seg7.vhd

来自「一本很好的关于学习VHDL的书,Fundamentals of Digital 」· VHDL 代码 · 共 28 行

LIBRARY ieee ;
USE ieee.std_logic_1164.all ;

ENTITY seg7 IS
	PORT (	bcd 	: IN 	STD_LOGIC_VECTOR(3 DOWNTO 0) ;
			leds	: OUT 	STD_LOGIC_VECTOR(1 TO 7) ) ;
END seg7 ;

ARCHITECTURE Behavior OF seg7 IS	
BEGIN
	PROCESS ( bcd )
	BEGIN
		CASE bcd IS 					 --	abcdefg
			WHEN "0000" 	=> leds 	<= "1111110" ;
			WHEN "0001" 	=> leds 	<= "0110000" ;
			WHEN "0010" 	=> leds 	<= "1101101" ;
			WHEN "0011" 	=> leds 	<= "1111001" ;
			WHEN "0100" 	=> leds 	<= "0110011" ;
			WHEN "0101" 	=> leds 	<= "1011011" ;
			WHEN "0110" 	=> leds 	<= "1011111" ;
			WHEN "0111" 	=> leds 	<= "1110000" ;
			WHEN "1000" 	=> leds 	<= "1111111" ;
			WHEN "1001" 	=> leds 	<= "1110011" ;
			WHEN OTHERS 	=> leds 	<= "-------" ;
		END CASE ;
	END PROCESS ;
END Behavior ;