Altera

The logic fabric and routing architecture in Altera FPGAs provide customers with a number of advantages. Altera introduced the 8-input fracturable look-up table (LUT) with the Stratix II family in 2004. At its core is the adaptive logic module (ALM) with 8 inputs, which can implement a full 6-input LUT (6-LUT) or select 7-input functions. The ALM can also be efficiently partitioned into independent smaller LUTs, providing the performance advantage of larger LUTs and the area efficiency of smaller LUTs.