參數(shù)資料
型號(hào)： VSC7177
廠商： Maxim Integrated Products, Inc.
英文描述： Enhanced 2:1 Port Selector for Serial ATA and Serial Attached SCSI
中文描述： 增強(qiáng)型2:1端口選擇器，用于串行ATA和串行連接SCSI
文件頁數(shù)： 1/24頁
文件大小： 253K
代理商： VSC7177
VSC7177 Data Sheet
Enhanced 2:1 Port Selector for Serial ATA and Serial Attached SCSI
Revision 4.2
July 29, 2005
Confidential
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Maxim Integrated Products
1 of 24
To order the VSC7177 device, see
“Ordering Information,”
page 24.
G
ENERAL
D
ESCRIPTION
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
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
VSC7177 transparently. The VSC7177 provides high output swings, pre-emphasis, and programmable receiver
sensitivity that are needed to drive long backplanes and external cables.
Port connectivity for the device can be configured using driving external I/O pins or through protocol-based port. See
the block diagram on
page 2
.
F
EATURES
●
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
A
PPLICATIONS
●
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
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