count_16.tdf

来自「设计并调试好一个16*16 LED点阵组成的彩灯图案」· TDF 代码 · 共 26 行

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY COUNT_16 IS
  PORT(DISCLK:IN STD_LOGIC;
       Q:OUT STD_LOGIC_VECTOR(3 DOWNTO 0));
END COUNT_16;
ARCHITECTURE B OF COUNT_16 IS
    SIGNAL AL:STD_LOGIC_VECTOR(3 DOWNTO 0);
BEGIN
PROCESS(DISCLK)
  BEGIN
  IF DISCLK'EVENT AND DISCLK='1'THEN
      IF AL="1111"THEN
         AL<="0000";
      ELSE 
         AL<=AL+"0001";
      END IF;
  END IF;
END PROCESS;
Q<=AL;
END B;