?? wx.whd
字號:
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY WX IS
PORT(CLK: IN STD_LOGIC;
Y:OUT STD_LOGIC;
Q:BUFFER STD_LOGIC_VECTOR(1 DOWNTO 0));
END WX;
ARCHITECTURE WXJGT OF WX IS
BEGIN
PROCESS(CLK)
BEGIN
IF RISING_EDGE(CLK) THEN
IF Q="11" THEN Q<="00";
ELSE Q<=Q+1;
IF Q="10" THEN Y<='1'; ELSE Y<='0';
END IF; END IF; END IF;
END PROCESS; END WXJGT;
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