Performance Tips; Enabling Synchronous Negotiation; Enabling Wide Negotiation - Adaptec AHA-2740W User Manual

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Performance Tips

The AHA-2740W/2742W/2744W is designed to maximize the per-
formance of your SCSI devices and computer. The following tips
will help you take full advantage of the host adapter's advanced
design features.

Enabling Synchronous Negotiation

Synchronous Negotiation is enabled (set to yes) by default on the
AHA-2740W/2742W/2744W. You should normally enable this
option on the host adapter because most SCSI devices support it and
because it allows data to be transferred faster on the bus. however,
because a few SCSI devices (e.g., certain CD-ROM drives) do not
support Synchronous Negotiation and may malfunction if they
receive a request for it, you may want to disable Synchronous Nego-
tiation for that particular device. See Device Configuration on page
3-13.
Note:
Even when Synchronous Negotiation is disabled on
the host adapter, the host adapter will still switch to Syn-
chronous mode if it receives a request from the SCSI device.

Enabling Wide Negotiation

Wide Negotiation is enabled (set to yes) by default on the
AHA-2740W/2742W/2744W. For each 16-bit SCSI device connected
to the host adapter, Wide Negotiation should normally be enabled to
allow for 16-bit data transfer instead of 8-bit. See Device Configura-
tion on page 3-13.
Note:
Even when Wide Negotiation is disabled on the host
adapter, the host adapter will still switch to Wide Negotia-
tion if it receives a request for it from the SCSI device.
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AHA-2740W/2742W/2744W User's Guide
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Current Date: 8/3/94
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Optimizing Performance
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ECN Date: 8/9/94
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