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Seagate Ultra 160, Ultra 320 manual Parallel Scsi Interface Product Manual, Rev. a 117

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DT DATA IN				DT DATA OUT
(from SPI STATUS RESELECTION				(from SPI COMMAND
or SPI DATA)				or SPI DATA)

DT DATA IN

SPI L_Q

[1](always Targ to Init) (logical reconnect)

(data pointer restored)

DT DATA IN		Attention
or		Condition
or		Condition
DT DATA OUT

[2]SPI DATA

[4]

(data pointer saved)

(logical disconnect)

DT DATA IN

MESSAGE OUT

to SPI L_Q/STATUS [3]

BUS FREE	MESSAGE IN
(physical
disconnect)

[1]See Table 49 for the format of the SPI L_Q information unit.

[2]See Table 53 for the format of the SPI Data information unit.

[3]See Figure 18.

Figure 17. SPI information unit sequence during data stream type transfers

Parallel SCSI Interface Product Manual, Rev. A

117

Image 131

Seagate Ultra 160, Ultra 320 manual Parallel Scsi Interface Product Manual, Rev. a 117

Contents

Parallel Scsi Interface Page Parallel Scsi Interface Page Revision Date Writer/Engineer Revision status summary sheetParallel Scsi Interface Product Manual, Rev. a Table of Contents Parallel Scsi Interface Product Manual, Rev. a Wide transfer Logical characteristicsMessage system specification SPI information units Miscellaneous Scsi bus characteristicsScsi commands Drive features List of Figures Xii Parallel Scsi Interface Product Manual, Rev. a Interface requirements How to use this interface manualScope of Scsi standards Applicable standards General interface descriptionScsi client-server model GlossaryPage Page Page Page Page Page Keywords Message Name Hex Code Number Physical interface characteristicsSummary of Scsi messages Scsi bus Priority Scsi IDs and associated Scsi bus arbitration prioritiesScsi bus signals overview Scsi target usage of Pcrca Pcrc signal usage requirementsLVD signals Signal statesSignal values SE signalsVoltage and current definitions OR-tied signalsDB7-0 Signal sourcesSignal sources Data bit P cable Data bit a cable I/O DB15-8 Scsi bus phaseReference Type Value ns Unless Timing description Scsi bus timingScsi bus control timing values in nanoseconds TimingTiming values for negotiated transfer rate in nanoseconds Scsi bus data and information phase ST timing valuesTiming values for negotiated transfer rate Nanoseconds unless otherwise notedPage ATN transmit setup time Min Receive Scsi bus data and information phase DT timing values Interconnect and system margin Total transmitter error budget Receiver errorsFast-160 Fast-320 Comments ISI of data ATN transmit setup timeATN receive setup time Crosstalk time shiftBus settle delay Bus clear delayBus free delay Bus set delayPCRC transmit setup time Flow control receive setup timeFlow control transmit setup time PCRC receive setup timeQAS arbitration delay Data release delayPhysical disconnection delay Power on to selectionReceive negation period Receive internal setup timeReceive setup time Receive internal hold timeResidual skew error Reset delayReset hold time Reset to selectionSystem noise at launch System deskew delaySkew correction range Strobe offset toleranceMeasurement points LVD measurement points Clocking methods for data transfersST latching data vs. DT latching data DT synchronous transfer example Paced transfer on a Scsi busPaced transfers Data transfer modesAsynchronous transfers Synchronous transfersInformation unit transfers ST Data phase parallel transfersDT Data phase parallel transfers Data group transfersNegotiation algorithm NegotiationNegotiation message pair Field name When to negotiateNegotiable fields Negotiable fields and effects of successful negotiationField Name Message Numerically Responding message requirementsResponse shall be Transfer agreements Synchronous Transfer period factorTransfer period factor relationships Value Description Message Transfer rateTransfer width exponent 12.6 REQ/ACK offsetIureq Protocol optionsProtocol options bits PPR negotiation keeping Iureq set to zero Bus phases resulting from Iureq changesSdtr negotiation PPR negotiation setting Iureq to one PPR negotiation setting Iureq to zeroPcompen WrflowRdstrm RTI Retain Training InformationTransfer Period Negotiable field combinationsTransfer Negotiation message sequences Message restrictionsParallel Scsi Interface Product Manual, Rev. a Unexpected and expected bus free phases Scsi bus phases overviewBUS Free phase Arbitration and QAS overview Expected bus free phasesNormal Arbitration phase QAS protocol QAS phase overviewSelection phase Selection overview Information unit transfers disabledInformation unit transfers enabled Selection using attention condition timeout procedure Physical reconnection Reselection phaseReselection phase overview Scsi bus fairness Physical reconnection timeout procedureSignal Phase Direction of transfer Comment Information transfer phasesInformation transfer phases ST synchronous data transfer Asynchronous transferSynchronous transfer Information unit transfer DT synchronous transferPage Data group data field transfer Page Page Page Paced transfer training pattern Paced transferStart of section B DT Data in phase training patternStart of section a Start of section C DT Data OUT phase training pattern3.2 P1 data valid/invalid state transitions Starting pacing transfers with no training pattern Starting pacing transfers at end of training patternPaced information unit transfer Ending pacing transfersWide transfer DeskewingData phase Command phaseMessage phase Status phaseMessage OUT phase exception condition handling Signal restrictions between phasesMessage in phase exception condition handling Message OUT phaseScsi bus phase sequences overview Scsi bus phase sequencesHard reset or protocol error Reselection Selection Arbitration DT Data Message OUT Data bus protection overview ST data bus protection using parityParity checking rules for Selection and Reselection phases Data bus protectionOrder of bytes in the CRC field Error detection capabilitiesMessage formats General message protocols and formatsExtended messages Message formatOne-byte messages Two-byte messagesLink Control Messages Link Control message codes Message categoriesExtended Message Codes Key Bit Byte DisconnectIdentify Identify message formatInvalid data bits Ignore Wide ResidueIgnore Wide Residue message format Ignore field definitionMessage Reject Initiator Detected ErrorLinked Command Complete Message Parity ErrorModify Bidirectional Data Pointer Modify Data Pointer message formatNo Operation Modify Bidirectional Data Pointer message formatParallel Protocol Request message format Parallel Protocol RequestValue 00h 01h-FEh FFh Description Timing values Use QAS for arbitration Use ST Data in and ST Data OUT phases to transfer dataValid protocol options bit combinations Parallel Protocol Request messages implied agreement Save Data Pointers Restore PointersQAS Request Synchronous Data Transfer Request message format Synchronous Data Transfer RequestSdtr messages implied agreements Task Complete Target initiated Sdtr negotiationInitiator initiated Sdtr negotiation Wide Data Transfer Request message format Wide Data Transfer RequestResponding Scsi device Wdtr response Implied agreement Wdtr message implied agreementTarget initiated Wdtr negotiation Task attribute message overview and codes Task attribute messagesACA message format Task attribute message codesACA Auto Contingent Allegiance Ordered Head of Queue0Eh Task management messagesTask management message codes Task management message codes Abort TaskClear ACA Logical Unit ResetTarget Reset Abort Task SETMiscellaneous Scsi bus characteristics Hard reset Bus reset conditionAsynchronous condition recovery Reset eventsSaved pointers Active pointersIncorrect initiator connection Command processing considerations and exception conditionsAsynchronous event notification 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 unitSPI command information unit Bit Byte Task Management flags Codes Description Task Attribute Codes DescriptionSPI LQ information unit Bit Byte SPI LQ information unitBidi Direction FFh All SPI LQ information unit typeCodes Type Description F0HPage SPI data information unit Bit Byte SPI data information unitSPI data stream information unit SPI status data stream information unit Bit Byte Reserved Reserved for FCP SPI status information unitSPI status information unit Bit Byte Task management function not supported SPI command information unit fields invalidPacketized Failures field Bit Byte Packetized Failures code Codes DescriptionPage 130 Parallel Scsi Interface Product Manual, Rev. a Reserved Command implementation requirementsCommand Descriptor Block CDB Page Fixed and variable length Command Descriptor Block formats Additional CDB Data if required Typical CDB for 12-byte commands Bit ByteTypical CDB for 16-byte commands Bit Byte Additional CDB Length n-7 Typical variable length CDB Bit Byte Operation Code 7FhPage Link b Control field Bit Byte LastNaca a Status Status precedence Single command example Command examplesDisconnect example Disconnect exampleAuto Contingent Allegiance or Contingent Allegiance Timing examplesClearing an Auto Contingent Allegiance condition Overlapped commandsAsynchronous Event Reporting Incorrect logical unit selectionSense data Autosense Unit Attention condition Untagged task queuing Target hard resetLogical unit reset Queued tasks formerly queued I/O processesTagged task queuing Programmable operating definition Parameter roundingIncorrect initiator connection Short and extended self-tests Default self-testS.M.A.R.T. system Self-test operationsSelf-test modes Foreground modeBackground mode Device type a Command Reference All device types Exception commands for background self-testsProtection code Self-test mode summaryError detection for asynchronous information phases Word Location Signal Meaning Covered signalsPage Protection code usage Error detection propertiesCode description Disabling protection code checking Error handlingProtection code transmission Enabling protection code checkingCase 1-Power off during removal or insertion SPI-3 equivalent term SCSI-2 term SPI-3 to SCSI-2 terminology mappingSPI-3 to SCSI-2 terminology mapping 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