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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;