Programmable logic device with programmable word line connection

Details Programmable logic device with programmable word line connection Programmable logic device with programmable word line connection

1988-05-05

1990-02-20

Clark, David L.

Boots, shoes, and leggings

307465, G06F 738

Patent

active

049032232

ABSTRACT:
A programmable logic device having a relatively small number of programmable product terms ("P-terms") feeding each fixed combinatorial logic device, and additional "expander" programmable P-terms which do not directly feed a fixed device. Relatively simple logic functions can be performed by suitably programming the P-terms feeding the fixed devices. More complex logic functions can be performed by suitably programming the required number of expander P-terms, and then combining the outputs of those P-terms by means of another P-term. In order to conserve word lines in the programmable array, multiplexers allow selection of whether expander outputs or external inputs will be applied to certain word lines.

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