Maxtor 91536D6, 91024D4, 90750D3, 91280D5, 91792D7, 92048D8 manual Command Register

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HOST SOFTWARE INTERFACE

Command Register

Contains code for the command to be performed. Additional command information should be written to the task file before the Command register is loaded. When this register is written, the BUSY bit in the Status register sets, and interrupt request to the host clears; invalid commands abort. (Detailed information on interface commands is given in Section 7.) Hex values for valid command formats follow:

Read Commands

Read	Sector(s)	20h	Normal	reads;	retries	enabled
		21h	Normal	reads;	retries	disabled
		22h	Read Long; retries enabled
		23h	Read Long; retries disabled
Read	Verify Sector(s)	40h	Retries	enabled
		41h	Retries	disabled
Read Sector Buffer		E4h
Read Multiple		C4h
Read DMA		C8h
		C9h	No retries

Write Commands

Write	Sector(s)		30h	Normal	writes;	retries	enabled
			31h	Normal	writes;	retries	disabled
			32h	Write Long; retries enabled
			33h	Write Long; retries disabled
Write	Verify	Sector(s)	3Ch
Write	Sector	Buffer	E8h
Write Multiple			C5h
Write DMA			CAh
			CBh	No retries

Mode Set/Check Commands

Set Features	EFh
Set Multiple Mode	C6h

Power Mode Commands

Standby Immediate	94/E0h Stops drive spindle; do not change time-out value
Idle Immediate	95/E1h Starts spindle; do not change time-out value
Standby	96/E2h Stops spindle; change time-out value
Idle	97/E3h Starts spindle; change time-out value
Check Power Mode	98/E5h
Set Sleep Mode	99/E6h

Initialization Commands

Identify	Drive	ECh
Initialize	Drive Parameters	91h
Re-calibrate		1xh

Seek, Format, and Diagnostic Commands

Seek	7xh
Format Track	50h
Execute Drive Diagnostic	90h

S.M.A.R.T. Commands

Execute S.M.A.R.T.

B0h

6 – 3

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Contents HA RD Drive Produc T MA Nual DiamondMax Plus Revisions Manual No U T I O N Before You BeginContents Handling and Installation Product SpecificationsHost Software Interface AT Interface DescriptionInterface Commands Service and SupportGlossary Figures Maxtor Corporation IntroductionManual Organization AbbreviationsConventions Signal ConventionsKey Words NumberingProduct Description DiamondMax Plus 5120 Key FeaturesFunctional / Interface Product FeaturesLogical Block Addressing On-the-Fly Hardware Error Correction Code ECCDefect Management Zone DMZ Software ECC CorrectionCache Management Read-Ahead ModeBuffer Segmentation Automatic Write Reallocation AWRMajor HDA Components Jumper Location/Configuration Subsystem ConfigurationCylinder Limitation Dual Drive SupportDrive Configuration Product SpecificationsPerformance Specifications Models and CapacitiesParameter Standard Metric Physical DimensionsPower Mode Definitions Power RequirementsEPA Energy Star Compliance Environmental LimitsShock and Vibration Reliability SpecificationsSafety Regulatory Compliance Radiated Electromagnetic Field Emissions EMC ComplianceCanadian Emissions Statement Hard Drive Handling Precautions Handling and InstallationPre-formatted Drive Important NoticeMulti-pack Shipping Container Unpacking and InspectionPhysical Installation Recommended Mounting ConfigurationRepacking Before You Begin General Requirements Mounting Drive in System Attaching Interface Power Cables System Setup Hard Drive Preparation System Hangs During Boot Signal Interface ConnectorAT Interface Description Pin Description SummaryPin Description Table PIN Name Signal Name Signal DescriptionPIO Timing Timing Parameters ModeDMA Timing Timing Parameters all times in nanoseconds Ultra DMA TimingSustained Ultra DMA Data In Burst Device Terminating an Ultra DMA Data In Burst Initiating an Ultra DMA Data Out Burst Device Pausing an Ultra DMA Data Out Burst Device Terminating an Ultra DMA Data Out Burst Features Register Error RegisterHost Software Interface Task File RegistersSector Number Register Sector Count RegisterCylinder Number Registers Device/Head RegisterCommand Register Summary Command Name Command Code Parameters Used SDHAlternate Status Register Control Diagnostic RegistersDevice Control Register Digital Input RegisterReset and Interrupt Handling Reset HandlingInterrupt Handling Set Feature Commands Interface CommandsRead Commands Read SectorsRead Verify Sectors Read Multiple Read DMASet Multiple Mode Write CommandsWrite Sectors Write Verify SectorsWrite DMA Write MultipleSet Features Mode Set Feature CommandsPower Mode Commands Sleep Mode Identify Drive Initialization Commands15-8 = PIO data transfer mode = Write Cache enabled Initialize Drive Parameters Seek, Format and Diagnostic Commands Execute Drive DiagnosticFormat Track Execute S.M.A.R.T A.R.T. Command SetService Policy Service and SupportNo Quibble Service SupportMaxFax Service Customer ServiceInternet Glossary Direct Memory Access Direct AccessError Correction Code ECC Error FreeHead Disk Assembly HDA Hard ErrorFile Allocation Table FAT Flux Changes PER InchLogical Address Phase Locked Loop PLLLogical Block Addressing Logical SectorRead Gate Signal Random Access Memory RAMRecoverable Error Sector Pulse SignalUnrecoverable Error UN-CORRECTABLE ErrorWrite Gate Signal THIN-FILM Media