?? alpher.vhd
字號:
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
ENTITY alpher IS
PORT(
clk : IN STD_LOGIC;
choice : OUT STD_LOGIC_VECTOR(7 downto 0);
data : OUT STD_LOGIC_VECTOR(7 downto 0));
END alpher;
ARCHITECTURE a OF alpher IS
SIGNAL count : STD_LOGIC_VECTOR(3 downto 0);
SIGNAL temp : STD_LOGIC_VECTOR(3 downto 0);
BEGIN
choice<="10000000";
clk1_label:
PROCESS (clk)
BEGIN
IF clk'event and clk='1' THEN
count<=count+1;
END IF;
END PROCESS clk1_label;
WITH count select
data <= "11111100" WHEN "0000",
"01100000" WHEN "0001",
"11011010" WHEN "0010",
"11110010" WHEN "0011",
"01100110" WHEN "0100",
"10110110" WHEN "0101",
"10111110" WHEN "0110",
"11100000" WHEN "0111",
"11111110" WHEN "1000",
"11110110" WHEN "1001",
"11101110" WHEN "1010",
"00111110" WHEN "1011",
"10011100" WHEN "1100",
"01111010" WHEN "1101",
"10011110" WHEN "1110",
"10001110" WHEN OTHERS;
END a;
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