3-bit Parity Function:Possible VHDL Implementation

3-bit Parity Function:Possible VHDL Implementation

ENTITY parityFunction IS

PORT( A, B, C : IN t_wlogic; parity : OUT t_wlogic )

END parityFunction;

ARCHITECTURE full OF parityFunction IS

BEGIN

PROCESS (A, B, C)
VARIABLE count : integer;BEGIN
count := 0;IF A = '1' THEN count := count +1; END IF;IF B = '1' THEN count := count +1; END IF;IF C = '1' THEN count := count +1; END IF;IF (count MOD 2) = 0 THEN
OUT <= '0';
ELSE
OUT <= '1';
END IF;
END PROCESS;

END full;

(Adapted from D. R. Coelho, "The VHDL Handbook," Kluwer, 1989)

VLSI ‘91, Edinburgh

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