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--   File Name    : comp1.vbe                                           --

--   Description  : The special comparator resulting                    --

--                  a 17-bit integer 2^16 or the lower 17-bit integers  --

--   Purpose      : To be used by ASIMUT and SCMAP                      --

--   Date         : Aug 22, 2001                                        --

--   Version      : 1.1                                                 --

--   Author       : Martadinata A.                                      --

--   Address      : VLSI RG, Dept. of Electrical Engineering            --

--                  ITB, Bandung, Indonesia                             --

--   E-mail       : marta@vlsi.itb.ac.id                                --

entity com1 is

port(

  kin     : in    bit_vector(15 downto 0);

  kout1   : out   bit_vector(16 downto 0);

  vdd     : in    bit;

  vss     : in    bit

  );

end com1;

architecture vbe of com1 is

signal sign : bit;

begin

  assert ((vdd and not (vss)) = '1')

    report "power supply is missing on com1"

    severity warning;

    sign <= '1' when (kin = "0000000000000000")

            else '0';

  kout1 <= sign & kin(15 downto 0);

end;