Fujitsu MAN3184 Manuel D’Utilisation
C141-E124-01EN
3 - 124
3.4.4
READ BUFFER (3C)
Bit
Byte
Byte
7
6
5
4
3
2
1
0
0
X‘3C’
1
LUN
0
Mode
2
X‘00’ (Buffer ID)
3
Buffer Offset (MSB)
4
Buffer Offset
5
Buffer Offset (LSB)
6
Transfer Byte Length (MSB)
7
Transfer Byte Length
8
Transfer Byte Length (LSB)
9
0
0
0
0
0
0
Flag
Link
This command is used in combination with the WRITE BUFFER command to diagnose the
normalcy of the IDD’s data buffer memory and the SCSI bus.
normalcy of the IDD’s data buffer memory and the SCSI bus.
The IDD have a 7680 K byte size data buffer.. In this command, each data byte position in the
data buffer must be specified in 4-byte units using buffer addresses within the range X'000000' to
X'77FFFF'.
data buffer must be specified in 4-byte units using buffer addresses within the range X'000000' to
X'77FFFF'.
The functions of this command and the contents of the data transferred to the INIT are specified by
the “Mode” field in the CDB and one of the transfer modes shown below can be selected.
the “Mode” field in the CDB and one of the transfer modes shown below can be selected.
“Mode” Bit
3
2
1
0
Transfer Mode
0
0
0
0
Header + Data, without Address Specification
0
0
0
1
Header + Data, with Address Specification
0
0
1
0
Data Only, with Address Specification
0
0
1
1
Buffer Descriptor
1
0
1
0
Echo buffer
1
0
1
1
Echo buffer descriptor