♂Denzel≯:基于FPGA的ADC0809采樣 - 新浪BLOG  管理博客 ┆ 搜索 ┆ 幫助 

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鼠標(biāo)雙擊滾屏  10 09 08 07 06 05 04 03 02 01 (1最快,10最慢)    轉(zhuǎn)為繁體   基于FPGA的ADC0809采樣 
作者：♂Denzel≯ 2006-11-12 00:15:33 
      標(biāo)簽：
       

當(dāng)時(shí)參加電子設(shè)計(jì)大賽前訓(xùn)練時(shí)做的小東西，發(fā)出來(lái)分享下
由FPGA芯片EP1K30TC144-3和ADC0809及VHDL語(yǔ)言實(shí)現(xiàn)的AD轉(zhuǎn)換：
主體設(shè)計(jì)圖如下：

如上圖本AD轉(zhuǎn)換主要由分頻器和ADC0809模塊實(shí)現(xiàn)
ADC0809模塊程序如下：
  LIBRARY IEEE;
  USE IEEE.STD_LOGIC_1164.ALL;
  
ENTITY ADC0809 IS
  PORT ( D : IN STD_LOGIC_VECTOR(7 DOWNTO 0);
  CLK,EOC : IN STD_LOGIC;
  LOCK1,ALE,START,OE,A0,A1,A2 : OUT STD_LOGIC;
  QOUT : OUT STD_LOGIC_VECTOR(7 DOWNTO 0) );
  END ADC0809;

  ARCHITECTURE behav OF ADC0809 IS
  TYPE states IS (st0,st1,st2,st3,st4);
  SIGNAL current_state , next_state: states :=st0 ;
  SIGNAL REGL : STD_LOGIC_VECTOR(7 DOWNTO 0);
  SIGNAL LOCK : STD_LOGIC;
  BEGIN
  A0 <= '0';A1 <='0';A2<='0'; LOCK1 <=LOCK; QOUT<=REGL;
  COM1: PROCESS(current_state,EOC)
  BEGIN
  CASE current_state IS
  WHEN st0 => next_state <= st1;
  WHEN st1 => next_state <= st2;
  WHEN st2 => IF (EOC='1') THEN next_state <= st3;
  ELSE next_state <= st2;
  END IF;
  WHEN st3 => next_state <= st4;
  WHEN st4 => next_state <= st0;
  WHEN OTHERS => next_state <= st0;
  END CASE ;
  END PROCESS COM1 ;

  COM2: PROCESS(current_state)
  BEGIN
  CASE current_state IS
  WHEN st0 => ALE<='0';START<='0';OE<='0';LOCK<='0';
  WHEN st1 => ALE<='1';START<='1';OE<='0';LOCK<='0';
  WHEN st2 => ALE<='0';START<='0';OE<='0';LOCK<='0';
  WHEN st3 => ALE<='0';START<='0';OE<='1';LOCK<='0';
  WHEN st4 => ALE<='0';START<='0';OE<='1';LOCK<='1';
  WHEN OTHERS => ALE<='0';START<='0';LOCK<='0';
  END CASE;
  END PROCESS COM2;

  PROCESS (CLK)
  BEGIN
  IF (CLK'EVENT AND CLK='1') THEN
  current_state <= next_state;
  END IF;
  END PROCESS;
  PROCESS (LOCK)
  BEGIN
  IF LOCK='1' AND LOCK'EVENT THEN REGL <=D;
  END IF;
  END PROCESS;
  END behav
軟件分頻器模塊程序如下：
  LIBRARY IEEE;
  USE IEEE.STD_LOGIC_1164.ALL;
  USE IEEE.STD_LOGIC_ARITH.ALL;
  USE IEEE.STD_LOGIC_UNSIGNED.ALL;
  ?/P>
  ENTITY clkdiv8 IS
  PORT( clk : IN STD_LOGIC;
  clk_div8 : OUT STD_LOGIC);
  END clkdiv8;
  ARCHITECTURE one OF clkdiv8 IS
  SIGNAL count : STD_LOGIC_VECTOR(6 DOWNTO 0);
  BEGIN
  PROCESS(clk)
  BEGIN
  IF (clk'event AND clk='1' ) THEN
  IF(count= "1111111" ) THEN
  count <= (OTHERS =>'0' );
  ELSE
  count <= count +1;
  END IF ;
  END IF ;
  END PROCESS;
  clk_div8 <= count(6);
  END one;
仿真圖如下：

以上設(shè)計(jì)我已用硬件實(shí)現(xiàn)過(guò)，在秒向分進(jìn)位和分向時(shí)進(jìn)位及23時(shí)置0時(shí)有毛刺，分別會(huì)顯示“60秒”1秒鐘，“60分”1秒鐘，“24時(shí)”1秒鐘。
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