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270 Fibre Channel Interface Manual, Rev. D
12.25 Read Buffer command
The Read Buffer command is used in conjunction with the Write Buffer command as a diagnostic function for
testing disc drive memory and the integrity of the FC-AL. This command will not alter the medium. Command
format is shown in Table 175.
Field definitions (listed alphabetically)
Allocation Length
The number of bytes available for returning read buffer command data.
Buffer ID
0
Control
See Control Bytes in Section 11.2.1.6.
Buffer Offset
0
Mode
The interpretation of data bits 0–2 is given in the following table and in paragraphs following the table.
Bit 2Bit 1Bit 0
000Read combined descriptor header and data (Section 12.25.1)
010Read data (Section 12.25.112.25.2)
011Read descriptor (Section 12.25.312.25.1)
Table 175: Read Buffer command (3Ch)
Bit
Byte
765 43210
000111100
100000
Mode
Reserved
2
Buffer ID
3 (MSB)
4 Buffer Offset
5 (LSB)
6 (MSB)
7 Allocation Length
8 (LSB)
9
Control
3Ch
Table
number
175
175
175
175
175