Write Buffer
232 SL500: Interface Reference Manual • July 2008 Revision: F • 96122
Write Buffer
The Write Buffer command (3Bh) updates the functional microcode for the library.
A sequence of one or more Write Buffer commands that updates the microcode is
called a download.
A change in the initiator from one Write Buffer command to another in a multiple-
transfer download is considered a new download process request, and terminates
the active process.
This allows another initiator to download microcode if the first initiator goes down
before completing its download request.
Caution – Potential IPL problem: Make sure that the download of the microcode has
completed successfully before you attempt to IPL the library. The IPL will fail if the
download has been unsuccessful. For more information about downloading microcode,
refer to the library installation manual.
A successful download writes new microcode to the flash memory and resets the
library after the final Write Buffer command completes.
The library performs block verification on the first 32 bytes of data and a CRC over
the entire image after the last command. A unit attention is set for all initiators
other than the initiator that requested the download with the additional sense code
set to Microcode Has Been Changed.
TABLE 6-101 Write Buffer Command
Byte
Bit
76543210
0 Operation Code (3Bh)
1Ignored Reserved (0h) Mode
2 Buffer ID (00h)
3
to
5
(MSB)
Buffer Offset
(LSB)
6
to
8
(MSB)
Parameter List Length
(LSB)
9 Clear Partial
Images
Control Byte (00h)
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