Bus Throttle Field Values, Select Flags | Ciprico Rimfire 3880

Chapter 7 Board-control Commands

Page 7 - 16

General Options (07H)

Note

The adapter will enforce a minimum burst size equal to the transfer width. The adapter will also enforce a maximum burst for Block Mode transfers, in order to ensure adherence to the VME specification— rules 2.12 and 2.75— related to address boundaries.

Bus Throttle

The bus throttle control allows you to regulate the flow of SCSI data on the VMEbus. The flow of data is regulated by limiting the number of bytes that the adapter is allowed to transfer each time it acquires the bus. The adapter transfers the data in bursts. You may specify the number of bytes that the adapter transfers in a burst by placing the appropriate value in the Bus Throttle field.

The number of bytes in a burst is expressed as a power of 2. The possible values are 0 though 0BH.

The table below translates the Bus Throttle field values into number of bytes per burst.

The default setting for this field is 0BH, 2048 bytes per burst.

Value	Represents	Number of Bytes per Burst
00H	20	1
01H	21	2
02H	22	4
03H	23	8
04H	24	16
05H	25	32
06H	26	64
07H	27	128
08H	28	256
09H	29	512
0AH	210	1024
0BH	211	2048

Table 72: Bus Throttle Field Values

Select Flags

The Select Flags are used to determine several operating factors for the RF3880 adapter. Use of Block Mode transfers by the adapter is affected by Select Flags.

Other factors pertain to the SCSI bus: parity checking and disconnect/ reconnect.

The format of the Select Flags byte is as follows:

BITS

7	6	5	4	3	2	1	0

0	0	0	0	X	BMT	PAR	DIS

Table 73: Select Flags Byte

DIS Disconnect/Reconnect - With this bit you are able to select whether the RF3880 adapter will allow peripherals to disconnect from the SCSI bus while performing a command.

0 ⇒ Disallow Disconnect/Reconnect.

1 ⇒ Allow Disconnect/Reconnect.

The default value for this bit is one — allow disconnects on all commands.

21020285 D

User’s Guide

Image 140

Ciprico Rimfire 3880 manual Bus Throttle Field Values, Select Flags Byte

Contents

Rimfire 3880 Scsi Host Bus Adapter Page Page 21020285 D User’s Guide Preface Organization Overview of the RF3880 User’s Guide Initiator Mode Pass-through Commands DescribesOrganization 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 Hardware Essentials Introduction IntroductionSummary Hardware Structure Description Intel 80186XLQLogic FAS Pipelined System Interface Data Buffer Generator blocks are part of the PSI Block DiagramHardware Essentials 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 Hardware Essentials Channel Attention Port Single Command Structure Address FieldsChannel 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 Shipping Damage Unpacking the Board Hardware Installation Unpacking the BoardStep Unpacking 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 Meaning LED’s Power-up SequenceHardware Installation Apply power and observe LEDs 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 Description of the Fields Command List StructureFormat Command List Structure 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 DIR and DAT Settings, Vendor-unique Setting DBV DAT and DIR Bits Using Table ValuesExample DAT and DIR bit settings Table of DAT DIR Automatic Settings DAT and DIR Automatic Settings 4EH Initiator Mode Pass-through Commands Meaning of TAG Opts Bits Flags-2Bit-meanings of Flag-2 Field Transfer Count Scsi Command Descriptor BlockVME Memory Address Message Code Message FormatPass-through Message Parameter Block Bit-meanings of Flags Field Description of FieldsScsi Pass-through Status Block Error Meaning of Status Byte Code Scsi Status Field during Unexpected Scsi PhaseBit-meanings of Scsi Status Field Three signals. This is described below Meaning of Status Byte Unexpected Phase Ordering of 1st 16 Sequential Sense Bytes Default Ordering of Sense BytesUp to 32 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 What must the adapter accomplish in Target Mode? Target Mode Pass-through CommandsAdapter must have a means of handling Scsi protocol issues Overview Special Target Mode Commands New commandsTarget Mode Enable Command Target Mode Disable Command Command Descriptor Block Group Codes Scsi Command Descriptor Block Groups Target Mode Pass-through Commands Command Operation Command OperationSequence Events Enabling Target Mode 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 Initiator ID Target Mode Response CommandTarget Mode Response Parameter Block ⇒ Target Mode Response command Meaning of Response Control Flags Field Message Byte Status or 1st Message Byte Second TM Response Command Status Block Target Mode Response Command Status BlockFirst 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 CommandsBoard-control Commands List of 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 05H Board-control Commands Identify 05HIdentify Command Parameter Block 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 06H Board-control Commands Board Statistics 06HBoard Statistics Command Parameter Block 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 Bit-meanings of Flags Byte in Status Block Diagnostic Command Status BlockFlags Byte 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 Scsi Hard Reset Parameter Block Scsi Hard Reset 10HBoard-control Commands Scsi Hard Reset 10H 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 Adapter Base Model # Board-control Commands Board Information 15H TerminationScsi Cfig Block 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 Parameter Block Board-control Commands Extended Board Statistics 16HExtended Board Statistics 16H 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 Maximum Queued Board-control CommandsPer Scsi Target Queue Full Count Extended Unit Options Parameter Block Board-control Commands Extended Unit Options 18HExtended Unit Options 18H 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 Intel Ordered Parameter Block Command Structure SwappingRF3880 Swapping Options Dual Initiators Data SwappingSharing Tapes How to Use TaggedQueuing Tagged RF3880 sends the tag message Details of Usage Tagged Queuing Choose a tag messageMeaning of Flags-2 Field Usage Queue Tag NumbersQueue Full Status Message Reject Selection Queue Target Mode Usage Scsi Protocol HandlingScsi Bus Reset Handling 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 Bytes Received from the Initiator Disconnect PrivilegeMessage Handling 21020285 D User’s Guide User’s Guide 21020285 D Details of Usage Error codes Codes Reported in Status Block and Status Port Status Block Error CodesAppendix a Error Codes Introduction Appendix a Error Codes Summary Error Codes Appendix a Error Codes 2BH A1H Appendix a Error Codes Status Port Error Codes Status Port Error CodesCatastrophic 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 P1 Connector VMEbus Connector PinoutsAppendix B Cables and Connectors VMEbus Connector Pinouts P2 Connector Retry Appendix B Cables and Connectors Specification s Appendix C Specifications Introduction Specifications for the Rf3880 SpecificationsAppendix C Specifications 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 Command Defaults DefaultsAppendix D 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