Usage, Queue Tag Numbers, Queue Full Status | Ciprico Rimfire 3880

			Chapter 8 Details of Usage
Page 8 - 10			Tagged Queuing
Notes on		The following provides additional detail about how tagged queuing works for
	Usage	the RF3880.
		Queue Tag Numbers
		•	The RF3880 will never have duplicate queue tag numbers assigned at the
			same time to any single device.
		•	The maximum number out to a device at one time will be 255.
		•	If all 255 tag numbers have been assigned to commands, the RF3880
			simply waits for previous commands to complete before sending any
			more tagged commands to that device.
		Queue Full Status
		•	If a device reports Queue Full status before it has received all possible
			255 commands, the RF3880 sets an internal threshold flag,
			(MAXIMUM_COMMANDS) equal to the number of commands out at
			the time of the Queue Full status.
		•	The command that generated the Queue Full status will once more be sent
			out to the device when the number of commands out to the device drops
			below the threshold set in MAXIMUM_COMMANDS. (One or more
			disconnected commands complete). This cuts down on unnecessary SCSI
			bus activity.
		•	Once below the MAXIMUM_COMMANDS threshold, additional
			commands will continue to be sent to the SCSI device until another Queue
			Full status is reported, at which time the MAXIMUM_COMMANDS
			threshold is set again.
		Message Reject
		•	On the initial command to a SCSI device for which tagged queuing has
			been enabled, the adapter verifies that the device accepted the queue tag
			message.
		•	If the device rejects the queue tag message, the RF3880 does not send
			further queue tag messages in order to avoid unnecessary SCSI bus
			activity.
		•	In the case of a message reject of a tag message, no error is reported to
			the host.

Tagged Queuing Statistics

The Extended Board Statistics command (16H) returns two fields, per target, that may be useful in evaluating the performance of tagged queuing with a SCSI-2 or SCSI-3 device. The fields are: Queue Full Count and Maximum Queued. See Chapter 7 for details.

21020285 D

User’s Guide

Image 184

Ciprico Rimfire 3880 manual Usage, Queue Tag Numbers, Queue Full Status, Message Reject, Tagged Queuing Statistics

Contents

Rimfire 3880 Scsi Host Bus Adapter Page Page 21020285 D User’s Guide Preface Organization Organization Initiator Mode Pass-through Commands DescribesOverview of the RF3880 User’s Guide Conventions Notational GraphicConventions Graphic Representation of Parameter Block Reference Documents 21020285 D Reference Documents Contents Scsi ID Status Block Format LUN LUN Table of Contents Description of Fields Command Identifier Diagnostic/Self-test 09H Table of Contents Table of Contents Introduction Summary Specifications Index O d u c t O v e r v i e w Latest Bus Specifications About Rimfire DesignBuffering scheme Product Overview About the Rimfire 3880 Design Target Mode Implementation Buffer Management What next? Product Overview What next? R d w a r e E s s e n t i a l s Summary IntroductionHardware Essentials Introduction Hardware Structure Description Intel 80186XLQLogic FAS Pipelined System Interface Data Buffer Hardware Essentials Block DiagramGenerator blocks are part of the PSI Board Addressing Choosing an Address ModifierChoosing a VMEbus Address Hardware Essentials Board Addressing Hardware Port Addresses Overview of the PortsHardware Essentials Hardware Ports General Hardware Port Addresses Hardware Essentials Hardware Ports General Address Buffer Port Hardware Essentials Address Buffer PortAddress Buffer Port Writes Address Modifier Field Hardware Essentials Address Buffer Port Control Field Control Field of Address Buffer Port Channel Attention Port Single Command Structure Address FieldsHardware Essentials Channel Attention Port Channel Format Channel Attention Status Port Reset Format Status Port ResetStatus Port Hardware Essentials Status Port Status Port Error Codes Status Port Error Codes Status Port General Format Status Port General Status Port Catastrophic Error Codes Chapter Hardware Essentials Status Port Reset Port Hardware Essentials Reset Port Descriptions of Port Usage Hardware Essentials Descriptions of Port Usage Hardware Essentials R d w a r e Installation Hardware Installation Introduction Overview Installation Process Step Unpacking Board Hardware Installation Unpacking the BoardShipping Damage Unpacking the Board Hardware Installation Jumpers and Termination Step Jumpers Termination Configuration Jumpers Default Jumper Settings Bus Request/ Grant Jumper Bus Request/Grant and Sysfail Jumpers Sysfail Jumper Example Base Address Jumper Settings ExampleAddresses For the Address Modifier Jumper Replacement Fuse Scsi bus Termination Hardware Installation Board Insertion General Steps Hardware Installation Apply power and observe LEDs Power-up SequenceMeaning LED’s Error Conditions Step Configure Connect Scsi Devices Hardware Installation Configure and Connect Scsi DevicesSelectable Options Options Scsi Cable Connector Cabling Hardware Installation M m a n d O p e r a t i o n Command Operation Introduction Command Operation What the Adapter must accomplish What the Adapter must accomplish Base ParameterBlock Parameter Command Descriptor Block Command Operation Base Status Block Base Status BlockStatus Block Format Base Status Block Command Operation Base Status Block Setting up Unit Options Multiple Status Blocks Single Command Structure Format Single Command StructureCommand Operation Single Command Structure Parameter Block Command Operation Single Command Structure Interrupt Bit-meanings of Interrupt Field Using a Single Command Structure Command Operation Using a Single Command Structure Some Example Single Commands Example Start Command List Board-controlCommand Operation Some Example Single Commands Command Identifier = 822F4H Command = 01H Interrupt = 0300H 21020285 D User’s Guide Example 2Inquiry Pass-through Command Example Pass-through command PB Command Operation Command Operation Some Example Single Commands Format Command List Structure Command List StructureDescription of the Fields Number of Parameter Blocks Number of Status BlocksParameter Block Space Status Block Space Creating Command List Structure Command Operation Creating the Command List Structure Using a Command List Structure Command GuidelinesCommand Operation Using a Command List Structure Index Guidelines Adding a Parameter Block Removing a Status Block Example ‘C’ Routines for Command List Command Operation Example ‘C’ Routines for Command List Stcdone Command Operation Example ‘C’ Routines for Command List Command Operation I t i a t o r t h r o u g h D e P a s s C o m m a n d s Initiator Mode Pass-through Commands Introduction Introduction Summary Command Format Initiator Pass- through Parameter Block FormatTarget ID Address Modifier Bit-meanings of Flags-1 Field Example DAT and DIR bit settings Setting DBV DAT and DIR Bits Using Table ValuesDIR and DAT Settings, Vendor-unique Table of DAT DIR Automatic Settings DAT and DIR Automatic Settings 4EH Initiator Mode Pass-through Commands Bit-meanings of Flag-2 Field Flags-2Meaning of TAG Opts Bits VME Memory Address Scsi Command Descriptor BlockTransfer Count Pass-through Message Parameter Block Message FormatMessage Code Scsi Pass-through Status Block Description of FieldsBit-meanings of Flags Field Error Bit-meanings of Scsi Status Field Scsi Status Field during Unexpected Scsi PhaseMeaning of Status Byte Code Three signals. This is described below Meaning of Status Byte Unexpected Phase Up to 32 Sequential Sense Bytes Default Ordering of Sense BytesOrdering of 1st 16 Sequential Sense Bytes Example of Selected Sense Bytes Initiator Mode Pass-through Commands R g e t t h r o u g h D e P a s s C o m m a n d s Target Mode Pass-through Commands Introduction What is Target Mode? Target Mode Pass-through Commands Overview of Target Mode Adapter must have a means of handling Scsi protocol issues Target Mode Pass-through CommandsWhat must the adapter accomplish in Target Mode? Overview Special Target Mode Commands New commandsTarget Mode Enable Command Target Mode Disable Command Command Descriptor Block Group Codes Scsi Command Descriptor Block Groups Sequence Events Enabling Target Mode Command OperationTarget Mode Pass-through Commands Command Operation Sequence Events Receiving a Command From an Initiator Sequence of Events Responding to an Initiator Target Selection Data Structure Target Selection Data Structure Meaning of Flags Field Meaning of Scsi Flags Field Command Descriptor Block Length Identify Message ReceivedInitiator Identifier Message Bytes Received Semaphore Field Target Mode Response Parameter Block Target Mode Response CommandInitiator ID ⇒ Target Mode Response command Meaning of Response Control Flags Field Message Byte Status or 1st Message Byte First TM Response Command Status Block Target Mode Response Command Status BlockSecond TM Response Command Status Block Meaning of Status Block Flags Field Meaning of Command Status Flags Field Target Mode Error Sequence Codes Message Byte Received A r d c o n t r o l C o m m a n d s Board-control Commands Introduction Using the Reference Board-control Commands Using the Reference Board-control Commands General Status Block General Status BlockGeneral Status Block Format General Status Block Board-control Commands List of Commands List of CommandsBoard-control Commands Board-control Commands Start Command List 01H Start Command List Parameter BlockCommand List Memory Address Adapter ID Board-control Commands Start Command List 01H Interrupt Command Code Board-control Commands Stop Command List 02H Stop Command List Parameter Block Identify Command Parameter Block Board-control Commands Identify 05HIdentify 05H Identify Command Status Block Identify Command Status BlockEngineering Revision Firmware Revision Board-control Commands Identify 05H Option Flags Option Flags Field Identify Status BlockAdapter Scsi ID Bits Day, Month, Year Board Statistics Command Parameter Block Board-control Commands Board Statistics 06HBoard Statistics 06H Board-control Commands Board Statistics 06H Options Options Field Total Commands Processed Total Scsi Commands issued to an IDTarget Mode Selection Count Statistics Data Structure Command Format Description of Fields Board-control Commands General Options 07HGeneral Options Command Parameter Block General Options 07H Bus Throttle Bus Throttle Field ValuesSelect Flags Select Flags Byte Command code for this command is 07H Board-control Commands Unit Options 08H Unit Options Command Parameter BlockUnit Options 08H Unit Scsi ID Board-control Commands Unit Options 08H Disconnect Time-out Retry LimitRetry Control Retry Control Unit Flags Select Time-outUnit Flags Initiator Mode Sense Count Selected Sense Bytes Example Use of Selected Sense Bytes Fields Example Selection of Sense Bytes Diagnostic/ Self-test 09H Board-control Commands Diagnostic/Self-test 09HDiagnostic/Self-test Parameter Block Diagnostics Command Test Flags Field Command code for this operation is 09H Flags Byte Diagnostic Command Status BlockBit-meanings of Flags Byte in Status Block Target Mode Enable 0AH Board-control Commands Target Mode Enable 0AHTarget Mode Enable Parameter Block Pointer to the Target Selection Data Structure Meaning of Selection Interrupt Field Target Mode Disable 0BH Board-control Commands Target Mode Disable 0BHTarget Mode Disable Parameter Block Meaning of Flags-1 Field Board-control Commands Abort 0DH Command Identifier of CMD to be AbortedAbort 0DH Abort Parameter Block Board-control Commands Scsi Hard Reset 10H Scsi Hard Reset 10HScsi Hard Reset Parameter Block Board-control Commands Board Information 15H Board Information 15H Board-control Commands Board Information 15H Options Board Information Data StructureBoard Information Options Field Board Information Data Structure Board Information Select Flags Field Board-control Commands Board Information 15H Bus Throttle Board-control Commands Board Information 15H Option Flags RST Reset Jumper Scsi Cfig Block Board-control Commands Board Information 15H TerminationAdapter Base Model # Per Target Retry Limit Per Target Sense CountPer Target Device Flags Bit-meanings of Device Flags Field Per Target Synch Period Per Target Width Per Target Selected Sense Bytes Extended Board Statistics 16H Board-control Commands Extended Board Statistics 16HExtended Board Statistics Parameter Block Board-control Commands Extended Board Statistics 16H Options Extended Board Options Field Total Commands Issued Number of Scsi Parity ErrorsPer Scsi Target Number of Commands Extended Statistics Data Structure Per Scsi Target Queue Full Count Board-control CommandsPer Scsi Target Maximum Queued Extended Unit Options 18H Board-control Commands Extended Unit Options 18HExtended Unit Options Parameter Block Extended Unit Options Data Structure Description of Fields Extended Unit Options Data Structure Bit-meanings of Retry Control Field Board-control Commands Extended Unit Options 18H Unit Flags Unit Flags of Extended Unit Options Board-control Commands Extended Unit Options 18H Selected Sense Bytes T a i l s o f U s a g e Details of Usage Introduction Need for Swapping Details of Usage Byte and Word SwappingExample of Memory Differences Variations in Intel and Motorola Memory Pass-through command Parameters Intel Ordering Motorola Ordering RF3880 Swapping Options Command Structure SwappingIntel Ordered Parameter Block Sharing Tapes Data SwappingDual Initiators How to Use TaggedQueuing Tagged Meaning of Flags-2 Field Details of Usage Tagged Queuing Choose a tag messageRF3880 sends the tag message Usage Queue Tag NumbersQueue Full Status Message Reject Scsi Bus Reset Handling Target Mode Usage Scsi Protocol HandlingSelection Queue Target Mode Disable Command Handling Abort Command Handling Synchronous Data Transfer Requests Wide Data Transfer Requests Parity error conditions Message parity errorsInitiator-detected Error messages Target Routines Message Handling Disconnect PrivilegeMessage Bytes Received from the Initiator 21020285 D User’s Guide User’s Guide 21020285 D Details of Usage Error codes Appendix a Error Codes Introduction Status Block Error CodesCodes Reported in Status Block and Status Port Appendix a Error Codes Summary Error Codes Appendix a Error Codes 2BH A1H Catastrophic Error Codes Status Port Error CodesAppendix a Error Codes Status Port Error Codes Self-test Error Codes Diagnostic Command Self-test Status Port Error Codes 8CH B l e s a n d C o n n e c t o r s Appendix B Cables and Connectors Introduction Connector Appendix B Cables and Connectors Scsi ConnectorCable Connector Pin-outs for the RF3886 Maximum Cable Length Appendix B Cables and Connectors VMEbus Connector Pinouts VMEbus Connector PinoutsP1 Connector P2 Connector Retry Appendix B Cables and Connectors Specification s Appendix C Specifications Introduction Appendix C Specifications SpecificationsSpecifications for the Rf3880 Appendix C Specifications 21020285 D User’s Guide Fault s Appendix D Defaults Introduction Hardware Defaults Appendix D Defaults Hardware DefaultsHardware Defaults Jumpers Defaults for Hardware Ports Appendix D Defaults DefaultsCommand Defaults TAG Appendix D Defaults S i g n D i f f e r e n c e s Appendix E Design Differences Introduction Features no longer Supported Appendix E Design Differences Features no longer SupportedScatter/Gather Operations Byte and Word Swapping of Data Status Port Error Codes and Test Flags Appendix E Design Differences Implementation DifferencesWidth of Data Transfers on the VMEbus Extended Scsi ID’s Block Mode Transfers Scsi Data Widths How to Maximize Performance Odd-byte Addressing D e Index User’s Guide 21020285 D PSI Scsi ID Index Page 21020285 D