Read Buffer; Command Description; Command Descriptor Block - Tandberg Data SLR7-140 PROGRAMMER Manual

19.
BYTE BIT 7
00 Operation Code 3Ch
01 Logical Unit Number (LUN)
02 Buffer ID
03 Buffer Offset
04
05
06 Allocation Length
07
08
09 Control Byte
Table 19-1:

Read Buffer

19.1. Command Description

The READ BUFFER command is mainly used in conjunction
with the WRITE BUFFER command as a diagnostic function
for testing the Drive's data buffer and the SCSI-bus
integrity.
The READ BUFFER command may also be used for debugging
by transferring debugging data to the initiator.
This command will not alter the status of a possibly
inserted tape cartridge in any way.
The READ BUFFER parameter list will be returned during
the DATA- IN phase of the command. When transferring
data, the total data transfer will be split into smaller
bursts with a maximum size. The maximum burst size (the
maximum amount
nects/disconnects) is controlled by the Maximum Burst
Size parameter set up by the MODE SELECT command.
If disconnection is allowed, the Drive disconnects when
executing this command.

19.2. Command Descriptor Block

6 5
READ BUFFER Command Descriptor Block
19 -1 Tandberg SLR Product Line SCSI Functional Specifications
of data transferred
4 3
RESERVED Mode
between recon-
2 1 0