IBM T200F User Manual download pdf (Page 114)

Extended Messages

Table 114. Supported Extended Messages

Name Code Support

Synchronous Data

Transfer Request

01h The default mode is for the drive to never initiate a

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

Request

03h The default mode is for the drive to never initiate a Wide

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.

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

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IBM T200F User Manual Page 114