VSC7148(2000) 查看數據表（PDF） - Vitesse Semiconductor

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VSC7148
(Rev.:2000)

16-Port JBOD Loop Chip for 1.0625 Gb/s FC-AL Storage Applications

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Product Brief

VSC7148

16-Port JBOD Loop Chip for

1.0625 Gb/s FC-AL Storage Applications

Features

• All the functionality needed to implement a com-

plete daisy-chainable 16-drive 1Gb/s FC-AL JBOD

Subsystem

• Two host ports with two pairs of FibreTimerTM

Clock Recovery Units (CRUs) configurable as

either Repeaters or Retimers

• Sixteen Port Bypass Circuits (PBC) for drive con-

trol

• Sixteen PBC internal Snoop LoopTM for loop diag-

nostics

Applications

• Configurable as either a single 16-drive loop or

two 8-drive loops

• I2C interface for configuration/status/control

• Seamless interface to Enclosure Management

Chipsets such as the Vitesse SSC100/VSC055

for managed JBOD applications

• On-chip terminators selectable as 100/150 ohm

• 3.3V Power Supply, 4.3 W

• 256-pin, 27mm Thermally Enhanced BGA

The VSC7148 contains all the functions needed to implement an entire daisy-chainable 1.0625 Gb/s FC-AL

JBOD Loop for storage systems containing up to sixteen disk drives. This device is typically used in distribut-

ing Fibre Channel signals to an array of disk drives in managed and un-managed arrays. The use of an I2C

Interface allows access to status information and control of configuration through an easily-implemented,

industry-standard, protocol.

The VSC7148 easily interfaces with the SSC100 Enclosure Management Controller to offer unsurpassed

diagnostic capability within the industry (refer to Figure 1). The SSC100 communicates with the VSC7148

through the I2C interface to provide complete loop status, configuration, and diagnostic control to the host. In

this configuration, up to fifteen drives on a single loop may be accessed with a single Fibre Channel connector.

Serial data from the loop enters the FC-AL port of the SSC100 where the data is processed, returned to the loop,

and handed to the VSC7148 for drive communications. In addition, the VSC7148 is the only device on the mar-

ket that supports two loops within a single device. The External Loop may be configured for all Fibre Channel

data traffic while the Snoop Loop may be used for monitoring or isolating specific ports for diagnostics. With

this architecture, a design engineer has the flexibility to offer full Fibre Channel support on the External Loop

IPMI

RS-232

Ethernet

SSSSCC110000

EEnncclolossuurere

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CCoonntrtorolllelerr

Host

Port #1

Repeater

Retimer

(4) FibreTimerTM

Circuits

Host

Port #2

Repeater

Retimer

External

Loop

PBC 0

Snoop

Loop

External External External

Loop

Loop

Loop

PBC 1 PBC 2 PBC 3

Snoop

Loop

Snoop

Loop

Snoop

Loop

External

Loop

PBC 15

Snoop

Loop

VSC7148 16-Port JBOD Loop Chip

For diagnostic testing,

the SSC100 initiates

communication with

an individual drive

(e.g. Drive 3) via the

VSC7148 Snoop

LoopTM while all other

drives are fully

accessible to the Fibre

Channel loop.

Figure 1. Managed JBOD Using the VSC7148 and SSC100

Rev. 1.0

5/25/00

© VITESSE SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

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