A field programmable gate array (FPGA) having hierarchical interconnect structure is disclosed. The FPGA includes logic heads that have signals routed therebetween by the interconnect structure. Each logic head includes a plurality of cascadable logic blocks that can perform combinatorial logic. The...http://www.google.com.hk/patents/US6924664?utm_source=gb-gplus-share專利 US6924664 - Field programmable gate array
