Subversion Repositories idea

--   File Name    : comp2.vbe                                            --     
--   Description  : The special comparator resulting                     --
--                  an integer 2^16+1 or an integer 0 on the 16-bit data -- 
--   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 com2 is
port(
  p       : in    bit_vector(15 downto 0);      
  q       : in    bit_vector(15 downto 0);
  kout2   : out   bit_vector(15 downto 0);
  vdd     : in    bit;  
  vss     : in    bit   
  );
end com2;

architecture vbe of com2 is
signal less, equal  : bit;
begin
  assert ((vdd and not (vss)) = '1')
    report "power supply is missing on com2"
    severity warning;
  
less <= (
((not p(0)) and q(0)) and (not(p(1) xor q(1))) and  (not(p(2) xor q(2))) and 
(not(p(3) xor q(3))) and  (not(p(4) xor q(4))) and  (not(p(5) xor q(5))) and 
(not(p(6) xor q(6))) and  (not(p(7) xor q(7))) and  (not(p(8) xor q(8))) and 
(not(p(9) xor q(9))) and  (not(p(10) xor q(10))) and (not(p(11) xor q(11)))
and  (not(p(12) xor q(12))) and  (not(p(13) xor q(13))) and  (not(p(14) xor
q(14))) and  (not(p(15) xor q(15)))    
)or(
((not p(1)) and q(1)) and  (not(p(2) xor q(2))) and 
(not(p(3) xor q(3))) and  (not(p(4) xor q(4))) and  (not(p(5) xor q(5))) and 
(not(p(6) xor q(6))) and  (not(p(7) xor q(7))) and  (not(p(8) xor q(8))) and 
(not(p(9) xor q(9))) and  (not(p(10) xor q(10))) and (not(p(11) xor q(11)))
and  (not(p(12) xor q(12))) and  (not(p(13) xor q(13))) and  (not(p(14) xor
q(14))) and  (not(p(15) xor q(15))) 
)or(
((not p(2)) and q(2)) and (not(p(3) xor q(3))) and  (not(p(4) xor q(4))) and 
(not(p(5) xor q(5))) and  (not(p(6) xor q(6))) and  (not(p(7) xor q(7))) and 
(not(p(8) xor q(8))) and  (not(p(9) xor q(9))) and  (not(p(10) xor q(10))) and
(not(p(11) xor q(11))) and  (not(p(12) xor q(12))) and  (not(p(13) xor q(13)))
and  (not(p(14) xor q(14))) and  (not(p(15) xor q(15)))
)or(
((not p(3)) and q(3)) and  (not(p(4) xor q(4))) and 
(not(p(5) xor q(5))) and  (not(p(6) xor q(6))) and  (not(p(7) xor q(7))) and 
(not(p(8) xor q(8))) and  (not(p(9) xor q(9))) and  (not(p(10) xor q(10))) and
(not(p(11) xor q(11))) and  (not(p(12) xor q(12))) and  (not(p(13) xor q(13)))
and  (not(p(14) xor q(14))) and  (not(p(15) xor q(15)))
)or(
((not p(4)) and q(4)) and (not(p(5) xor q(5))) and  (not(p(6) xor q(6))) and  
(not(p(7) xor q(7))) and (not(p(8) xor q(8))) and  (not(p(9) xor q(9))) and  
(not(p(10) xor q(10))) and (not(p(11) xor q(11))) and  (not(p(12) xor q(12)))
and  (not(p(13) xor q(13))) and  (not(p(14) xor q(14))) and  (not(p(15) xor
q(15))) 
)or(
((not p(5)) and q(5)) and  (not(p(6) xor q(6))) and  
(not(p(7) xor q(7))) and (not(p(8) xor q(8))) and  (not(p(9) xor q(9))) and  
(not(p(10) xor q(10))) and (not(p(11) xor q(11))) and  (not(p(12) xor q(12)))
and  (not(p(13) xor q(13))) and  (not(p(14) xor q(14))) and  (not(p(15) xor
q(15))) 
)or(
((not p(6)) and q(6)) and  (not(p(7) xor q(7))) and (not(p(8) xor q(8))) and  
(not(p(9) xor q(9))) and  (not(p(10) xor q(10))) and (not(p(11) xor q(11))) and  
(not(p(12) xor q(12))) and  (not(p(13) xor q(13))) and  (not(p(14) xor
q(14))) and  (not(p(15) xor q(15)))
)or(
((not p(7)) and q(7)) and (not(p(8) xor q(8))) and  
(not(p(9) xor q(9))) and  (not(p(10) xor q(10))) and (not(p(11) xor q(11))) and  
(not(p(12) xor q(12))) and  (not(p(13) xor q(13))) and  (not(p(14) xor
q(14))) and  (not(p(15) xor q(15)))
)or(
((not p(8)) and q(8)) and  (not(p(9) xor q(9))) and  (not(p(10) xor q(10))) and 
(not(p(11) xor q(11))) and  (not(p(12) xor q(12))) and  (not(p(13) xor q(13))) and  
(not(p(14) xor q(14))) and  (not(p(15) xor q(15)))
)or(
((not p(9)) and q(9)) and  (not(p(10) xor q(10))) and 
(not(p(11) xor q(11))) and  (not(p(12) xor q(12))) and  (not(p(13) xor q(13))) and  
(not(p(14) xor q(14))) and  (not(p(15) xor q(15)))
)or(
((not p(10)) and q(10)) and (not(p(11) xor q(11))) and  (not(p(12) xor q(12))) and  
(not(p(13) xor q(13))) and  (not(p(14) xor q(14))) and  (not(p(15) xor q(15)))
)or(
((not p(11)) and q(11)) and  (not(p(12) xor q(12))) and  
(not(p(13) xor q(13))) and  (not(p(14) xor q(14))) and  (not(p(15) xor q(15)))
)or(
((not p(12)) and q(12)) and (not(p(13) xor q(13))) and  (not(p(14) xor q(14))) and  
(not(p(15) xor q(15)))
)or(
((not p(13)) and q(13)) and  (not(p(14) xor q(14))) and  (not(p(15) xor q(15)))
)or(
((not p(14)) and q(14)) and  (not(p(15) xor q(15)))
)or
((not p(15)) and q(15));

equal <= 
(not(p(0) xor q(0))) and (not(p(1) xor q(1))) and  (not(p(2) xor q(2))) and 
(not(p(3) xor q(3))) and  (not(p(4) xor q(4))) and  (not(p(5) xor q(5))) and 
(not(p(6) xor q(6))) and  (not(p(7) xor q(7))) and  (not(p(8) xor q(8))) and 
(not(p(9) xor q(9))) and  (not(p(10) xor q(10))) and (not(p(11) xor q(11)))
and  (not(p(12) xor q(12))) and  (not(p(13) xor q(13))) and  (not(p(14) xor
q(14))) and  (not(p(15) xor q(15)));


kout2 <= "0000000000000001" when ((less = '1') or (equal ='1')) 
          else "0000000000000000";
end;