Look-up table

A small memory in an FPGA logic block that implements any logic function of its inputs by storing the output for every input combination. Its size, set by the number of inputs, is one of the main choices in an FPGA fabric architecture.

Also known as

LUT, Lookup table

Type

Component

Domain

Design & Architecture, Programmable logic

Part of the Design & Architecture glossary, with every term in the topic and the lifecycles, tools and standards that use them.

Last reviewed: not yet reviewed in depth. Entry last updated 23 October 2026. The full glossary