INIC
-525
U
L T R A
3 1 6 0 M
B Y T E
S C S I L V D
E
X P A N D E R /
C
O N V E R T E R
S
O L U T I O N S
F
E A T U R E S
Supports 160 Mbyte data transfers
Operates both as a SCSI bus
converter or expander
Supports SE, LVD, HVD
connections
SCSI bus electrical isolation for
clustering environments
Target / Initiator independent
No SCSI ID is used
No software overhead
Supports Double Transition
Clocking
Supports Quick Arbitrate and
Selection
Up to 3 devices may be cascaded
Supports asynchronous /
synchronous transfers
Dynamically tunes itself to
process, voltage & temperature
BSY LED bus activity indicator
SCSI-1, SCSI-2, SCSI-3 & EPI
Compliant
Completely transparent
Isolates bus into 2 SCSI segments
Package type
> 160pin PQFP
> LSI SYM53C140 pin-compatible
SCSI expanders, once used solely
to transparently convert between
single ended transmission
mediums, have evolved from
providing just a bus conversion to
being able to provide full SCSI
cable lengths on each side of the
conversion, and allowing for back
to back bus extension for even
longer cable lengths.
The Initio INIC-525 chip is an Ultra3 SCSI bus expander/converter. As a converter, it
allows Single-Ended (SE) SCSI devices to be attached to a Low Voltage Differential (LVD)
or a High Voltage Differential (HVD) SCSI bus. It optimizes SCSI bus timing for improved
SCSI performance without any impact to the SCSI protocol.
The INIC-525 allows users to extend SCSI cable lengths and expand total SCSI device
connectivity without impact to SCSI Protocol or software while providing electrical
isolation between separate SCSI buses. This makes the INIC-525 the perfect solution
for todays clustering, storage area network (SAN) and storage enclosure applications.
The INIC-525 creates distinct, electrically isolated bus segments. Each SCSI segment
can be logically disconnected from the others without disrupting SCSI transfers currently
in progress, facilitating system maintenance, hot-plugging, diagnostics, and upgrades.
Furthermore it can support single-ended (SE), high voltage differential (HVD), or low
voltage differential (LVD) signaling -- making it highly configurable for various system
configurations.
By using LVD to LVD connections and cascading expanders, users can achieve Ultra3
SCSI transfer rates (160MB/sec) across extended SCSI cable lengths. This means that
users can continue to use their existing SCSI infrastructure even when system demands
require high data transfer rates across longer distances.
Versatility Ideal for
Clustering and High
Availability Applications
The INIC-525 is ideal for high
availability and scalable server
clustering environments. In addi-
tion, applications where longer
cables on an LVD or SE/LVD SCSI
interface are required suite the
INIC-525 well. It can also be used
to reshape poor quality LVD sig-
nals, such as on SCSI LVD back-
planes. Configurations that use
the SCSI bus expander in Ultra3
mode allow the system designer
to take advantage of the inherent
cable distance, device connectiv-
ity, data reliability, and increased
transfer rate benefits of LVD sig-
naling with Ultra3 SCSI peripher-
als such as removable media,
streaming tape drives, optical
drives, hard disk drives, optical
CD-ROM, DVD and CDR drives,
optical juke boxes, etc.
The INIC-525 chip is a SCSI bus expander/converter. As a converter, it allows Single-Ended (SE)
SCSI devices to be attached to a Low Voltage Differential (LVD) or a High Voltage Differential (HVD)
SCSI bus. It can also be used as a bus expander to extend SE, LVD, or HVD cables. It optimizes
SCSI bus timing for improved SCSI performance without any impact to the SCSI protocol.
Copyright2000 by Initio Corporation. All rights reserved. The INIC- prefix is a trademark of Initio Corporation. All other product names that appear in this material are for identification purposes only
and are acknowledged to be trademarks or registered trademarks of their respective companies. Information supplied by Initio is believed to be accurate and reliable, but Initio assumes no responsibility
for any errors that may appear in this material. Initio Corporation reserves the right, without notice, to make changes in product design or specification. Printed in U.S.A. 3/1/00 P/C: D160-01
Initio Corporation
2205 Fortune Drive, Suite A
San Jose, CA 95131-1806
Tel: 408.577.1919
Fax: 408.577.0640
Toll Free: 1.800.994.6484
Email: sales@initio.com
http://www.initio.com
Re-timing circuit
LVD/SE
I/O module
LVD/SE
I/O module
Delay/Process
Control
State Machine
SCSI Bus
side A
SCSI Bus
side B
Control
Signals
LVD SCSI
Bus Expander
LVD SCSI
Bus Expander
SEGMENT A
SEGMENT B
SEGMENT C
SERVER
SERVER
DISK ARRAYS
LVD SCSI
Bus Expander
LVD SCSI
Bus Expander
LVD SCSI
Bus Expander
DISK ARRAYS
DISK ARRAYS
SERVER
SERVER
SEG. A
SEG. D
SEG. C
SEG. B
SEGMENT
MODE
LENGTH LIMIT
A, C
LVD (Ultra2/3) 25 meters
SE (Ultra)
3 meters
B
LVD (Ultra2/3) 12 meters
SE (ultra)
1.5 meters
SEGMENT
MODE
LENGTH LIMIT
A, D
LVD (Ultra2/3) 25 meters
SE (Ultra)
3 meters
B, C
LVD (Ultra2/3) 12 meters
SE (ultra)
1.5 meters
The INIC-525 is based
upon bus expander
technology resulting in
maintenance of skew
budgets through signal
filtering and retiming. In
addition, the INIC-525
does not require any
software.
SERVER CLUSTERING EXAMPLES:
SPECIFICATIONS:
Package:
160-pin Plastic Quad Flat Pack (PQFP)
Transfer Rate:
Up to 160 MByte/sec
Device Interface: Ultra3 (LVD) or Ultra2 (LVD/SE) or
UltraSCSI, SCSI-3, SCSI-2, SCSI-1, single ended
Operating Temp: 0 to 55C (32to 131F)
10% to 90% relative humidity (noncondensing)
INIC
-525
U
L T R A
3 1 6 0 M
B Y T E
S C S I L V D
E
X P A N D E R /
C
O N V E R T E R
S
O L U T I O N S
INIC-525 block diagram
PDF 
ZIP