Maxtor ATLAS 10K III - Manual (Page 96)

SCSI Description
5-32 Maxtor Atlas 10K III
Table 5-38 Negotiated Rate Information Page-Field Descriptions
(KGNF &GHKPKVKQP
Transfer Period Factor Applicable values of this field are provided in Appendix B.
REQ / ACK Offset
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 out-
standing before a corresponding ACK assertion is received at the target:
Data transfer size is 2 bytes.
AIP
Asynchronous Information Protection. If = 1, drive supports AIP. If = 0,
device does not support AIP.
AIPD
Asynchronous Information Protection Generation Disabled. If = 1, AIP gen-
eration is disabled. If = 0, AIP generation is enabled.
AIPCE
Asynchronous Information Protection Checking Enabled. If = 1, AIP protec-
tion is enabled. If = 0, AIP protection is disabled.
TWE
Transfer Width Exponent. The transfer width is 2
n
bytes. If set to 0, 1 byte
is selected; if set to 1, 2 bytes are selected.
PARL
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.
FAIR
Fairness. When set = 1, the Fairness algorithm is enabled. When set = 0,
the algorithm is disabled.
SYNC
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.
QAS
(Note that the value of
this field must be 0 if the
value in PARL is 0)
Quick Arbritrate Support Enable. When = 0, indicates that QAS is to be dis-
abled 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 B.
DT
(Note that the value of
this field must be 0 if the
value in PARL is 0)
Double Transition Enable. When = 0, indicates that DT DATA is to be dis-
abled 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 B.
IU
(Note that the value of
this field must be 0 if the
value in PARL is 0)
Information Units Enable. When = 0, indicates that information unit trans-
fers will not be used when received from the initiator and that information
unit transfers are disabled when received from the target. When = 1, indi-
cates that information unit transfers will be used when received from the
initiator and that information unit transfers are enabled when received from
the target. See Appendix B.