FUJITSU MCM3064AP - Manual (Page 152)

Host Interface
4-82 C156-E227-01EN
4.6.26 WRITE BUFFER command
Table 4.115 WRITE BUFFER command
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (3Bh)
1 Logical Unit Number Reserved Mode
2 Reserved Reserved TNFY Reserved Code-ID
3-5 Buffer Offset
6-8 Allocation Length
9-11 Reserved
The WRITE BUFFER command downloads the firmware to the flash ROM.
Mode must be set to 5. Otherwise, the command responds with Check Condition.
If TNFY is 0 and Allocation Length is not 0, the command transfers data to be
written on the flash ROM to the data buffer. The WRITE BUFFER command
checks for validity of transfer data, then writes it on the flash ROM.
If TNFY is 0 and Allocation Length is 0, the command checks propriety of data on
the data buffer and writes on the flash ROM.
When TNFY is 1, the command transfers data to be written on the flash ROM into
the data buffer.
Code-ID indicates the type of code to be downloaded.
Allocation Length indicates the length of data to be transferred in bytes.
Buffer Offset indicates the offset value for data to be transferred.
If write operation to the flash ROM ends abnormally, the command responds with
Check Condition.
If power failure or interface cable disconnection occurs during
downloading, flash ROM data may not be assured.
Valid download data is Fujitsu distributed data only.