VSC7177

Revision 4.2 July 29, 2005 Confidential www.DataSheet4U.com VSC7177 Data Sheet Enhanced 2:1 Port Selector for Serial ATA and Serial Attached SCSI FEATURES ● APPLICATIONS ● ● 2:1 port selector for both Serial ATA (SATA) and Serial Attached SCSI (SAS) links Serial ATA 1.0 compliant at 1.5 Gbps (3.0 Gbps capable) Sideband port selection Complies with Serial ATA II: Port Selector specification 1.0, including failover control Passes Serial ATA patterns transparently Programmable receiver sensitivity High output swing mode with pre-emphasis Compatible with legacy designs (VSC7173 and VSC7175); provides enhanced connectivity and signal pre-emphasis 0.6 W to 0.8 W power dissipation (depending on operating mode) 3.3 V power supply 32-pin, 7 mm x 7 mm QFP-N package Active-passive redundant failover systems Dual-port Serial ATA and Serial Attached SCSI disk arrays (JBODs) NAS servers RAID subsystems Disk-based backup systems Serial ATA and Serial Attached SCSI routing applications Buffers for externally connected links ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● To order the VSC7177 device, see “Ordering Information,” page 24. GENERAL DESCRIPTION The VSC7177 is a Serial ATA and Serial Attached SCSI multiplexer/buffer that implements a 2:1 port selector function for 1.5 Gbps and 3.0 Gbps links. This function is used when dual hosts, such as I/O controllers, must access single-port disk drives in high availability storage subsystems where redundancy and load sharing are important. The o...