Question

12 Find and correct four errors in this program: ENTITY magnitude IS PORT (a,b: IN BIT_VECTOR (3 DOWNTO 0); aEQb, aGTb, aLTb:OUT BIT); END magnitude; ARCHITECTURE a OF magnitude IS BEGIN PROCESS BEGIN IF a b THEN aEQb< 1; aLTb <= 0; ELSIF a > b THEN ELSIF a <b THEN END a;

Answer 1

Solution :-

The errors in the program are corrected in the below program. The underlined sections in the below given program are the corrected errors. In the first IF loop the assignment of the output bits are not in inverted comma. Then the process is not terminated with a matching end process clauseas well as if loop. All the errors are syntax errors in the program and corrected in the given program.

The code starts here -

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ENTITY magnitude IS

PORT ( a, b : IN BIT_VECTOR (3 DOWNTO 0);

aEQb, aGTb, aLTb : OUT BIT);

end magnitude;

ARCHITECTURE a OF magnitude IS

BEGIN

PROCESS

BEGIN

IF a = b THEN

aEQb <= '1';

  aGTb <= '0';

  aLTb <= '0';   

ELSEIF a > b THEN

aEQb <= '0';

  aGTb <= '1';

aLTb <= '0';

ELSEIF a < b THEN

aEQb <= '0';

  aGTb <= '0';

aLTb <= '1';

  ENDIF;

END PROCESS;

END a;

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