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Command Specifications
3 - 10 C141-E167
media. When this is the case, a subsequent request for command support data may be
successful.
c. CDB size
This field contains the number of bytes in the CDB for the operation code being queried, and the
size of the "CDB Usage Data" field in the return data.
d. CDB usage data
This field contains information about the CDB for the operation code being queried. The first
byte of the "CDB usage data" contains the operation code for the operation being queried. All
bytes except the first byte of the "CDB usage data" contains a usage map for bits in the CDB for
the operation code being queried.
The bits in the "Usage map" have a one-for-one correspondence to the CDB for the operation
code being queried. If the device server evaluates a bit as all or part of a field in the CDB for the
operation code being queried, the usage map contains a one in the corresponding bit position. If
the device server ignores or treats as reserved a bit in the CDB for the operation code being
queried, the usage map contains a zero in the corresponding bit position. The usage map bits for
a given CDB field all have the same value.
Thus, the CDB usage bit map for Inquiry command for a device server that implements
command support data but not vital product data is: 12h, 02h, FFh, 00h, 07h.
(7) VPD information
When "1" is specified in the "EVPD" bits of the CDB, the VPD information described below is
transferred to the INIT by this command. The INIT specifies the type of VPD information required
in the "Page code" field of the CDB. The type of VPD information supported by the IDD and its
page code number are as shown below.
Page Code Page (Hex) Function
00 Page code list of supported VPD information
80 Device serial number
C0 Operation mode
Furthermore, if page codes other than those shown above (VPD information that is not supported by
the IDD) are specified in the CDB, that command is terminated with a CHECK CONDITION status
(ILLEGAL REQUEST [=5] / Invalid field in CBD [=24-00]).
The format and contents of each type of VPD information are shown below.
a. Page code list
This VPD information reports the page code list of VPD information supported by the IDD. The
format of this VPD information is shown in Figure 3.3.