Maxtor 10K III manual Negotiated Rate Information Page-Field Descriptions

SCSI Description

		Negotiated Rate Information Page-Field Descriptions
	Table	5-38
Transfer (KGNFPeriod￿Factor		Applicable values of this field are&GHKPKVKQPprovided in Appendix B.
		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
REQ / ACK Offset		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 2n bytes. If set to 0, 1 byte
		is selected; if set to 1, 2 bytes are selected.
		Parallel Protocol. When = 1, this field indicates the negotiation occurred
PARL		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.
		Synchronous Mode. When set = 1, the data transfer bus is operating in
SYNC		synchronous mode. When set = 0, the data transfer bus is operating in
		asynchronous mode.
QAS		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
(Note that the value of
		from target. When = 1, indicates that QAS is to be enabled when received
this field must be 0 if the
		from initiator and that QAS is enabled when received from target. See
value in PARL is 0)
		Appendix B.
DT		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
(Note that the value of
		when received from target. When = 1, indicates that DT DATA phases are
this field must be 0 if the
		to be enabled when received from initiator and that DT DATA phases are
value in PARL is 0)
		enabled when received from target. See Appendix B.
		Information Units Enable. When = 0, indicates that information unit trans-
IU		fers will not be used when received from the initiator and that information
(Note that the value of		unit transfers are disabled when received from the target. When = 1, indi-
this field must be 0 if the		cates that information unit transfers will be used when received from the
value in PARL is 0)		initiator and that information unit transfers are enabled when received from
		the target. See Appendix B.

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