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Tandberg Data
31.4. Write Data Mode (2)
In this mode, the DATA-OUT phase contains buffer data
only.
Data
is
starting at the location specified by the Buffer Offset.
The Parameter List Length field specifies the number of
transferred bytes.
31.5. Download Microcode Mode (4)
In
this
mode,
transferred to the Drive's data buffer. The microcode
change will not take effect until after a WRITE BUFFER
with mode 5 (Download Microcode and Save Mode) has been
executed. Note that the transferred microcode will be
lost after a power-cycle or reset as long as it has not
been saved.
Note that the WRITE BUFFER command in this mode does not
perform
any
validation
data. The validation is performed first when a microcode
is going to be saved. Data is written to the Drive's
data buffer starting at the location specified by the
Buffer Offset.
To ensure that the microcode is not corrupted by another
SCSI command, it is recommended that either the WRITE
BUFFER commands are linked or that the Drive is reserved
by using the RESERVE command.
31.6. Download Microcode and Save Mode (5)
In
this
mode,
transferred
to
BUFFER command is completed successfully the microcode
will be saved in a non-volatile memory space (a Flash
EPROM). The downloaded code will then be effective after
each power-cycle and reset until it is supplanted in
another Download Microcode and Save Mode or Download
Microcode with Offsets and Save Mode operation.
The Initiator may either transfer a complete microcode
in one single WRITE BUFFER command (using mode 5 with a
Parameter List Length of flash capacity ) or to split
the
download
operation
BUFFER commands (using first mode 4 and then end the
sequence with the mode 5). It is up to the Initiator to
make
sure
that
Parameter List Length results in a continuous set of
microcode data.
On the last WRITE BUFFER command mode 5, the Drive shall
perform
verification
microcode prior to returning GOOD status and saving the
microcode. (refer to the Microcode Verification and Save
section later in this chapter).
31-3
Tandberg SLR Product Line SCSI Functional Specifications
written
to
the
drive-specific
of
the
drive-specific
the
Drive
data
into
several
the
use
of
the
of
the
Write Buffer
Drive's
data
microcode
can
transferred
microcode
microcode
can
buffer.
If
the
(smaller)
Buffer
Offset
complete
set
of
buffer
be
be
WRITE
WRITE
and
the
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