Adaptec ASC39320A-ROHS-KIT Guía de usuario descargar pdf (Pagina 47)

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Adaptec Ultra320 SCSI Cards User’s Guide

SCSI Device Configuration Options

SCSI Device Configuration options can be set individually for each

connected SCSI device.

Note: To configure settings for a SCSI device, you must know

its SCSI ID (see Using SCSI Disk Utilities on page 3-16).

■ Sync Transfer Rate (MB/sec)—(Default: see following table) The

BIOS may negotiate for a transfer rate between controller and

device of up to 80 MB/sec for Wide transfers and 40 MB/sec for

Narrow transfers. The BIOS can use this setting to set the

starting point for negotiating the synchronous data transfer rate

to a slower speed. For example, in the case of Wide transfers, if

the Sync Transfer Rate is set to:

■ 320, 160, or 80—The BIOS negotiates at 80 MB/sec.

■ 40 or lower—The BIOS negotiates at the Sync Transfer Rate

setting.

Eventually, the BIOS completes negotiation. Later, the device

driver takes over. The device driver uses this setting as a

starting point for negotiating data transfers.

The following table describes the maximum synchronous

transfer rates. The default settings are designated by an

asterisk (*).

Note: If Initiate Wide Negotiation is set to No, the rates for

Wide devices are half those shown in the table.

■ Packetized—(Default:Yes) Packetized protocol is required to

operate at 320 MB/sec. When enabled, this option is available if

it is implemented in the device drivers. However, this option is

not supported by the BIOS.

Negotiation Rate Allowable Maximum Rates (MB/sec)

Narrow mode *40.0, 33.3, 20.0, 16.6, 10.0, 5.0, ASYN

Wide mode *320, 160, 80.0, 66.6, 40.0, 33.3, 20.0, 10.0, ASYN

U320 UG.book Page 6 Tuesday, September 23, 2003 1:47 PM

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Adaptec ASC39320A-ROHS-KIT Guía de usuario Pagina 47