Exabyte EXB-8205 Betriebsanleitung PDF herunterladen (Seite 326)

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26.1 About This Command

The WRITE BUFFER command allows you to load new microcode

from the SCSI bus into the CTS’s control memories. This command is

used with the READ BUFFER (3Ch) command to copy the microcode

from one CTS to another CTS.

Note: You may want to issue more than one WRITE BUFFER

command if the initiator has less than 176 KBytes of buffer

space available. By setting the WBF bit (byte 09, bit 7) to 1,

you can specify that you are using a sequence of WRITE

BUFFER commands to upgrade the microcode.

When the WRITE BUFFER command or command sequence is

executed, the microcode is transferred from the SCSI bus to the CTS’s

RAM buffer. Then, the image in the buffer is validated. During

validation, the microcode is checked for the following:

Correct header format.

Proper number of files.

Correct internal format.

Hardware/boot code support for new microcode version.

If the new microcode passes these tests, it is loaded into the CTS’s

control memories.

Once the microcode is upgraded, the machine state (including MODE

SELECT parameters) is set to the new power-on defaults, and the CTS

performs its power-on self-test.

After the new code has been loaded successfully, the CTS returns

Good status to the initiator that issued the WRITE BUFFER command.

It returns Check Condition status with the sense key set to Unit

Attention (6h) to commands sent by other initiators. The ASC and

ASCQ fields will be set to 3Fh and 01h, and the Fault Symptom Code

will be C3h.

26-2

EXB-8205 and EXB-8505

(Standard and XL)

510503

26 WRITE BUFFER (3Bh)

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