Boolean
Function with Feedback
17/3/2014
CE-653 - Latch Controller Designs - Case Studies
14
}Define:
}SET, KEEP and RESET functions which are
feedback free
}RESET = U – SET (OFF-set of SET), or
}RESET ∩ SET = Ø
}KEEP = RESET’
}Sole feedback of f is on the f line (feeds back to
input)
}Form 1 (Set and Keep):
}f = (SET function) + f (KEEP function)
}Form 2 (Set and Reset):
}f = (SET function) + f (RESET function)’
}Example
}Asymmetric C Element:
}f = bc (SET) + f (ab’)’ (RESET)’