Table 19-2: Read Buffer Modes; Table 19-3: Read Buffer Id's - Tandberg Data SLR7-140 PROGRAMMER Manual

Mode
Buffer ID
Buffer Offset
Allocation Length
Tandberg Data
This field controls the function of the READ BUFFER
command. It also
fields within
following modes are supported:
Mode Description
2 Read Data
3 Read Descriptor

Table 19-2: Read Buffer Modes

This field is used to select one out of several buffers
in the Drive. The following Buffer IDs are supported:
Buffer ID Description
0 Data Buffer
1 Static RAM
2 Media Statistics
3 Microcode Store
4 EEPROM
5 External RAM adapter
6 NVP Data
7 Tape Buffer Control Data
8 Volume Directory
9 Dbase Variables
10 Header File Dates
11 Trace Buffer Control Blocks
12 Complete Trace

Table 19-3: Read Buffer ID's

The Buffer Offset field specifies an offset into the
buffer given by the Buffer ID field. The Buffer Offset
is always a byte offset into the buffer. If the Buffer
Offset is set to N, then the first data byte transferred
by the READ BUFFER command will be byte N relative to
the first available byte of the specified buffer. The
offset must be
specified by the Buffer ID field.
The Buffer Offset field can only be used in mode 2 (Read
Data) and when Buffer ID 2 - Media Statistics is NOT
selected. The Buffer Offset field is reserved in other
modes.
This field specifies the maximum number of bytes that
the Drive is requested to return during the DATA IN
phase of the command. If the Allocation Length is zero,
the Drive will return no data. The Drive terminates the
DATA IN phase when Allocation Length bytes have been
transferred or when all the available data from the
buffer has been transferred to the Initiator, whichever
is less.
19-2 Tandberg SLR Product Line SCSI Functional Specifications
controls the
this command descriptor
less than the
Read Buffer
meaning of the
block.
size of the buffer
other
The