Commands 161
Commands
CDB Fields:
Mode This field can be set to one of the following values:
00000b The drive transfers a 4-byte header from the host (which should be set to zeros),
followed by (allocation length - 4) bytes of data. The data is written into the buffer
identified by the Buffer ID, starting from offset zero in the buffer.
The Buffer ID and Buffer Offset must both be zero. Allocation Length must not exceed
(buffer size + 4).
00010b The drive transfers allocation length bytes of data from the host, bytes of data which is
placed in the buffer indicated by Buffer ID, starting from Buffer Offset from the start of
the buffer. No header is sent.
The Buffer Offset and Allocation Length must be kept within the buffer size, and the
Buffer ID must to set to one of the valid values.
00100b This mode is used to transfer new firmware to the drive. The drive receives Allocation
Length bytes of data from the host. The data is stored in the drive’s buffer.The location in
the buffer at which the data is written is determined by the firmware.
The firmware image is divided into a number of blocks of data which are sent to the
drive using multiple Write Buffer commands.
All the firmware image data should be transferred using this mode.
The Buffer ID and Buffer Offset are ignored.
00101b This mode is used to indicate that the complete firmware image has been sent to the
drive. This is the signal for entering the FLASH reprogramming stage of the firmware
upgrade process.
Once this command has been received, and the associated data stored in the buffer, the
resident firmware checks the validity of the image that has been received. If this seems to
be correct, the Firmware Upgrade operation will commence. If any faults are detected in
the format of the image, the drive will report
CHECK CONDITION to the host. The sense
key is
ABORTED COMMAND, and the additional sense is set to 2600h (invalid field in
parameter list).
Caution Once this command has been sent and completed, the drive’s power supply
must not be interrupted until the drive has completed the firmware upgrade.
The Buffer ID and Buffer Offset are ignored.
01010b This mode is used to write to the 4KB Echo Buffer.
The Buffer ID and Offset are ignored.
