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4.4.4 READ BUFFER (3C)
Bit
Byte
0
1
2
3
4
5
6
7
8
9
This command is used in combination with the WRITE BUFFER command to
diagnose the normalcy of the IDD's data buffer memory and the SAS interface.
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'E21FB0'.
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 in Table 4.128 can be selected.
"Mode" Bit
3
0
0
0
0
1
1
C141-C012
7
6
5
0
0
0
X'00' (Buffer ID)
Buffer Offset (MSB)
Buffer Offset
Buffer Offset (LSB)
Transfer Byte Length (MSB)
Transfer Byte Length
Transfer Byte Length (LSB)
0
0
0
Table 4.128 READ BUFFER transfer mode
2
1
0
0
0
0
Header + Data, without Address Specification
0
0
1
Header + Data, with Address Specification
0
1
0
Data Only, with Address Specification
0
1
1
Buffer Descriptor
0
1
0
Echo buffer
0
1
1
Echo buffer descriptor
4.4 Maintenance, Diagnostic Commands
4
3
2
X'3C'
0
Mode
0
0
0
Transfer Mode
1
0
0
0
4-193
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