神马品牌网内六角螺丝怎么量尺寸:二位二进制计数器的VHDL程序
来源：百度文库 编辑：神马品牌网 时间：2024/04/29 20:49:22
顶层设计中要求用进程编写
我有个四位的，希望对你有帮助
四位二进制同步计数器的VHDL程序
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
useieee.std_logic_arith.all;
ENTITY counter IS
PORT(
DATAIN:IN integer range 0 to 15;
CLK :IN std_logic;
CLR :IN std_logic;
LOAD:IN std_logic;
DATAOUT :OUT integer range 0 to 15;
CP:OUT std_logic);
END counter;
ARCHITECTURE behav OF counter IS
SIGNAL num:integer range 0 to 15;
SIGNAL CP0:std_logic;
BEGIN
PROCESS(CLK,CLR)
BEGIN
IF ( CLR = '1' ) THEN
num <= 0;
ELSE
IF ( CLK'event AND CLK = '1') THEN
IF ( LOAD = '1') THEN
num <= DATAIN;
ELSE
num <= num + 1;
END IF;
IF( num = 15 )THEN
CP0 <= '1';
ELSE
CP0 <= '0';
END IF;
END IF;
END IF;
END PROCESS;
DATAOUT <= num;
CP <= CP0;
END;
--maxplus2下调试通过