SPI information units | Seagate Ultra 320, Ultra 160 specification

RESELECTION

DT DATA OUT (from SPI DATA

or SPI COMMAND)

DT DATA IN

(from SPI DATA)

DT DATA IN

[1]SPI L_Q

		(always Targ to Init)
		(always Targ to Init)
		(logical reconnect)

Data	(data pointer
	restored)
	restored)
Length						Attention
= 0						Condition

[2]SPI STATUS

(always Targ to Init)

(logical disconnect)

BUS FREE	DT DATA IN	MESSAGE	MESSAGE
(physical	(to SPI L_Q/DATA [3])	IN	OUT
disconnect)		(to QAS)

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

[2]See Table 54 for the format of the SPI Status information unit.

[3]See Figure 16.

Figure 18. SPI information unit sequence during status transfers

6.2SPI information units

6.2.1SPI command information unit

The SPI command information unit (see Table 46) transfers CDBs, task attributes, and task management requests to be performed by a device server.

a SCSI initiator port shall consider a BUS FREE phase after the transfer of a SPI command information unit to be equivalent to receiving a DISCONNECT message.

If a SCSI target port does not have the resources to accept a SPI command information unit and the Task Man- agement Flags field equals 00h the target shall transfer all the bytes of the current SPI command information unit but need not hold the transmitted information. After transferring all the SPI command information unit bytes the target shall change to a DT DATA IN phase and transmit a SPI status information unit with the status defined in the SCSI Architecture Model-4 standard (SAM-4) for this condition. If the initiator has more com- mands to send the target, the initiator shall wait at least until the next selection before those remaining com- mands may be sent.

118	Parallel SCSI Interface Product Manual, Rev. A

Image 132

Seagate Ultra 320, Ultra 160 manual SPI information units, SPI command information unit

Contents

Parallel Scsi Interface Page Parallel Scsi Interface Page Revision status summary sheet Revision Date Writer/Engineer Parallel Scsi Interface Product Manual, Rev. a Table of Contents Parallel Scsi Interface Product Manual, Rev. a Logical characteristics Wide transfer Message system specification Miscellaneous Scsi bus characteristics Scsi commandsSPI information units Drive features List of Figures Xii Parallel Scsi Interface Product Manual, Rev. a How to use this interface manual Interface requirements Scope of Scsi standards General interface description Applicable standards Glossary Scsi client-server modelPage Page Page Page Page Page Keywords Physical interface characteristics Summary of Scsi messagesMessage Name Hex Code Number Scsi bus Scsi IDs and associated Scsi bus arbitration priorities Priority Scsi bus signals overview Pcrc signal usage requirements Scsi target usage of Pcrca Signal states Signal valuesSE signals LVD signals OR-tied signals Voltage and current definitions Signal sources Signal sourcesData bit P cable Data bit a cable I/O DB15-8 Scsi bus phase DB7-0 Scsi bus timing Scsi bus control timing values in nanosecondsTiming Reference Type Value ns Unless Timing description Scsi bus data and information phase ST timing values Timing values for negotiated transfer rateNanoseconds 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 Total transmitter error budget Receiver errors Fast-160 Fast-320 CommentsInterconnect and system margin ATN transmit setup time ATN receive setup timeCrosstalk time shift ISI of data Bus clear delay Bus free delayBus set delay Bus settle delay Flow control receive setup time Flow control transmit setup timePCRC receive setup time PCRC transmit setup time Data release delay Physical disconnection delayPower on to selection QAS arbitration delay Receive internal setup time Receive setup timeReceive internal hold time Receive negation period Reset delay Reset hold timeReset to selection Residual skew error System deskew delay Skew correction rangeStrobe offset tolerance System noise at launch Measurement points Clocking methods for data transfers LVD measurement points ST latching data vs. DT latching data Paced transfer on a Scsi bus DT synchronous transfer example Data transfer modes Asynchronous transfersSynchronous transfers Paced transfers ST Data phase parallel transfers DT Data phase parallel transfersData group transfers Information unit transfers Negotiation Negotiation algorithm When to negotiate Negotiable fieldsNegotiable fields and effects of successful negotiation Negotiation message pair Field name Responding message requirements Response shall beField Name Message Numerically Transfer agreements Transfer period factor Transfer period factor relationshipsValue Description Message Transfer rate Synchronous 12.6 REQ/ACK offset Transfer width exponent Protocol options Protocol options bitsIureq Bus phases resulting from Iureq changes Sdtr negotiation PPR negotiation setting Iureq to onePPR negotiation setting Iureq to zero PPR negotiation keeping Iureq set to zero Wrflow RdstrmRTI Retain Training Information Pcompen Negotiable field combinations TransferTransfer Period Message restrictions Negotiation message sequences Parallel Scsi Interface Product Manual, Rev. a Scsi bus phases overview BUS Free phaseUnexpected and expected bus free phases Expected bus free phases Arbitration and QAS overview Normal Arbitration phase QAS phase overview QAS protocol Selection phase Information unit transfers disabled Information unit transfers enabledSelection overview Selection using attention condition timeout procedure Reselection phase Reselection phase overviewPhysical reconnection Physical reconnection timeout procedure Scsi bus fairness Information transfer phases Information transfer phasesSignal Phase Direction of transfer Comment Asynchronous transfer Synchronous transferST synchronous data transfer DT synchronous transfer Information unit transferPage Data group data field transfer Page Page Page Paced transfer Paced transfer training pattern DT Data in phase training pattern Start of section aStart of section B DT Data OUT phase training pattern Start of section C 3.2 P1 data valid/invalid state transitions Starting pacing transfers at end of training pattern Starting pacing transfers with no training pattern Ending pacing transfers Paced information unit transfer Deskewing Wide transfer Command phase Data phase Status phase Message phase Signal restrictions between phases Message in phase exception condition handlingMessage OUT phase Message OUT phase exception condition handling Scsi bus phase sequences Scsi bus phase sequences overview Hard reset or protocol error Reselection Selection Arbitration DT Data Message OUT ST data bus protection using parity Parity checking rules for Selection and Reselection phasesData bus protection Data bus protection overview Error detection capabilities Order of bytes in the CRC field General message protocols and formats Message formats Message format One-byte messagesTwo-byte messages Extended messages Message categories Extended Message CodesLink Control Messages Link Control message codes Key Disconnect IdentifyIdentify message format Bit Byte Ignore Wide Residue Ignore Wide Residue message formatIgnore field definition Invalid data bits Initiator Detected Error Linked Command CompleteMessage Parity Error Message Reject Modify Data Pointer message format Modify Bidirectional Data Pointer Modify Bidirectional Data Pointer message format No Operation Parallel Protocol Request Parallel Protocol Request message format Value 00h 01h-FEh FFh Description Timing values Use ST Data in and ST Data OUT phases to transfer data Valid protocol options bit combinationsUse QAS for arbitration Parallel Protocol Request messages implied agreement Restore Pointers QAS RequestSave Data Pointers Synchronous Data Transfer Request Synchronous Data Transfer Request message format Sdtr messages implied agreements Target initiated Sdtr negotiation Initiator initiated Sdtr negotiationTask Complete Wide Data Transfer Request Wide Data Transfer Request message format Wdtr message implied agreement Target initiated Wdtr negotiationResponding Scsi device Wdtr response Implied agreement Task attribute messages Task attribute message overview and codes Task attribute message codes ACA Auto Contingent AllegianceACA message format Head of Queue Ordered Task management messages Task management message codes Task management message codesAbort Task 0Eh Logical Unit Reset Target ResetAbort Task SET Clear ACA Miscellaneous Scsi bus characteristics Bus reset condition Hard reset Reset events Asynchronous condition recovery Active pointers Saved pointers Command processing considerations and exception conditions Asynchronous event notificationIncorrect initiator connection Unexpected Reselection phase SPI information units Information unit transfer logical operationsPage 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 command information unit SPI information units SPI command information unit Bit Byte Task Attribute Codes Description Task Management flags Codes Description SPI LQ information unit SPI LQ information unit Bit Byte Bidi Direction SPI LQ information unit type Codes Type DescriptionF0H FFh AllPage SPI data information unit SPI data stream information unitSPI data information unit Bit Byte SPI status data stream information unit Bit Byte SPI status information unit SPI status information unit Bit ByteReserved Reserved for FCP SPI command information unit fields invalid Packetized Failures field Bit BytePacketized Failures code Codes Description Task management function not supportedPage 130 Parallel Scsi Interface Product Manual, Rev. a Command implementation requirements Command Descriptor Block CDBReserved Page Fixed and variable length Command Descriptor Block formats Typical CDB for 12-byte commands Bit Byte Typical CDB for 16-byte commands Bit ByteAdditional CDB Data if required Typical variable length CDB Bit Byte Operation Code 7Fh Additional CDB Length n-7Page Control field Bit Byte Last Naca aLink b Status Status precedence Command examples Single command example Disconnect example Disconnect example Timing examples Auto Contingent Allegiance or Contingent Allegiance Overlapped commands Clearing an Auto Contingent Allegiance condition Incorrect logical unit selection Sense dataAsynchronous Event Reporting Autosense Unit Attention condition Target hard reset Logical unit resetQueued tasks formerly queued I/O processes Untagged task queuing Tagged task queuing Parameter rounding Programmable operating definition Incorrect initiator connection Default self-test S.M.A.R.T. systemSelf-test operations Short and extended self-tests Foreground mode Background modeSelf-test modes Exception commands for background self-tests Device type a Command Reference All device types Self-test mode summary Error detection for asynchronous information phasesProtection code Covered signals Word Location Signal MeaningPage Error detection properties Code descriptionProtection code usage Error handling Protection code transmissionEnabling 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