VSC7148 查看數據表（PDF） - Vitesse Semiconductor
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VSC7148 Datasheet PDF : 2 Pages
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VSC7148
16-Port JBOD Loop Chip for 1.0625 Gb/s FC-AL Storage Applications
GENERAL DESCRIPTION:
The VSC7148 is typically used to distribute
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 or VSC120
Enclosure Management Controllers to offer unsurpassed
diagnostic capability within the industry. The SSC100 (or VSC120)
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 market 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
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.
SOFTWARE:
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.
The System Services also includes driver libraries for popular I2C
devices such as National's LM75, LM78, and many others.
APPLICATION DIAGRAM:
IPMI
RS-232
Ethernet
Host
Port #1
Repeater
Retimer
(4) FibreTimerTM
Circuits
Host
Port #2
Repeater
Retimer
External External External External
Loop
Loop
Loop
Loop
PBC 0 PBC 1 PBC 2 PBC 3
Snoop
Loop
Snoop
Loop
Snoop
Loop
Snoop
Loop
External
Loop
PBC 15
Snoop
Loop
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
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