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Page 82
Read Buffer Descriptor
Field Descriptions
MAM Page Definitions
MAM Pages
A Mode of 0001b requests that data from the Medium Auxiliary Memory or EEPROM
is returned.
A Mode of 0010b requests that only the data from the buffer is returned.
A Mode of 0011b requests that only the 4-byte descriptor header is returned. A
Buffer ID value for which there is no buffer associated will result in an all zero
header. The Buffer Offset field is reserved.
The Buffer ID field indicates which buffer is to be read. All drives support buffer 0.
Other buffers may be available in the drive.
The Buffer Offset field may be used to specify the offset within the specified buffer
from which the data will be transferred.
The Allocation Length is used to specify the number of bytes that the initiator has
allocated for the returned data.
If the Mode field is set to 0000b or 0011b, then the data returned includes a 4 byte
Read Buffer Descriptor. The following table shows the fields in the Read Buffer
Descriptor.
Bits
Byte
7
6
0
1
2
3
Field
Bytes
Reserved
0
Buffer Capacity
1-3
The following sections detail the pages available in the MAM. Always refer to
document 10005285-001 EEPROM Usage Specification for the latest up-to-date
EEPROM data and Ultrium Generation 1 8-Channel Format Specification Document
for the latest up-to-date MAM data.
The table below shows the Page ID used to identify each page within the MAM.
Note that a Page ID of 0xFFFFFF is used when reading the entire MAM.
An optional page will not exist unless the drive has preformed an operation that
requires information be stored to that optional page. A Read Buffer command to an
5
4
3
Reserved (0)
Buffer capacity, MSB
Buffer capacity
Buffer capacity, LSB
Bits
Description
All bits are 0.
The capacity of the drive's data buffer.
LTO SCSI Interface Manual
2
1
0
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