Read Data Mode (2); Data Buffer (Buffer Id = 0); Static Ram (Buffer Id = 1); Media Statistics (Buffer Id = 2) - Tandberg Data SLR7-140 PROGRAMMER Manual

Tandberg Data

19.3. Read Data Mode (2)

In this mode, the DATA-IN phase contains data only (no
header). The Buffer
buffer within the
transferred.
19.3.1.

Data Buffer (Buffer ID = 0)

The READ BUFFER command will transfer data from the
Drive's data buffer. Note that this is the buffer that
is normally used to store data going to or coming from
the media.
19.3.2.

Static RAM (Buffer ID = 1)

The READ BUFFER command will transfer the contents of
its Static RAM.
19.3.3.

Media Statistics (Buffer ID = 2)

The READ BUFFER
statistics. Since
transferred data are consumed, i.e. removed from the
FIFO. When Media Statistics Buffer Id is selected the
Buffer Offset must be zero.
The number of data to be transferred is the minimum of
Allocation length in the CDB for the READ BUFFER command
and the available media statistics in 8 byte's chunks.
(Thus the Allocation length in CDB should be a multiple
of 8.) If the Buffer Capacity (retrieved by a READ
BUFFER command in Descriptor Mode for the Buffer Id 2)
is zero, no media statistics are available.
19.3.4.

Microcode Store (Buffer ID = 3)

The READ BUFFER command will regenerate and transfer
data from its microcode store in a loadable format. It
means in a format suitable for upload with the WRITE
BUFFER command.
details.
19.3.5.

EEPROM (Buffer ID = 4)

The READ BUFFER command will transfer the contents of
its EEPROM.
19.3.6.

External RAM Adapter (Buffer ID = 5)

If there is an external RAM adapted, the READ BUFFER
command will transfer the contents of this external RAM.
Otherwise no data is transferred.
19-3 Tandberg SLR Product Line SCSI Functional Specifications
ID field identifies
Drive from
command will
this buffer works
See the WRITE
Read Buffer
a specific
which data will
transfer the
as a FIFO
BUFFER command
be
media
the
for