A switch having a plurality of input/output (I/O) ports and a crossbar device programmably coupling a first of the I/O ports with a second of the I/O ports. A plurality of port request controllers (PRCs) are coupled such that each PRC is associated with one of the I/O ports. A plurality of serial request...http://www.google.de/patents/US6138185?utm_source=gb-gplus-sharePatent US6138185 - High performance crossbar switch
