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C141-E124-01EN3 - 118
3.4.3 WRITE BUFFER (3B)
Bit
Byte
76543210
0X‘3B’
1 LUN 0 Mode
2 Buffer Address (MSB)
3 Buffer Address
4 Buffer Address
5 Buffer Address (LSB)
6 Transfer Byte Length (MSB)
7 Transfer Byte Length
8 Transfer Byte Length (LSB)
9 000000FlagLink
This command is used in combination with the READ BUFFER command to diagnose the
normality of the IDD’s data buffer memory or the SCSI bus, or to download microcode to the IDD.
The IDD stores data transferred from the INIT in accordance with the specifications in this
command's CDB to in the data buffer in the IDD. The IDD have 7,680 K (7,864,320) byte data
buffers. This command, using buffer addresses with a range of X'000000' to X'77FFFF', must
specify data storage positions in 1-byte units, and with 4-byte units addresses. The INIT can know
the IDD's buffer configuration and the units which addresses can be specified in by issuing the
READ BUFFER command.
The functions of this command and the format of data transferred from the INIT are specified in
the “Mode” field in byte 1 of the CDB and any of the transfer modes shown below can be selected.