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AHA-3940U/3940UW/3940UWD User's Guide
discuss the same topics—installing and configuring the
AHA-3940U/3940UW/3940UWD—but the User's Guide provides
more detailed instructions. If you have installed SCSI devices before,
you might find it faster to use the Installation Guide. Beginning users
should use the more detailed instructions in this User's Guide.
Product Features
AHA-3940U/3940UW/3940UWD host adapters provide a powerful
dual channel, multitasking interface between your computer's PCI
bus and SCSI disk drives, CD-ROM drives, scanners, and other SCSI
devices. You can install multiple AHA-3940U/3940UW/3940UWD
host adapters in your computer. Each host adapter functions as two
independent host adapters, and its connected SCSI devices form a
separate SCSI bus.
AHA-3940U/3940UW/3940UWD host adapters can manage multi-
ple disk drivers and provide high performance. In addition, these
host adapters minimize microprocessor overhead by transferring
data into system memory without involving the computer's CPU.
The onboard AHA-3940U/3940UW/3940UWD PhaseEngine
sequencer independently manages data transfer between SCSI
devices and the computer's memory without involving the host
microprocessor. The PhaseEngine enables the best data transfer per-
formance available in multitasking operating systems. It also auto-
mates SCSI command processing and significantly reduces
interrupts and command overhead. Onboard BIOS allows
AHA-3940U/3940UW/3940UWD host adapters to be used in place
of, or together with, a standard hard disk controller.
AHA-3940U/3940UW/3940UWD host adapters can handle 32-bit
bus master data transfers, including PCI-enhanced transfer com-
mands. They support the same SCSI functions as other Adaptec host
adapters, including new SCSI-2 features such as Tagged Queuing.
AHA-3940U/3940UW/3940UWD host adapters support multi-
threaded I/O operations, allowing simultaneous operations on mul-
tiple SCSI targets or logical units. The Disconnect/Reconnect feature
maximizes SCSI bus usage in systems with multiple targets. The
Scatter/Gather feature allows high performance even in computers
with fragmented memory buffers.
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AHA-3940U/3940UW/3940UWD User's Guide
Stock Number: 511041-00, Rev. B
Print Spec Number: 494569-00
Current Date: 2/14/97
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
®
Page: 1-2
ECN Date: 2/17/97
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