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Datasheet: AIC-7892 (Adaptec)

Single-channel Pci-to-ultra160 Scsi Single-chip Host Adapter


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SCSI Bus Configuration Testing
The AIC-7892 fully supports Ultra160 and
Ultra3 SCSI Domain Validation. Domain
Validation provides SCSI bus configuration
testing to help ensure Ultra160 SCSI devices
operate at optimum speed.
Long Cables
The AIC-7892 supports a maximum of 15
LVD devices on 12 meters of cable. In a
point-to-point configuration, the maximum
cable length extends to 25 meters. The
AIC-7892 is fully compatible with existing
Ultra2 SCSI supported cable configurations.
The cable-length distances provide greater
system configuration flexibility especially
for clustering and RAID applications.
The AIC-7892 also supports High Voltage
Differential (HVD) busses when used
with external HVD transceivers.
Backward Compatibility
The AIC-7892 incorporates an advanced
multimode I/O cell that supports Ultra2,
Ultra3, and Ultra160 SCSI LVD devices,
as well as single-ended (SE) devices. With
only Ultra2 and Ultra160 devices attached, the
SCSI bus performs at full speed and
full LVD cable lengths. When SE devices
are attached, the bus defaults to SE speed
and cable length.
In mixed environments of LVD and single-
ended devices, the AIC-7892 host adapter
chip can couple with an Adaptec AIC-3860
transceiver chip to bridge the signaling
discontinuity. By dividing the SCSI bus
into independent single-ended and LVD
segments, the AIC-3860 supports legacy
devices without limiting performance or
LVD segment cable length. (see figure)
Ultra160 SCSI uses the same connectors
and cables as Ultra2 and Ultra Wide SCSI,
so upgrading system performance is easy
and cost-effective.
The Adaptec
AIC-7892 single-chip host adapter
provides outstanding performance and flexibility
to meet tomorrow's requirements today. Ultra160
SCSI delivers data transfer rates up to 160 MByte/sec
to address emerging bandwidth-hungry applications,
such as real-time video, data mining, Internet/
Intranet, and scientific modeling and simulation.
The AIC-7892 chip features a 66 MHz, 64-bit,
PCI interface for next-generation server, work-
station, and high-end desktop systems.
Migration to new Ultra160 SCSI technology
is easy with the AIC-7892. The chip is fully
backward compatible with Ultra2 and earlier
SCSI generations. The chip is available in a
272 Ball Grid Array (BGA) package.
Key Benefits
Increased SCSI Performance
With the AIC-7892, performance takes a giant
leap forward. Ultra160 SCSI technology doubles
Ultra2 data transfer rates up to 160 MByte/sec.
In addition, the AIC-7892 single-chip host adapter
features a PCI bus interface that supports zero
wait-state memory from 32-bit, 33 MHz to 64-bit,
66 MHz. The 64-bit, 66-MHz interface quadruples
the bandwidth provided by a 32-bit, 33 MHz PCI
interface, from 133 MByte/sec to 533 MByte/sec,
enabling maximum system throughput.
Improved Data Integrity
The AIC-7892 fully supports Ultra160 Cyclic
Redundancy Checking (CRC). CRC detects data
integrity errors that would not be detected by
simple parity checking used by previous SCSI
generations. The higher 160 MByte/sec data rate
achieved on existing Low Voltage Differential
(LVD) cable configurations mandated this
improved data integrity feature.
Product Benefits
Up to 160 MByte/sec data
transfer rates
66 MHz, 64-bit, PCI interface that
supports zero wait-state memory;
also operates on 33 MHz, 32-bit
PCI busses
PC99 compliant
PCI 2.2 compliant
Supports up to 15 devices on
a standard cable configuration
up to 12 meters
Fully compatible with the
AIC-3860 LVD-to-single-ended
Single-Channel PCI-to-Ultra160 SCSI Single-Chip
Host Adapter
AIC-7892(4.0) 8/26/99 12:25 PM Page 1
Adaptec, Inc.
691 South Milpitas Boulevard
Milpitas, California 95035
Tel: (408) 945-8600
Fax: (408) 262-2533
Adaptec Europe - Belgium
Tel: (32) 2-352-34-11
Fax: (32) 2-352-34-00
Adaptec Japan - Tokyo
Tel: (81) 3-5365-6700
Fax: (81) 3-5365-6950
Adaptec Singapore
Tel: (65) 245-7477
Fax: (65) 245-7487
1-800-934-2766 (USA and Canada)
or (408) 957-7274
Pre-Sales Support:
1-800-442-7274 (USA and Canada)
or (408) 957-7274
World Wide Web:
Internet ftp server:
Adaptec USA Bulletin Board
Service (BBS): (408) 945-7727
(up to 28,800 baud, using 8 bits,
1 stop bit, no parity)
Interactive Fax: (303) 684-3400
64-bit, 66 MHz PCI interface supports zero wait-state memory
also operates on PCI busses down to 32-bit, 33 MHz
Up to 160 MByte/sec on the Ultra160 SCSI bus
20-MIPS PhaseEngine
RISC processor for fast SCSI command processing
1024-byte data FIFO buffer for efficient PCI bus utilization
Cache line-streaming for improved PCI bus utilization
Dual Address Cycle (DAC) provides greater system memory addressibility
Target mode to support clustering, bridge, and RAID applications
Tagged command queuing enables changing SCSI command execution order
to improve performance
Additional Features
Advanced multimode Ultra160 SCSI I/O cell for supporting Low Voltage
Differential (LVD) or single-ended devices
Ultra160 and Ultra3 SCSI Domain Validation and CRC support
JTAG boundary scan to support system-level interconnect testing
3.3V/5V PCI interface for providing flexibility in designing high-performance,
low-power systems
Enhanced Logical Unit Number (LUN) supports up to a maximum of 32 LUNs
Microsoft PC99 compatible
PCI Hot-Plug compatible
Fully compatible with the AIC-3860 SCSI transceiver chip
Software Support
Windows NT
, Windows
95 and 98, Novell NetWare, SCO Openserver,
SCO UnixWare, IBM OS/2, Sun Solaris, and Linux
SCSI Device Support
Connection for up to 15 devices
Support for a combination of 16-bit Ultra160, Ultra3, Ultra2, Ultra, and standard
SCSI devices, including disk drives, disk arrays, tape drives, CD-ROM and CD-R drives,
jukeboxes, removable drives, scanners, and printers
Slower Ultra SCSI legacy devices can be connected to Adaptec's AIC-3860
LVD-to-single-ended SCSI transceivers for optimal SCSI bus performance
Copyright 1999 Adaptec, Inc. All rights reserved. Adaptec,
the Adaptec logo, the Adaptec tagline, PhaseEngine,
and AIC are trademarks of Adaptec, Inc., which may be
registered in some jurisdictions. Microsoft, Windows,
Windows NT, Windows 95, and Windows 98 are trade-
marks of Microsoft Corporation, used under license. All
other trademarks used are owned by their respective owners.
Information supplied by Adaptec, Inc., is believed to
be accurate and reliable at the time of printing, but
Adaptec, Inc., assumes no responsibility for any errors
that may appear in this document. Adaptec, Inc., reserves
the right, without notice, to make changes in product
design or specification. Information is subject to change
without notice.
P/N 985733-011 8/99 Printed in U.S.A.
LVD Mode
SE Mode
SE Devices
LVD Devices
Ultra2, Ultra160, Ultra3
Disk #1
Disk #2
Disk #3
PCI-to-Ultra2 (LVD)
Optimizing performance in
a mixed Ultra2, Ultra160,
Ultra3, and single-ended
peripheral configuration
AIC-7892(4.0) 8/26/99 12:25 PM Page 2
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