Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications page 176

Command Specifications
The microcode or control information is written to the logical unit buffer starting at the location specified
by the BUFFER Address field. If the IDD is unable to accept the specified buffer address, it shall return
CHECK CONDITION status and it shall set the sense key to ILLEGAL REQUEST [=5] with an
additional sense code of INVALID FIELD IN CDB [=24-00].
The "Transfer Byte Length" field specifies the maximum number of bytes that shall be present in the
Data-Out Buffer to be stored in the specified buffer beginning at the buffer offset. The INIT should
attempt to ensure that the parameter list length plus the buffer offset does not exceed the capacity of the
specified buffer. (The capacity of the buffer may be determined by the BUFFER CAPACITY field in the
READ BUFFER descriptor.) If the BUFFER Address and Transfer Byte Length fields specify a transfer
in excess of the buffer capacity, the IDD shall return CHECK CONDITION status and shall set the sense
key to ILLEGAL REQUEST [=5] with an additional sense code of INVALID FIELD IN CDB [=24-00].
When the IDD is checked and downloading of the microcode is judged to be possible, the IDD may be in
the Not Ready state (the state in which the spindle motor is not rotating). In this event, the IDD starts the
motor, then saves the microcode to flash ROM and the system area to disk media. Then, the IDD stops
the motor and returns to the Not Ready state.
(7) Mode = 0, 1, 1, 1 : Microcode Download with offset, with saving
In this mode the INIT may split the transfer of the controller's microcode or control information over two
or more WRITE BUFFER commands.
If the last WRITE BUFFER command of a set of one or more commands completes successfully, the
microcode or control information shall be saved in the non-volatile memory space and the disk's system
area.
Since the downloaded microcode or control information may be sent using several commands, when the
IDD detects the last download microcode with offsets and save mode WRITE BUFFER command has
been received, the IDD shall perform the verification of the complete set of downloaded microcode or
control information prior to returning GOOD status for the last command. After the last command
completes successfully the IDD generates a unit attention condition for all INITs except the one that
issued the set of WRITE BUFFER commands. When reporting the unit attention condition, the IDD sets
the additional sense code to MICROCODE HAS BEEN CHANGED.
The microcode or control information is written to the logical unit buffer starting at the location specified
by the BUFFER Address field. If the IDD is unable to accept the specified buffer offset, it shall return
CHECK CONDITION status and it shall set the sense key to ILLEGAL REQUEST [=5] with an
additional sense code of INVALID FIELD IN CDB [=24-00].
(8) Mode = 1, 0, 1, 0 : Echo buffer
In this mode the IDD transfers data from the INIT and stores it in the echo buffer. The BUFFER ID and
BUFFER OFFSET fields are ignored in this mode.
3-114 C141-C010