sub8.vst

i need of vhdl code for 32-bit risc processor

ENTITY sub8 IS
PORT (
sn1 : IN bit_vector(7 downto 0);
sn2 : IN bit_vector(7 downto 0);
sout : OUT bit_vector(7 downto 0)
);
END sub8;

ARCHITECTURE sub8_arch OF sub8 IS

COMPONENT cla
PORT (
a : IN bit_vector(7 downto 0);
b : IN bit_vector(7 downto 0);
c0 : IN BIT;
s : OUT bit_vector(7 downto 0);
cout : OUT BIT
);
END COMPONENT ;

COMPONENT notgate 
PORT (
a4 : IN BIT;
c4 : OUT BIT
);
END COMPONENT;

COMPONENT buffer1 
PORT (
bu1 : IN BIT;
bu2 : OUT BIT
);
END COMPONENT;

COMPONENT xor2gate 
PORT (
a5 : IN BIT;
b5 : IN BIT;
d5 : OUT BIT
);
END COMPONENT;


SIGNAL bint : bit_vector(7 downto 0);
SIGNAL car1 : BIT ;
SIGNAL carry2 : BIT;

BEGIN

not0 : notgate PORT MAP(sn2(0),bint(0));
not01 : notgate PORT MAP(sn2(1),bint(1));
not02 : notgate PORT MAP(sn2(2),bint(2));
not03 : notgate PORT MAP(sn2(3),bint(3));
not04 : notgate PORT MAP(sn2(4),bint(4));
not05 : notgate PORT MAP(sn2(5),bint(5));
not06 : notgate PORT MAP(sn2(6),bint(6));
not07 : notgate PORT MAP(sn2(7),bint(7));

BUF1 : buffer1 PORT MAP(sn1(0),car1);

cl0 : cla PORT MAP(sn1,bint,car1,sout,carry2);


END;