Extended Messages

Table 114. Supported Extended Messages

Name

Code

Support

 

 

 

Synchronous Data

01h

The default mode is for the drive to never initiate a

Transfer Request

 

Synchronous data transfer negotiation. The initiator is

 

 

expected to do so. Since this mode is most important at

 

 

power-on, no SCSI method of changing this mode is

 

 

provided. Instead, an internal method of changing this

 

 

mode is provided (VPD or jumper setting). If the message

 

 

is received after selection and before the Command

 

 

phase, it then goes to the Message In phase and

 

 

responds with a valid response to complete the

 

 

negotiation. If the message is received at any other time, a

 

 

Message Reject is sent in response, placing the drive data

 

 

transfer mode for that initiator to asynchronous.

 

 

 

Wide Data Transfer

03h

The default mode is for the drive to never initiate a Wide

Request

 

data transfer negotiation. The initiator is expected to do

 

 

so. Since this mode is most important at power-on, no

 

 

SCSI method of changing this mode is provided. Instead,

 

 

an internal method of changing this mode is provided

 

 

(VPD or jumper setting). If the message is received after

 

 

selection and before the Command phase, it then goes to

 

 

the Message In phase and responds with a valid response

 

 

to complete the negotiation. If the message is received at

 

 

any other time, a Message Reject is sent in response,

 

 

placing the Bus Width to 1 byte wide and data transfer

 

 

mode to asynchronous for that initiator.

 

 

 

100Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference

Page 114
Image 114
IBM T200F manual Supported Extended Messages

T200F, T200 specifications

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