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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 SCSISelect 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.
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
B
B-1
Page: B-1
ECN Date: 2/17/97
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