decl7sen.vhd

7段LED显示VHDL描述

library ieee;
use ieee.std_logic_1164.all;
entity decl7sEN is
port(A:IN STD_LOGIC_VECTOR(3 DOWNTO 0);
EN: IN STD_LOGIC;
 LED7S:OUT STD_LOGIC_VECTOR(6 DOWNTO 0));
END ;
ARCHITECTURE ONE OF DECL7SEN IS
BEGIN
PROCESS(A)
BEGIN
if EN='1'then
CASE A IS
WHEN"0000"=> LED7S  <="0111111";
WHEN"0001"=> LED7S  <="0000110";
WHEN"0010"=> LED7S  <="1011011";
WHEN"0011"=> LED7S  <="1001111";
WHEN"0100"=> LED7S  <="1100110";
WHEN"0101"=> LED7S  <="1101101";
WHEN"0110"=> LED7S  <="1111101";
WHEN"0111"=> LED7S  <="0000111";
WHEN"1000"=> LED7S  <="1111111";
WHEN"1001"=> LED7S  <="1101111";
WHEN"1010"=> LED7S  <="1110111";
WHEN"1011"=> LED7S  <="1111100";
WHEN"1100"=> LED7S  <="0111001";
WHEN"1101"=> LED7S  <="1011110";
WHEN"1110"=> LED7S  <="1111001";
WHEN"1111"=> LED7S  <="1110001";
WHEN OTHERS => NULL;
END CASE;
else LED7S<="1111111";
end if;
END PROCESS;
END;