Adaptec 3940UW User's Guide download pdf (Page 71)

AHA-3940U/3940UW/3940UWD User’s Guide

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

Print Spec Number: 494569-00

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

B-1

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Optimizing Performance

Read this appendix to find out how to optimize your computer’s

performance and take full advantage of the AHA-3940U/3940UW/

3940UWD advanced design features.

Enabling Synchronous Negotiation

Synchronous negotiation

is a SCSI feature that allows the SCSI channel

and its attached SCSI peripheral devices to negotiate for the transfer

of data in synchronous mode on the SCSI bus. Synchronous data

transfer is faster than asynchronous data transfer.

The SCSI

Select

Initiate Sync Negotiation option is

Enabled

by default

for each device on the SCSI bus. You should normally leave this

option enabled because most SCSI devices support it and because it

allows for faster data transfer; however, a few SCSI devices (e.g.,

some CD-ROM drives) do not support synchronous negotiation and

may malfunction if they receive a request for it. If any such device is

installed on your computer, you should disable Initiate Sync Negoti-

ation for that device. See

Initiate Sync Negotiation

on page 3-12.

Note:

Even when synchronous negotiation is disabled on the

channel, the channel still switches to synchronous mode if it

receives a request for synchronous data transfer from a SCSI

device on the bus.

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Adaptec 3940UW User's Guide Page 71