Adaptec 3940UW User's Guide download pdf (Page 14)

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AHA-3940U/3940UW/3940UWD User’s Guide

Stock Number: 511041-00, Rev. B Page: 1-2

Print Spec Number: 494569-00

Current Date: 2/14/97 ECN Date: 2/17/97

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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Adaptec 3940UW User's Guide Page 14