PM8379

PM8379 CTS 20x4G Advance 20-Port 4.25 Gbit/s FC-AL Cut-Through Switch The CTS 20x4G is designed to interface directly to Fibre Channel disk drives in a storage array. It can interface directly to optics or to cables at the ingress/egress www.datasheet4u.com point of an enclosure and is able to determine if an incoming frame is destined for a drive within that enclosure. After determining which port is associated with the frames recipient, a cut through operation to that port is performed thereby significantly reducing system latency and improving performance. The CTS 20x4G provides unique disk isolation features that significantly increase total system availability, reliability, and serviceability. Built-in self test capability with FC Frame Generator/Comparator. Supports a 106.25 MHz, 40-bit (20 receive + 20 transmit) DDR parallel interface that acts as a 21st port. This flexible interface enables external functions such as enclosure management or other user-proprietary functions to be implemented using a low cost FPGA. CUT-THROUGH SWITCHING Integrated cut-through switching and arbitration management enables up to 200% improvement in EDR and IOPS. Parallel arbitration supported with arbitration priority and access fairness preserved. Automatic or CPU controlled initialization of AL_PA table. Supports dynamic half duplex, half/full duplex operation, LPSM transfer state, multicast/broadcast (OPNy). FEATURES GENERAL 20 independent rate selectable 1.0625, 2.125 ...