Adaptec 3940UW User's Guide download pdf (Page 50)

3-12

AHA-3940U/3940UW/3940UWD User’s Guide

Stock Number: 511041-00, Rev. B Page: 3-12

Print Spec Number: 494569-00

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

The screen has a column of information for each SCSI ID, including

SCSI IDs that are not assigned to a device. To configure a specific

SCSI device, you need to know its SCSI ID. See SCSI Disk Utilities on

page 3-18 to learn how to determine the SCSI ID for each device.

To change a setting, use the arrow keys (↑↓) to highlight the setting,

then press Enter to display a pop-up menu of choices. Use the arrow

keys (↑↓) to highlight a choice, and press Enter to select it.

Initiate Sync Negotiation

This setting determines whether the channel initiates synchronous

negotiation with the SCSI device. When set to yes, the channel ini-

tiates synchronous negotiation. When set to no, the channel does not

initiate synchronous negotiation. The default setting is yes.

The channel always responds to synchronous negotiation when the

SCSI device initiates it. Data is transferred in asynchronous mode if

neither the channel nor the SCSI device negotiates for synchronous

mode.

Note:

Some older SCSI-1 devices do not support synchro-

nous negotiation, so your computer might operate errati-

cally if Initiate Sync Negotiation is enabled. Set Initiate Sync

Negotiation to no for these devices.

Maximum Sync Transfer Rate

This setting determines the maximum synchronous data transfer

rate that the channel can support.

■

The AHA-3940U has a 8-bit channel that provides an effective

maximum synchronous transfer rate of 20.0 MBytes/sec.

■

The AHA-3940UW/3940UWD has a 16-bit channel that pro-

vides an effective maximum synchronous transfer rate of

40.0 MBytes/sec (20.0 MBytes/sec per 8-bit channel).

The default is 10.0 MBytes/sec for the AHA-3940U, and

20.0 MBytes/sec for the AHA-3940UW/3940UWD.The following

table lists valid settings.

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Adaptec 3940UW User's Guide Page 50