A macrocell for a programmable logic device includes circuitry for allowing a neighboring macrocell to borrow various numbers of the product terms of the macrocell. The macrocell can continue to make full use of its product terms that are not thus borrowed. This includes logically combining and registering...http://www.google.com/patents/US5861760?utm_source=gb-gplus-sharePatent US5861760 - Programmable logic device macrocell with improved capability
