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21020285 D User’s Guide
Chapter 6 Target Mode Pass-through Commands
Page 6 - 6 Command Descriptor Block Group Codes
Command
Descriptor
Block Group
Codes
The RF3880 will decode the group number of a SCSI command, and only
receive the number of command bytes specified by that group code. If more
information is required by a vendor-specific command, the additional
information must be sent in the Data phase.
The RF3880 makes the following assumptions about the length of a Command
Descriptor Block received from the Host:
Note
* During Target Mode
operations, the Tag bit in
the Unit Option (08H)
command’s Unit Flag
byte controls whether
Group 2’s 6- or 10-byte
commands are accepted.
This applies to the
Extended Unit Options
(18H) command as well,
see Chapter 7 for further
details.
Group OP Codes Description
0 00 - 1F 6-byte commands
1 20 - 3F 10-byte commands
2* 40 - 5F
6-bytes (no SCSI-2 devices configured)
10 bytes (SCSI-2 devices configured)
3-4 60 - 9F 6-byte commands (reserved)
5 A0 - BF 12-byte commands
6 C0 - DF 6-byte commands (vendor specific)
7 E0 - FF 10-byte commands (vendor specific)
Table 43: SCSI Command Descriptor Block Groups