Programmable logic device macrocell with improved logic capabili

Details Programmable logic device macrocell with improved logic capabili Programmable logic device macrocell with improved logic capabili

1998-11-30

2000-12-05

Tokar, Michael

Electronic digital logic circuitry

Multifunctional or programmable

Array

326 41, H03K 19177

Patent

active

06157208&

ABSTRACT:
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 the unborrowed product terms. The macrocell may include circuitry for feeding back to the AND array of the programmable logic device a combinatorial or registered signal of the macrocell, and also outputting such a combinatorial or registered signal from the macrocell. When a combinatorial signal is fed back, the register of the macrocell can be used for another signal of the macrocell.

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