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Command Specifications
(6) Mode = 1, 0, 1, 1 : Echo buffer descriptor
In this mode, a maximum of four bytes of READ BUFFER descriptor information
is returned. The device server shall return the descriptor information for the echo
buffer. The "Buffer Offset" field is reserved in this mode. The allocation length
should be set to four or greater. The device server shall transfer the lesser of the
allocation length or four bytes of READ BUFFER descriptor. The READ
BUFFER descriptor is defined as shown in Table 4.125.
Table 4.125 READ BUFFER command: echo buffer descriptor
Bit
Byte
0
1
2
3
The IDD return one in EBOS field, and the IDD verifies that echo buffer data
from each initiator is the same as that previously written by the same initiator.
The "Buffer Capacity" field returns the size of the echo buffer X'01FC' in bytes
aligned to a four-byte boundary.
4.4.5 READ LONG (3E)
Bit
Byte
0
1
2
3
4
5
6
7
8
9
4-190
7
6
5
Reserved
Reserved
Echo Buffer Capacity (LSB)
7
6
5
0
0
0
Logical Block Address (MSB)
Logical Block Address
Logical Block Address
Logical Block Address (LSB)
0
0
0
Transfer Byte Length (MSB)
Transfer Byte Length (LSB)
0
0
0
4
3
2
Reserved
Echo Buffer Capacity (MSB)
4
3
2
X'3E'
0
0
0
CORRCT
0
0
0
0
0
0
1
0
EBOS
1
0
0
0
0
0
0
C141-C009
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