ATN transmit setup time Min | Seagate Ultra 160, Ultra 320 specification

Table 7:	Transmit SCSI bus data and information phase DT timing values

				Timing values for negotiated transfer rate in nanoseconds
				unless otherwise noted [1]

									Fast-	Fast-
Timing description		Reference	Type	Fast-10	Fast-20	Fast-40		Fast-80	160	320


ATN transmit setup time		2.5.2	min	48.4	29.2	19.6		14.8	14	14

Flow control transmit hold time		2.5.15	min	38.4	19.2	9.6		4.8	14	14

Flow control transmit setup time		2.5.16	min	48.4	29.2	19.6		14.8	14	14

pCRC transmit hold time		2.5.19	min	38.4	19.2	9.6		4.8	N/A	N/A

pCRC transmit setup time		2.5.20	min	48.4	29.2	19.6		14.8	N/A	N/A

Transmit assertion period [2]		2.5.55	min	92	46	23		11.5	5.69	2.565

Transmit hold time [2] [3]		2.5.56	min	38.4	19.2	9.6		4.8	4.77	0.365

Transmit ISI compensation		2.5.57	max						1.0	0

Transmit negation period [2]		2.5.58	min	92	46	23		11.5	5.69	2.565

Transmit REQ(ACK) period toler-		2.5.60	max	0.6	0.6	0.6		0.6	0.06	0.06
ance

Transmit REQ assertion period		2.5.61	min	97.5	54	35.5		24	N/A	N/A
with P_CRCA transitioning

Transmit setup time [2] [3]		2.5.59	min	38.4	19.2	9.6		4.8	1.48	-2.76

Transmitter skew		2.5.63	max	N/A	N/A	N/A		N/A	± 0.75	± 0.75

Transmitter time asymmetry		2.5.64	max	N/A	N/A	N/A		N/A	± 0.25	± 0.25

[1]SCSI bus timing values specified by the maximum transfer rate for the given range shall apply even if a slower transfer rate within the given range is negotiated.

[2]See Section 2.6 for measurement points for the timing specifications.

[3]See Section 9.6 in the ANSI SCSI Parallel Interface-5 (SPI-5) specification for examples of how to calcu- late setup and hold timing.

Note. Fast-160 and fast 320 SCSI devices shall not change timing parameters between training or reset events.

Parallel SCSI Interface Product Manual, Rev. A )

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Seagate Ultra 160, Ultra 320 manual ATN transmit setup time Min

Contents

Parallel Scsi Interface Page Parallel Scsi Interface Page Revision Date Writer/Engineer Revision status summary sheet Parallel Scsi Interface Product Manual, Rev. a Table of Contents Parallel Scsi Interface Product Manual, Rev. a Wide transfer Logical characteristics Message system specification Scsi commands Miscellaneous Scsi bus characteristicsSPI information units Drive features List of Figures Xii Parallel Scsi Interface Product Manual, Rev. a Interface requirements How to use this interface manual Scope of Scsi standards Applicable standards General interface description Scsi client-server model GlossaryPage Page Page Page Page Page Keywords Summary of Scsi messages Physical interface characteristicsMessage Name Hex Code Number Scsi bus Priority Scsi IDs and associated Scsi bus arbitration priorities Scsi bus signals overview Scsi target usage of Pcrca Pcrc signal usage requirements Signal values Signal statesSE signals LVD signals Voltage and current definitions OR-tied signals Signal sources Signal sourcesData bit P cable Data bit a cable I/O DB15-8 Scsi bus phase DB7-0 Scsi bus control timing values in nanoseconds Scsi bus timingTiming Reference Type Value ns Unless Timing description Timing values for negotiated transfer rate Scsi bus data and information phase ST timing valuesNanoseconds unless otherwise noted Timing values for negotiated transfer rate in nanosecondsPage ATN transmit setup time Min Receive Scsi bus data and information phase DT timing values Fast-160 Fast-320 Comments Total transmitter error budget Receiver errorsInterconnect and system margin ATN receive setup time ATN transmit setup timeCrosstalk time shift ISI of data Bus free delay Bus clear delayBus set delay Bus settle delay Flow control transmit setup time Flow control receive setup timePCRC receive setup time PCRC transmit setup time Physical disconnection delay Data release delayPower on to selection QAS arbitration delay Receive setup time Receive internal setup timeReceive internal hold time Receive negation period Reset hold time Reset delayReset to selection Residual skew error Skew correction range System deskew delayStrobe offset tolerance System noise at launch Measurement points LVD measurement points Clocking methods for data transfers ST latching data vs. DT latching data DT synchronous transfer example Paced transfer on a Scsi bus Asynchronous transfers Data transfer modesSynchronous transfers Paced transfers DT Data phase parallel transfers ST Data phase parallel transfersData group transfers Information unit transfers Negotiation algorithm Negotiation Negotiable fields When to negotiateNegotiable fields and effects of successful negotiation Negotiation message pair Field name Response shall be Responding message requirementsField Name Message Numerically Transfer agreements Transfer period factor relationships Transfer period factorValue Description Message Transfer rate Synchronous Transfer width exponent 12.6 REQ/ACK offset Protocol options bits Protocol optionsIureq Sdtr negotiation PPR negotiation setting Iureq to one Bus phases resulting from Iureq changesPPR negotiation setting Iureq to zero PPR negotiation keeping Iureq set to zero Rdstrm WrflowRTI Retain Training Information Pcompen Transfer Negotiable field combinationsTransfer Period Negotiation message sequences Message restrictions Parallel Scsi Interface Product Manual, Rev. a BUS Free phase Scsi bus phases overviewUnexpected and expected bus free phases Arbitration and QAS overview Expected bus free phases Normal Arbitration phase QAS protocol QAS phase overview Selection phase Information unit transfers enabled Information unit transfers disabledSelection overview Selection using attention condition timeout procedure Reselection phase overview Reselection phasePhysical reconnection Scsi bus fairness Physical reconnection timeout procedure Information transfer phases Information transfer phasesSignal Phase Direction of transfer Comment Synchronous transfer Asynchronous transferST synchronous data transfer Information unit transfer DT synchronous transferPage Data group data field transfer Page Page Page Paced transfer training pattern Paced transfer Start of section a DT Data in phase training patternStart of section B Start of section C DT Data OUT phase training pattern 3.2 P1 data valid/invalid state transitions Starting pacing transfers with no training pattern Starting pacing transfers at end of training pattern Paced information unit transfer Ending pacing transfers Wide transfer Deskewing Data phase Command phase Message phase Status phase Message in phase exception condition handling Signal restrictions between phasesMessage OUT phase Message OUT phase exception condition handling Scsi bus phase sequences overview Scsi bus phase sequences Hard reset or protocol error Reselection Selection Arbitration DT Data Message OUT Parity checking rules for Selection and Reselection phases ST data bus protection using parityData bus protection Data bus protection overview Order of bytes in the CRC field Error detection capabilities Message formats General message protocols and formats One-byte messages Message formatTwo-byte messages Extended messages Extended Message Codes Message categoriesLink Control Messages Link Control message codes Key Identify DisconnectIdentify message format Bit Byte Ignore Wide Residue message format Ignore Wide ResidueIgnore field definition Invalid data bits Linked Command Complete Initiator Detected ErrorMessage Parity Error Message Reject Modify Bidirectional Data Pointer Modify Data Pointer message format No Operation Modify Bidirectional Data Pointer message format Parallel Protocol Request message format Parallel Protocol Request Value 00h 01h-FEh FFh Description Timing values Valid protocol options bit combinations Use ST Data in and ST Data OUT phases to transfer dataUse QAS for arbitration Parallel Protocol Request messages implied agreement QAS Request Restore PointersSave Data Pointers Synchronous Data Transfer Request message format Synchronous Data Transfer Request Sdtr messages implied agreements Initiator initiated Sdtr negotiation Target initiated Sdtr negotiationTask Complete Wide Data Transfer Request message format Wide Data Transfer Request Target initiated Wdtr negotiation Wdtr message implied agreementResponding Scsi device Wdtr response Implied agreement Task attribute message overview and codes Task attribute messages ACA Auto Contingent Allegiance Task attribute message codesACA message format Ordered Head of Queue Task management message codes Task management message codes Task management messagesAbort Task 0Eh Target Reset Logical Unit ResetAbort Task SET Clear ACA Miscellaneous Scsi bus characteristics Hard reset Bus reset condition Asynchronous condition recovery Reset events Saved pointers Active pointers Asynchronous event notification Command processing considerations and exception conditionsIncorrect initiator connection Unexpected Reselection phase Information unit transfer logical operations SPI information unitsPage Parallel Scsi Interface Product Manual, Rev. a 115 116 Parallel Scsi Interface Product Manual, Rev. a Parallel Scsi Interface Product Manual, Rev. a 117 SPI information units SPI command information unit SPI command information unit Bit Byte Task Management flags Codes Description Task Attribute Codes Description SPI LQ information unit Bit Byte SPI LQ information unit Bidi Direction Codes Type Description SPI LQ information unit typeF0H FFh AllPage SPI data stream information unit SPI data information unitSPI data information unit Bit Byte SPI status data stream information unit Bit Byte SPI status information unit Bit Byte SPI status information unitReserved Reserved for FCP Packetized Failures field Bit Byte SPI command information unit fields invalidPacketized Failures code Codes Description Task management function not supportedPage 130 Parallel Scsi Interface Product Manual, Rev. a Command Descriptor Block CDB Command implementation requirementsReserved Page Fixed and variable length Command Descriptor Block formats Typical CDB for 16-byte commands Bit Byte Typical CDB for 12-byte commands Bit ByteAdditional CDB Data if required Additional CDB Length n-7 Typical variable length CDB Bit Byte Operation Code 7FhPage Naca a Control field Bit Byte LastLink b Status Status precedence Single command example Command examples Disconnect example Disconnect example Auto Contingent Allegiance or Contingent Allegiance Timing examples Clearing an Auto Contingent Allegiance condition Overlapped commands Sense data Incorrect logical unit selectionAsynchronous Event Reporting Autosense Unit Attention condition Logical unit reset Target hard resetQueued tasks formerly queued I/O processes Untagged task queuing Tagged task queuing Programmable operating definition Parameter rounding Incorrect initiator connection S.M.A.R.T. system Default self-testSelf-test operations Short and extended self-tests Background mode Foreground modeSelf-test modes Device type a Command Reference All device types Exception commands for background self-tests Error detection for asynchronous information phases Self-test mode summaryProtection code Word Location Signal Meaning Covered signalsPage Code description Error detection propertiesProtection code usage Protection code transmission Error handlingEnabling protection code checking Disabling protection code checking Case 1-Power off during removal or insertion SPI-3 to SCSI-2 terminology mapping SPI-3 to SCSI-2 terminology mappingSPI-3 equivalent term SCSI-2 term Index Code value reserved Disconnect privilege 148 domain 5, 9 dormant Initiator 3, 6, 14, 131, 140 faulted Multidrop 7 multimode Page Scsi Page Wdtr 40 170 Parallel Scsi Interface Product Manual, Rev. a Page Seagate Technology LLC