ftimer.vhd

设计一个五路呼叫器,具体设计要求如下: 1．五个按键模拟五个呼叫源 2．当有一个按键按下时

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;

ENTITY FTIMER IS
	PORT( iKEY:   IN STD_LOGIC_VECTOR(4 DOWNTO 0);
		  iIS:   IN STD_LOGIC_VECTOR(4 DOWNTO 0);
		  oLED: OUT STD_LOGIC_VECTOR(6 DOWNTO 0));
END FTIMER;

ARCHITECTURE run OF FTIMER IS
	SIGNAL S_oLED: STD_LOGIC_VECTOR(6 DOWNTO 0);
BEGIN
PROCESS(iIS,iKEY)
BEGIN
	CASE iIS IS
	WHEN "00001" => IF iKEY(0)='0' THEN S_oLED<="1111001"; ELSE S_oLED<="1111111"; END IF;
	WHEN "00010" => IF iKEY(1)='0' THEN S_oLED<="0100100"; ELSE S_oLED<="1111111"; END IF;
	WHEN "00100" => IF iKEY(2)='0' THEN S_oLED<="0110000"; ELSE S_oLED<="1111111"; END IF;
	WHEN "01000" => IF iKEY(3)='0' THEN S_oLED<="0011001"; ELSE S_oLED<="1111111"; END IF;
	WHEN "10000" => IF iKEY(4)='0' THEN S_oLED<="0010010"; ELSE S_oLED<="1111111"; END IF;
	WHEN OTHERS => oLED<="1000000";
	END CASE;
	oLED <= S_oLED;
	END PROCESS;
END ARCHITECTURE;