VSC7177 查看數據表（PDF） - Maxim Integrated

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VSC7177

Enhanced 2:1 Port Selector for Serial ATA and Serial Attached SCSI

Maxim Integrated 

Revision 4.2

July 29, 2005

VSC7177 Data Sheet

Enhanced 2:1 Port Selector for Serial ATA and Serial Attached SCSI

FEATURES

● 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

APPLICATIONS

● 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 multiplier/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 muxed 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.

Maxim Integrated Products

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.

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