Seagate STT8000A manual Supported ATA Commands, Previous Cmd Int Reason

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Chapter 5

ATAPI Interface

information. If you do not program this register correctly, the drive "hangs" in the BSY state. To correct this problem, reset operations.

Supported ATA Commands

The ATA commands are briefly described in the following paragraphs.

Execute Drive Diags (90h)

This command is executed regardless of the state of the DRV bit. The command causes an actual microprocessor reset (drive loses all logical position information). Power-up diagnostics are performed, and the PDIAG/DASP handshake is performed per ATA-2 specification. The master device will generate an interrupt.

Idle Immediate (E1h)

This command causes the device to set its Power Mode state to Idle and to generate an interrupt. Although the drive has no actual power saving features, this command is emulated for software compatibility.

Standby Immediate (E0h)

This command causes the device to set its Power Mode state to Standby and to generate an interrupt. Although the drive has no actual power saving features, this command is emulated for software compatibility.

Check Power Mode (E5h)

This command causes the device to return its Power Mode state in the Int Reason register, and generate an interrupt. If the drive is in Standby mode, this command returns 00h in the Int Reason register, otherwise this command returns FFh in the Int Reason register (indicating IDLE mode).

Previous Cmd	Int Reason
Reset/Power-up	FFh (Idle)
Standby Immed.	00h (Standby)
Idle Immediate	FFh (Idle)
Any Other Cmd	FFh (Idle)

Sleep (E6h)

This command is treated as an Idle command and does NOT prevent the drive from responding to further commands.

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STT8000A Product Manual

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Contents STT8000A Atapi Minicartridge Drive Product Manual Page FCC Notice Important Information About This Manual Table of Contents Atapi interface Tape format Glossary Acronyms and measurements Introduction Drive overviewSTT8000A internal drive without mounting brackets Features Typical system configurations Minicartridge technology overviewFlash Eeprom SoftwareReferences About this manual Chapter Title DescriptionSpecifications Physical specificationsOverview STT8000A 3.5-Inch mount general dimensions Power specifications Specification MeasurementPerformance specifications Feature SpecificationSpecification Operational Non-operational Environmental requirementsReliability Mean-Time-Between FailuresMean-Time-To-Repair Recommended tapes Tape capacities and formatsRegulatory compliance TUV & IEC-RHEINLANDBefore you begin InstallationIntroduction Handling guidelinesSetting jumpers Jumper block and jumper settingsInstalling the drive Aligning the drive in the computerMounting dimensions Mounting holes on internal drive without mounting brackets ATA-2 Interface pin assignments Pin Assignment Description SourceREQ Chapter Installation Drive operation and maintenance Front panel LEDUsing Travan cartridges Loading and unloading cartridgesSetting the write-protect switch Travan cartridge write-protect switch-locked positionLoading revised firmware via Seagate firmware cartridge Care and maintenance of the drive and cartridges Caring for tape cartridgesCaring for the drive Capstan Tape Head Troubleshooting Chapter ATA-2 Signals Atapi interface ATA-2 Interface ATA registers AbrtBits Mnemonic Description Supported ATA Commands Previous Cmd Int ReasonFeature Number Set Feature Commands Atapi Identify Device A1h Atapi Packet Command A0h Atapi interface DSCErase command Inquiry command Bit ByteLoad/Unload command Locate command Log Select command Log Sense command Error Counter Page Read Following table presents the Error Counter Page layoutTape Capacity Page Code Following table presents the Tape Capacity Page layoutMode Select command Mode Sense command Code DescriptionMode Parameter Header Mode Block DescriptorMode Medium Partition Mode Capabilities and Mechanical StatusMode Tape Parameters Read command Read Position command Following table describes the Read Position layoutChapter Atapi Interface Request Sense command Following table describes the Request Sense layout Rewind command Space command Test Unit Ready command Write command Write Filemark command Write Buffer download microcode command Tape format Tape partitioningTrack positions Track numbering Track formatFrames General track layout Tape reference servo pattern BlocksWrite equalization RandomizationChapter Tape format Block diagram Theory of operationsCartridge load mechanism Capstan drive motor assemblyMechanics ChassisSensors and switches Control circuitsHead design Media-Travan minicartridges Travan minicartridgeGlossary Appendix a Glossary Glossary Appendix a Glossary Acronyms and measurements Acronyms and abbreviationsLSI Units of measurement Measure MeaningAppendix B Acronyms and Measurements