BEGIN PROCESS (opcode, a, b) BEGIN CASE opcode is WhEN plus=> result<=a+b;-a、b相加 WHEN minus=> result<=a-b;--a、b相减 WhEN equal=> a、b相等 IF(a=b) THEn result <=x01"i ELSE result <=x00" END IF: WhEN not equal = 、b不相等 IF(a/ = b)then result <=x 0l ELSE result <=x00 END IF END CASE END PROCESS end behaveBEGIN PROCESS (opcode,a,b) BEGIN CASE opcode IS WHEN plus => result <= a + b; -- a、b相加 WHEN minus => result <= a - b; -- a、b相减 WHEN equal => -- a、b相等 IF (a = b) THEN result <= x"01"; ELSE result <= x"00"; END IF; WHEN not_equal => -- a、b不相等 IF (a /= b) THEN result <= x"01"; ELSE result <= x"00"; END IF; END CASE; END PROCESS; END behave;