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SCSI Interface Product Manual, Rev. J
Table 50:
ANSI-approved version
Code Description
0h
The device does not claim conformance to any standard.
1h
Obsolete (formerly SCSI-1).
2h
The device complies to ANSI X3.131-1994 (SCSI-2).
3h
The device complies to ANSI X3.301-1997.
4h
The device complies to ANSI T10/1236.
5h-7h Reserved.
[3]
An Asynchronous Event Reporting Capability (AERC) bit of zero indicates that the drive does not support
the asynchronous event reporting capability.
[4]
A Terminate Task (TrmTsk) bit of zero indicates that the drive does not support the Terminate Task man-
agement function.
[5]
The Normal ACA Supported (NormACA) bit of one indicates that the device server supports setting the
NACA bit to one in the Control Byte of the CDB (as defined in ANSI document SCSI-3 Architectural
Model-2, T10/1157). A NormACA bit of zero indicates that the device server does not support setting the
NACA bit to one (see paragraph 4.2.6, "Control field."
[6]
A Hierarchical Support (HiSupport) bit of zero indicates the target does not use the hierarchical address-
ing model to assign LUNs to logical units. A HiSupport bit of one indicates the target uses the hierarchical
addressing model to assign LUNs to logical units. When the HiSupport bit is one, the device server shall
support the Report LUNs command (see Section 5.33).
[7]
A Response Data Format value of zero indicates the Inquiry data format is as specified in the ANSI
SCSI-1 standard. A response data format value of one indicates compatibility with some products that
were designed prior to the development of the ANSI SCSI Controller Command Set-2 standard. A
response data format value of two indicates that the data shall be in the format specified in the SCSI-2
standard. Response data format values greater than two are reserved.
[8]
The Additional Length field shall specify the length in bytes of the parameters. If the allocation length of
the command descriptor block is too small to transfer all of the parameters, the additional length is not
adjusted to reflect the truncation.
[9]
An SCC Supported (SCCS) bit of one indicates that the device contains an embedded storage array con-
troller component. See SCC-2 (SCSI-3 Controller Command Set-2, T10/1225-D) for details about storage
array controller devices. An SCCS bit of zero indicates that the device does not contain an embedded
storage array controller component.
[10] The Basic Queuing (BQue) bit shall be zero if the CmdQue (see note [24]) bit is one. When the CmdQue
bit is zero, the BQue bit shall have the following meaning. A BQue bit of zero indicates that the device
does not support tagged tasks (command queuing) for this logical unit. A value of one indicates that the
device supports, for this logical unit, the basic task management model defined by ANSI document SCSI-
3 Architectural Model-2, T10/1157.
[11] An Enclosure Services (EncServ) bit of one indicates that the device contains an embedded enclosure
services component. See ANSI Document SCSI-3 Enclosure Services Command Set, NCITS 305-199X,
T10/1212-D for details about enclosure services, including a device model for an embedded enclosure
services device. An EncServ bit of zero indicates that the device does not contain an embedded enclo-
sure services component.
[12] Vendor Specific. Dual port A-B on some drives.
[13] A Multi Port (MultiP) bit of one shall indicate that this is a multi-port (2 or more ports) device and conforms
to the SCSI-3 multi-port device requirements found in the applicable standards. A value of zero indicates
that this device has a single port and does not implement the multi-port requirements.
[14] A Medium Changer (MChngr) bit of one indicates that the device is embedded within or attached to a
medium transport element. See SMC (T10/999-D) for details about medium changers, including a device
model for an attached medium changer device. The MChngr bit is valid only when the RMB bit is equal to
one. An MChngr bit of zero indicates that the device is not embedded within or attached to a medium
transport element.
[15] An ACKQ/REQQ (AckReqQ) bit of one indicates that the target supports a request and acknowledge data
transfer handshake on the secondary bus.
89
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