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Chapter 3: SCSI Messages
3-4
July 2004
81-81276-01 Rev A01
3.2.5 EXTENDED MESSAGE (01h)
An initiator or target sends this message as the first byte of a multiple-byte message (> 2 bytes).
Figure 3-1
shows the EXTENDED MESSAGE format.
Figure 3-1.
EXTENDED MESSAGE (01h) Format
The Extended Message Length specifies the length of the EXTENDED MESSAGE plus the number of
additional parameter bytes that are to follow. The length does not include bytes 0 and 1. A value of 0
for the Extended Message Length indicates 256 bytes to follow.
Table 3-2
lists the EXTENDED MESSAGE codes.
If the tape drive receives an extended message that it does not support, it switches to MESSAGE IN
phase and returns MESSAGE REJECT after transferring all the bytes of the message.
Bit
Byte
7
6
5
4
3
2
1
0
0
Extended Message Identifier (01h)
1
Extended Message Length
2
Extended Message Code
3
Extended Message Additional Parameters
Table 3-2.
EXTENDED MESSAGE Codes
Code
Description
00h
MODIFY DATA POINTER (not supported)
01h
SYNCHRONOUS DATA TRANSFER REQUEST (see
“SYNCHRONOUS
DATA TRANSFER REQUEST (SDTR)” on page 3-8
)
02h
Reserved
03h
WIDE DATA TRANSFER REQUEST (see
“WIDE DATA TRANSFER
REQUEST (WDTR)” on page 3-8
)
04h – 7Fh
Reserved
80h – FFh
Vendor Unique (see
Section 4.4.2, “Vendor Unique Inquiry Data.”
)
Summary of Contents for DLTtape DLT1
Page 1: ...DLT1 VS80 SCSI Interface Guide...
Page 6: ...DLT1 VS80 SCSI Interface Guide vi July 2004 81 81276 01 Rev A01 Notes...
Page 12: ...Table of Contents xii July 2004 81 81276 01 Rev A01 Notes...
Page 16: ...List of Figures xiv July 2004 81 81276 01 Rev A01 Notes...
Page 20: ...List of Tables xviii July 2004 81 81276 01 Rev A01 Notes...
Page 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Page 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Page 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
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