library ieee;
use ieee.std_logic_1164.all;
use work.cypress.all;

-- 7451 Function needed for SSN lab

entity s7451 is
  port (  a1,b1,c1,d1: in std_logic;
	  a2,b2,c2,d2: in std_logic;
	  y1,y2:    out std_logic
       );


attribute pin_numbers of s7451:entity is

" a1:2 b1:3  c1:4  d1:5 a2:6 b2:7  c2:8  d2:9 " &
  " y1:22  y2:21 ";  


end s7451;

architecture a of s7451 is

begin

 y1 <= not ( (a1 and b1) or (c1 and d1));
 y2 <= not ( (a2 and b2) or (c2 and d2));


end a;