Method for providing engineering changes to LSI PLAs

Details Method for providing engineering changes to LSI PLAs Method for providing engineering changes to LSI PLAs

1987-07-06

1989-11-14

Hearn, Brian E.

Fishing, trapping, and vermin destroying

148DIG104, 148DIG143, 357 45, 437 36, 437 48, H01L 2120, H01L 2100

Patent

active

048807540

ABSTRACT:
A method for providing engineering changes to LSI PLAs. One or more additional input lines, output lines, and/or product terms are provided in the overall mask set, however, logically unconnected to the rest of the PLA, which is designed to provide the desired PLA function. The additional lines and terms are provided so as to be able to be connected to the PLA, and provide additional personalization by changes to the contact mask and masks for subsequent process steps to contact. The invention may be incorporated in an existing PLA macro assembler system. By simply redefining certain cells the additional devices may be incorporated through those redefined individual cells. Thus, the invention is relatively easy to retrofit to existing PLA macro assembler systems.

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