Programmable logic array integrated circuit devices with flexibl

Details Programmable logic array integrated circuit devices with flexibl Programmable logic array integrated circuit devices with flexibl

1995-09-01

1997-05-20

Westin, Edward P.

Electronic digital logic circuitry

Multifunctional or programmable

Array

326 41, H03K 19177

Patent

active

056315767

ABSTRACT:
A programmable logic array integrated circuit has a plurality of logic modules, each of which is programmable to perform any of several logic functions. One such function is the performance of one place of binary addition yielding a sum out signal and a carry out signal. In addition to a dedicated carry chain which conveys the carry out signal of each logic module to the carry in input of another predetermined logic module, circuitry is provided for allowing the carry out signal of each logic module to be alternatively routed through the more general interconnection circuitry of the device. This increases the flexibility of routing of the carry out signals, thereby increasing the flexibility of use of the integrated circuit. Improved circuitry for handling a carry in signal may also be provided in each logic module.

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