SYM53C120 LSI Computer Systems, Inc., SYM53C120 Datasheet

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SYM53C120

Manufacturer Part Number
SYM53C120
Description
SCSI HVD Bus Expander
Manufacturer
LSI Computer Systems, Inc.
Datasheet
SYM53C120 Data Sheet
SYM53C120
The SYM53C120 is a single chip solution allowing
the extension of device connectivity and/or cable
length limits of the SCSI bus. The SYM53C120
operates as a SCSI bus repeater when multiple single-
ended to single-ended buses are connected together
and as a converter when attaching a single-ended bus
to a differential bus. In both modes, the device
provides electrical isolation between the two separate
SCSI buses. This product works with Symbios
extensive SYM53C7xx and SYM53C8xx family of SCSI
products as well as other industry SCSI controllers.
An advantage of the SYM53C120 is it does not require
any software or consume a SCSI ID allowing for easy
integration and maximum bus utilization. Adding the
SYM53C120 to a SCSI bus environment creates a low
risk solution for applications requiring scalable device
connectivity and SCSI bus electrical isolation.
Benefits
Expands device connectivity and cable distances
in certain applications
Electrically isolates SCSI buses
Allows for large disk configurations
Does not consume a SCSI ID or limit system
performance
Completely transparent to the SCSI subsystem
SCSI HVD Bus Expander
®
Features
Accepts any asynchronous or synchronous
data transfer rates up to Ultra SCSI
Targets and initiators can be located on either
the SCSI A or B side
Does not consume a SCSI ID
Supports two modes of operation:
Connects two wide/narrow SCSI buses
Signals between buses are regenerated,
reshaped, and transmitted transparently to
the SCSI subsystem
Supports TolerANT
technology
Complete support for SCSI -1, -2, and -3
Completely independent of software
Pin level SCSI bus disable mode
Packaged in a 128-pin PQFP
Repeater: Single-ended to Single-ended
Converter: Single-ended to Differential
Extends Ultra SCSI lengths in certain
Extends Total Ultra SCSI device support
with external transceivers
applications
®
active negation

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SYM53C120 Summary of contents

Page 1

... SCSI buses. This product works with Symbios extensive SYM53C7xx and SYM53C8xx family of SCSI products as well as other industry SCSI controllers. An advantage of the SYM53C120 is it does not require any software or consume a SCSI ID allowing for easy integration and maximum bus utilization. Adding the SYM53C120 to a SCSI bus environment creates a low risk solution for applications requiring scalable device connectivity and SCSI bus electrical isolation ...

Page 2

... The SYM53C120 electrically isolates a SCSI bus into two distinctive segments. It supports both single-ended to single-ended, and single-ended to differential modes (using of external differential transceivers). The A side needs to be connected directly to a single-ended SCSI bus. The B side has the single-ended capable transceivers as well as the individual driver controls for external differential transceivers ...

Page 3

... SCSI Bus Electrical Isolation — This configuration shows how the SYM53C120 could be used to electrically isolate the external SCSI bus from the internal bus. This configuration maintains the integrity of internal SCSI subsystem design yet allows new cables or devices to be added to the external bus. In ...

Page 4

LSI Logic Corporation North American Headquarters Milpitas, CA 95035 Tel: 408.433.8000 LSI Logic Europe Ltd. European Headquarters United Kingdom Tel: 44.1344.426544 Fax: 44.1344.481039 LSI Logic KK Headquarters Tokyo, Japan Tel: 81.3.5463.7821 Fax: 81.3.5463.7820 ISO 9000 Certified LSI Logic logo design, ...

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