For more information on Vitesse Products visit the Vitesse web site

at www.vitesse.com or contact Vitesse Sales at (800) VITESSE

or sales@vitesse.com

©2003 Vitesse Semiconductor Corporation

741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

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

while isolating error conditions and performing loop diagnostics on

the Snoop Loop. When coupled with the SSC100's initiator features,

the VSC7148 can provide fault isolation conditions and JBOD quality

characteristics back to the host in realtime. When used in a

managed JBOD application, the VSC7148/SSC100 chipset allows

fault isolation down to the lowest Field Replaceable Unit (FRU) to

reduce downtime and support costs, and lead to higher availability.

SOFTW ARE:

The VSC7148 is supported by an API within our enclosure

management Software Development Kit (SDK). The SDK includes

software to implement a FC transport and SES diagnostic

environment. In addition, the SDK also includes a System Services

module which provides APIs to the peripheral functionality

(interrupts, timers etc.) in the Enclosure Management Controller.

devices such as National's LM75, LM78, and many others.

GENERAL DESCRIPTION:

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

VSC7148

The VSC7148 is typically used to distribute

Fibre Channel signals to an array of disk

drives in managed and un- managed arrays.

status information and control of configuration

through an easily-implemented, industry-

standard, protocol.

The VSC7148 easily interfaces with the SSC100 or VSC120

Enclosure Management Controllers to offer unsurpassed

diagnostic capability within the industry. The SSC100 (or VSC120)

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 market that supports

two loops within a single device. The External Loop may be

configured for all Fibre Channel data traffic while the Snoop

APPLICA TION DIAGRAM:

Repeater

Retimer

Repeater

Retimer

Host

Host

RS-232

Ethernet

IPMI

Circuits

PBC 0

External

Loop

Snoop

Loop

PBC 1

External

Loop

Snoop

Loop

PBC 2

External

Loop

Snoop

Loop

PBC 3

External

Loop

Snoop

Loop

PBC 15

External

Loop

Snoop

Loop

Port #1

Port #2