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Datasheet: AIC-43C97 (Adaptec)

High-performance Scsi Bus Controller Chip


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by previous SCSI generations. The higher
160 MByte/sec data rate achieved on existing
LVD cable configurations mandated this
improved data integrity feature.
SCSI Bus Configuration Testing
The AIC-7899 fully supports Ultra160/m and
Ultra3 SCSI Domain Validation. Domain
Validation provides SCSI bus configuration
testing to help insure Ultra160/m devices
operate at optimum speed.
Long Cables
Using Low Voltage Differential (LVD), each
AIC-7899 channel supports up to a maximum
of 15 devices on a 12 meter cable. In a point-
to-point arrangement, cabling can extend 25
meters. The AIC-7899 operates on any existing
Ultra2 SCSI supported cable configuration. The
cable-length distances provide greater system
configuration flexibility, especially for clustering
and RAID applications. The AIC-7899 can
also support High Voltage Differential (HVD)
busses with external HVD transceivers.
Backward Compatibility
The AIC-7899 incorporates an advanced multi-
mode I/O cell that supports Ultra2, Ultra3,
and Ultra160/m SCSI LVD devices, as well as
single-ended devices. With Ultra160/m devices,
the SCSI bus performs at full Ultra160/m
speeds and full LVD cable lengths. With two
Ultra160/m channels, one can be used for
Ultra160/m LVD peripherals and the other for
previous-generation SCSI devices.
In mixed environments of LVD and single-
ended devices, the AIC-7899 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 and
LVD segment cable lengths.
Ultra160/m SCSI uses the same connectors
and cables as Ultra2 and Ultra SCSI, so
upgrading system performance is easy and
Providing outstanding performance and flexibility
for servers and high-end workstations, the dual-
channel AIC-7899 single-chip host adapter meets
tomorrow's requirements today. It delivers
Ultra160/m SCSI data rates up to 160 MByte/sec
on each channel to address emerging bandwidth-
hungry applications, such as real-time video, data
mining, Internet/Intranet, and scientific modeling
and simulation. The AIC-7899 chip features a
66 MHz, 64-bit, PCI interface for next-generation
high-end servers and workstations.
Migration to new Ultra160/m SCSI technology
is easy with the AIC-7899. It accommodates
Ultra160/m, Ultra3, Ultra2, and earlier SCSI
generations. The chip is available in a 388-pin
Ball Grid Array (BGA) package.
Key Benefits
Increased SCSI Performance
With the AIC-7899 dual-channel host adapter,
performance takes a giant leap forward.
Ultra160/m technology doubles Ultra2 SCSI
data transfer rates--up to 160 MByte/sec. With
two channels, the AIC-7899 delivers a total of
320 MByte/sec bandwidth.
In addition, the AIC-7899 single-chip host
adapter features a PCI bus interface that supports
zero wait-state memory from 66 MHz, 64-bit to
33 MHz, 32-bit. The 66 MHz, 64-bit interface
quadruples the bandwidth provided by a 33 MHz,
32-bit PCI interface, from 133 MByte/sec to
533 MByte/sec, enabling maximum system
throughput for each Ultra160/m channel.
The separate SCSI channels of the AIC-7899
utilize two unique PCI device IDs. In workstation
and server RAID applications, the two Ultra160/m
SCSI channels can be independent RAID and
SCSI configurations, controlled by two different
device drivers for maximum flexibility and effective
use of system storage.
Improved Data Integrity
The AIC-7899 single-chip, dual-channel host
adapter fully supports Ultra160/m Cyclic
Redundancy Checking (CRC). The selected CRC
detects data integrity errors that would not be
detected by simple parity checking used
Product Benefits
Up to 320 MByte/sec data transfer
rates on dual Ultra160/m SCSI
66 MHz, 64-bit, PCI interface that
supports zero wait-state memory;
also operates on 33 MHz, 32-bit
PCI busses
Truly independent Ultra160/m
SCSI channels can be split
into separate SCSI and RAID
PC99 compliance
Each channel supports up to
15 devices on a standard Ultra2
SCSI LVD cable configuration up
to 12 meters
Fully compatible with the
AIC-3860 LVD-to-single-ended
Dual-Channel PCI-to-Ultra160/m SCSI Single-Chip
Host Adapter
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
66 MHz, 64-bit, PCI interface supports zero wait-state memory--also operates
on PCI busses down to 33 MHz, 32-bit
Up to 160 MByte/sec on each Ultra160/m SCSI channel for a total bandwidth of
320 MByte/sec
Two 20-MIPS PhaseEngine
RISC processors for fast SCSI command processing
Two 1024-byte data FIFO buffers 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
Independent Ultra160/m SCSI channels using two unique PCI devices IDs can be
configured for separate SCSI and RAID configurations
Advanced multimode Ultra160/m SCSI I/O cell for supporting Low Voltage
Differential (LVD) or single-ended devices
Full Ultra160/m 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 for designing high-performance,
low-power systems
Enhanced Logical Unit Number (LUN) supports up to a maximum of 32 LUNs
PC99 compatible
Microsoft Advanced Cluster Server compatible
PCI Hot-Plug compatible
Fully compatible with the AIC-3860 for single-ended device connection
Software Support
Microsoft 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 30 SCSI devices in two Ultra160/m SCSI channels
Support for a combination of 16-bit Ultra160/m, 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 985679-011 3/99 Printed in U.S.A.
© 2020 • ICSheet
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