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-- implementation of the AMI encoder. 

entity ami_enc is

        port (

        clr_bar,

        clk         : in    bit; -- clock input.

        e           : in    bit; -- input.

        s0, s1      : out   bit  -- output.

        );

end ami_enc;

architecture behaviour of ami_enc is

        signal q    : bit;      -- 1 flipflops for 2 states. 

begin

     process (clk, clr_bar) begin

        if clr_bar = '0' then

                q  <= '0';

                s1 <= '0';

                s0 <= '0';

        elsif clk'event and clk = '1' then

                q  <= q xor e;

                s1 <= q and e;

                s0 <= e and (not q);

        end if;

     end process;

end behaviour;