Lookup table and programmable logic device including lookup table

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United States of America Patent

PATENT NO 9117501
APP PUB NO 20150179236A1
SERIAL NO

14640192

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Abstract

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To optimize the arrangement of configuration data stored in a configuration memory. A lookup table includes a memory configured to store configuration data, a plurality of multiplexers each configured to select one signal from a plurality of input signals in accordance with the configuration data supplied from the memory and output the one signal, and an inverter. The plurality of multiplexers are connected in a binary tree with multiple levels. The inverter is provided between one of input terminals of a multiplexer in an uppermost level and an output terminal of a multiplexer in one level lower than the uppermost level. Signal selection is performed in each of the multiplexers so that the multiplexer in the uppermost level outputs, as an output signal, one signal of all input signals of the multiplexers in a lowermost level.

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Patent Owner(s)

  • SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Takemura, Yasuhiko Kanagawa, JP 581 31445

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