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library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; entity counter8 is port (clk : in std_logic; led0 : out std_logic); end counter8; architecture synth of counter8 is begin process (clk) variable temp : unsigned (7 downto 0); begin if rising_edge(clk) then temp:= temp + 1; led0 <= temp(0); end if; end process; end synth;