VSC7173
Datasheet
Downloaded by spatni@partminer.com on November 22, 2006 from Vitesse.com
Enhanced 2:1 Port Selector and 1:2 Port Multiplier for Serial ATA and Serial Attached SCSI
F
EATURES
●
A
PPLICATIONS
●
●
2:1 port selector and 1:2 port multiplier for both
Serial ATA (SATA) and Serial Attached SCSI
(SAS) links
Serial ATA 1.0 compliant at 1.5 Gbps
(3.0 Gbps capable)
Passes Serial ATA patterns transparently
Programmable receiver sensitivity
High output swing mode with pre-emphasis
Compatible with VSC7175 and VSC7177 designs
0.7 W power dissipation
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
Serial ATA port replicators
Serial ATA Host Bus Adapters selecting between
internal and external connectors
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
G
ENERAL
D
ESCRIPTION
The VSC7173 is a Serial ATA and Serial Attached SCSI multiplexer and 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
outputs from the I/O controllers are multiplexed to a Serial ATA or Serial Attached SCSI drive. The output from the
Serial ATA drive is buffered and replicated to the I/O controllers. When switching from one I/O controller to the
other, a Serial ATA link must be re-initialized with out-of-band (OOB) signals, which are transferred through the
VSC7173 transparently. The VSC7173 provides high output swings with pre-emphasis, and programmable receiver
sensitivity that are needed to drive long backplanes and external cables.
In addition to the above features, the VSC7173 also supports a 1:2 port multiplier mode where one host can connect
two drives.
Port connectivity for the device is configured by driving external I/O pins. See the block diagram on
VMDS-10121 Revision 4.1 ©
VITESSE SEMICONDUCTOR CORPORATION
• 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • E-mail: prodinfo@vitesse.com
May 23, 2005
Internet: www.vitesse.com
1 of 17
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
