(0)and imper1(2)and Ena;
: h2 \, O" L, y- a Q0 <= imper0; Q1 <= imper1;
; r1 f* t5 B" \3 ?. V END PROCESS ;
% A8 Y+ H ~0 M3 tEND arc;% q3 N2 _) T& X s
+ t8 Q) a+ }; o0 d) a/ j7 y
這個是60模計數器設計9 n. m" L# a; C4 W( J0 p
要怎弄成倒數60?
8 l% a$ |! M% W2 ~0 R有人會用成倒數60秒先幫忙吧
9 d: M5 ?! F+ F) a/ A7 |4 _3 q: d請問一下我會用到幾對幾的多工器啊 |
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