Look Up Table

A Look Up Table or an LUT is an array that is used frequently in computer programming and FPGAs in order to store values which can be referred to so as to reduce the amount of runtime calculations that takes place at a time. As such, Look Up Tables can save processing time as the values that have already been computed can simply be retrieved from an index rather than having to be processed and computed once again. This process also makes it faster. FPGAs frequently and very commonly employ the use of Look Up Tables as a mean of logic implementation.