Programmable logic array integrated circuits with enhanced casca

Details Programmable logic array integrated circuits with enhanced casca Programmable logic array integrated circuits with enhanced casca

1995-06-30

1999-04-27

Westin, Edward P.

Electronic digital logic circuitry

Multifunctional or programmable

Array

326 41, H03K 738, H03K 19177

Patent

active

058983180

ABSTRACT:
A programmable logic device (10) has a number of programmable logic elements (LEs) (12) which are grouped together in a plurality of logic array blocks (LABs) (14). A global interconnect structure (20, 24) is provided for interconnecting a LAB with other LABs. Adjacent or nearby LEs are connectable to one another via cascade connectors (72) between LEs. The cascade is enhanced by providing a selector (90) that allows a cascade line from one LE to selectively be coupled to an input of an adjacent or nearby LE through a cascade logic gate (94).

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