BusLogic BT-956C, User Manual

Configure Device

Configure Device options let you configure common SCSI and BIOS-relat-

ed options. When selected, the following appears:

SCSI 

Device ID

Enable Wide Negotiation

Yes Yes Yes Yes Yes Yes Yes HA

Enable Fast Transfer

Yes Yes Yes Yes Yes Yes Yes HA

Enable Sync Negotiation

Yes Yes Yes Yes Yes Yes Yes HA

Enable Disconnection

Yes Yes Yes Yes Yes Yes Yes HA

l 

**6lOS related options, applicable if BIOS is enabled***

BIOS Sends Start Unit Command No No No No No No No HA

Ignore in BIOS Scan

No No No No No No No HA

SCSI Device ID

BIOS Sends Start Unit Command No No No No No No No N

O

Enable Wide Negotiation

Yes Yes Yes Yes Yes Yes Yes Yes

Ignore in BIOS Scan

Enable Fast Transfer

Yes Yes Yes Yes Yes Yes Yes Yes

No No No No No No No No

Enable Sync Negotiation

Yes Yes Yes Yes Yes Yes Yes Yes

Enable Disconnection

Yes Yes Yes Yes Yes Yes Yes Yes

‘**BIOS related options, applicable if BIOS is enabled***

The host adapter, indicated as HA, is not a target device and, therefore,

cannot be configured from this table. All options are either Yes or No. Use

the Up and Down 

 keys to move to the desired option. Press <EN-

TER> to toggle between selections. If you make any configuration changes,

before you leave the Configuration Menu, 

 prompts you to con-

firm your changes.

When you select Yes, any configuration changes you have made are stored

in EEPROM. If you enter No, your changes are canceled.

Notes on Using Fast Transfer and Sync Negotiation

Refer to the following table for more information on how the 

Enable Sync

Negotiation 

and 

Enable Fast Transfer 

options work together:

Table 3-3. Using Fast Transfer and Sync Negotiation

Enable Sync Enable Fast Result
Negotiation

Transfer

Yes

Yes

N o

No

Yes

Adapter initiates transfer rate negotiation, starting at 20

No

Adapter initiates transfer rate negotiation, starting at 10

Yes

No

SCSI device may initiate negotiation for data transfer
rates starting at 20 

SCSI device may initiate negotiation for data transfer

rates starting at 10 

The initiator will start negotiations by requesting a transfer rate of 20

 (or 10 

 depending on the 

Enable Fast Transfer 

op-

tion setting). It will continue negotiating, if necessary, down to a transfer

rate of 8 

 If the target device cannot support a 8 

transfer rate, the initiator will stop negotiations and the system will sus-

pend operation. When the system is re-booted, the adapter will turn off

synchronous negotiation.

Note: Because they support 

 data transfers, the maximum transfer rate for

Consider disabling or limiting the synchronous data transfer rate for any

of the following reasons. The lower transfer rate may improve data reli-

ability unless additional system considerations are made:

non-Wide SCSI host adapters is 10 

 half that of Wide 

 adapters.

Limiting the Data Transfer Rate

n

Older SCSI devices may not run at these higher transfer rates. When this

occurs, disable synchronous negotiation. Any device requiring the fast-

er transfer rate will initiate its own request to the adapter. The slower

device won’t initiate a request to run fast so it will run at the slower rate.

n

SCSI devices with passive termination are used.
The adapter is not positioned at one end of the SCSI cable

n

The SCSI cable is longer than six feet or external devices are used.

3-8   Using the 

 Utility

Using the 

 Utility 

n 

3-9