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00h : Main Microprocessor Code
81h : Reserved Area Data

Any other value for the Buffer ID will cause the command to terminate with C H E C K C O N D I T I O N status.
The file shall set sense key to ILLEGAL REQUEST and additional sense code to ILLEGAL F I E L D IN
CDB.

Buffer Offset must be zero. If an invalid value is specified, the command is terminated with C H E C K CON-
D IT ION status . File shall set sense key to ILLEGAL REQUEST and additional sense code to ILLEGAL
F I E L D IN CDB.

Parameter List Length must be 5000h or size of data set to be downloaded.

For the Buffer ID = 00h (Main Microprocessor Code), it must be 5000h.
For the Buffer ID = 81h (Reserved Area Data), it must be the total bytes of Reserved Area Data and the

multiple of 512 bytes in length.

It may also be set to 0000h in which case no code is updated. If an invalid value is specified, the command

is terminated with C H E C K C O N D I T I O N status.

File shall set sense key to ILLEGAL REQUEST and

additional sense code to ILLEGAL F I E L D IN CDB.

This process generates a unit attention condition for M I C R O C O D E HAS BEEN C H A N G E D for all initi-
ators except the one which sent the write buffer command. Once the write buffer command has been com-
pleted the new microcode is immediately ready for operation.

Note: The Download Microcode mode described in this specification is to indicate that the file will accept a
command with this mode, though it is not expected that a customer will ever issue such a command. To
use the write buffer command with this mode, a special microcode version will be required from develop-
ment. If such a microcode is released from development then it will include appropriate instructions on the
function of new microcode and its effect on file operations after download.

Note: If the write buffer command with this mode is executed and the invalid code is downloaded, then it is
to be expected that the file will be never complete or hang up the subsequent command.

This condition

normally be recoverable by a power on/off cycle, but no guarantee.

7.37.4 Download Microcode and Save

(Mode 101b)

In this mode, the data is transferred to the file to save into the System reserved area on the disk. This is for
functional upgrade and configuration change reflecting customers requirements and/or manufacturer's reason,
and stored into media as a permanent.

The newly downloaded code becomes effective after Power On

Reset.

Note:

New code to be downloaded to the file will be provided by development either in request of cus-

tomers for additional function or as a result of functional change by development's reason. Please note
however that not all possible fixes or new function can be applied to a file in this manner and that there is a
very considerable dependency on the level of R O M code contained within the file. If invalid code or code
that is not compatible with the R O M code is downloaded the file will normally reject this code and will
continue normal operation. However there is a very small possibility of invalid code being accepted and if
this occurs the unit will usually become inoperable and have to be returned to the manufacturer to be recov-
ered.

Buffer ID field is used to indicate which portion of the microcode image is being downloaded.

Following

Buffer IDs are supported by the Target:

00h

: Main Microprocessor Code (One time Download by big data set)

00h - 08h : Main Microprocessor Code (9 times download by Small data set)
80h

: E E P R O M Data

81h

: Reserved Area Data

SCSI C O M M A N D SET

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