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168 Fibre Channel Interface Manual, Rev. D
12.6 Inquiry command
The Inquiry command requests that information regarding parameters of the disc drive be sent to the initiator.
The Enable Vital Product Data (EVPD) option allows the initiator to request additional information about the
disc drive. See Section 12.6.1.
Several Inquiry commands may be sent to request the vital product data pages instead of the standard data
shown in Table 105 on page 170.
Field definitions (listed alphabetically)
Allocation Length
The allocation length specifies the number of bytes the initiator has allocated for returned data. The disc drive terminates
the Data In phase when allocation length bytes have been transferred or when all available data have been transferred to
the initiator, whichever is less.
Control
See Control Bytes in Section 11.2.1.6.
EVPD (Enable Vital Product Data)
0 The disc drive returns the standard Inquiry data.
1 The disc drive returns the vital product data specified by the page code field.
Page Code
The Page Code field specifies the page of vital product data information that the disc drive returns.
If the EVPD bit = 0 and the page code field is not 0, the disc drive returns Check Condition status with the sense key set to
Illegal Request and an additional sense code of Invalid Field In CDB.
Table 104: Inquiry command (12h)
Bit
Byte
76543210
000010010
10000000EVPD
Reserved
2
Page Code
300000000
4
Allocation Length (in bytes)
5
Control
12h
Table
number
104
104
104
104