fpj.vhd

来自「这是本人在Max plus2环境下用VHDL语言编的交通灯控制程序。做EDA课程」· VHDL 代码 · 共 32 行

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY FPJ IS 
PORT(CLK,RST: IN STD_LOGIC;
      cout:OUT STD_LOGIC);
END ENTITY FPJ;

ARCHITECTURE one OF FPJ IS
SIGNAL CNTER:INTEGER RANGE 0 TO 1;

BEGIN 

U1:PROCESS(CLK,RST)
BEGIN 
IF RST='1' THEN CNTER<=0;
 ELSIF CLK'EVENT AND CLK='1' THEN 
     IF CNTER=1 THEN CNTER<=0;
       ELSE CNTER<=CNTER+1;
     END IF;
 END IF;
END PROCESS U1;

U2:PROCESS(CNTER)
BEGIN 
  IF CNTER=1 THEN cout<='1';
  ELSE cout<='0';
  END IF;
END PROCESS U2;
END ARCHITECTURE one;