Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB Product Manual page 113

SCSI Description
INQUIRY Command (12h) (continued)
Table 5–17A Negotiated Rate Information Page — Field Descriptions
Field
Transfer Period Factor
REQ / ACK Offset
AIP
AIPD
AIPCE
TWE
PARL
FAIR
SYNC
QAS
(Note that the value of this
field must be 0 if the value in
PARL is 0)
DT
(Note that the value of this
field must be 0 if the value in
PARL is 0)
IU
(Note that the value of this
field must be 0 if the value in
PARL is 0)
5–46 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
Definition
Applicable values of this field are provided in Appendix C.
This is the negotiated value of Req / Ack offset between the initiator and
the target. For Single Transition (ST) data transfers, the REQ/ACK Offset is
the maximum number of REQ assertions allowed to be outstanding
before a corresponding ACK assertion is received at the target: Data
transfer size may be 1 or 2 bytes. For Double Transition (DT) data
transfers, the REQ/ACK Offset is the maximum number of REQ assertions
allowed to be outstanding before a corresponding ACK assertion is
received at the target: Data transfer size is 2 bytes.
Asynchronous Information Protection. If = 1, drive supports AIP. If = 0,
device does not support AIP.
Asynchronous Information Protection Generation Disabled. If = 1, AIP
generation is disabled. If = 0, AIP generation is enabled.
Asynchronous Information Protection Checking Enabled. If = 1, AIP
protection is enabled. If = 0, AIP protection is disabled.
Transfer Width Exponent. The transfer width is 2
is selected; if set to 1, 2 bytes are selected.
Parallel Protocol. When = 1, this field indicates the negotiation occurred
with a Parallel Protocol message format. When = 0, this field indicates
the negotiation occurred with a Synchronous Data Request message
format.
Fairness. When set = 1, the Fairness algorithm is enabled. When set = 0,
the algorithm is disabled.
Synchronous Mode. When set = 1, the data transfer bus is operating in
synchronous mode. When set = 0, the data transfer bus is operating in
asynchronous mode.
Quick Arbritrate Support Enable. When = 0, indicates that QAS is to be
disabled when received from initiator and that QAS is disabled when
received from target. When = 1, indicates that QAS is to be enabled
when received from initiator and that QAS is enabled when received from
target. See Appendix C.
Double Transition Enable. When = 0, indicates that DT DATA is to be
disabled when received from initiator and that DT DATA phases are
disabled when received from target. When = 1, indicates that DT DATA
phases are to be enabled when received from initiator and that DT DATA
phases are enabled when received from target. See Appendix C.
Information Units Enable. When = 0, indicates that information unit
transfers shall not be used when received from the initiator and that
information unit transfers are disabled when received from the target.
When = 1, indicates that information unit transfers shall be used when
received from the initiator and that information unit transfers are enabled
when received from the target. See Appendix C.
n bytes. If set to 0, 1 byte