A programmable logic integrated circuit device has at least one function-specific circuit block (e.g., a parallel multiplier, a parallel barrel shifter, a parallel arithmetic logic unit, etc.) in addition to the usual multiple regions of programmable logic and the usual programmable interconnection circuit...http://www.google.com/patents/US6628140?utm_source=gb-gplus-sharePatent US6628140 - Programmable logic devices with function-specific blocks
