Maxtor VL 17 manual Command Register

Page 45

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

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Image 45

Contents HA RD Drive Produc T MA Nual DiamondMaxVL REV EC no Section Description Date 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 VL 17 Key FeaturesFunctional / Interface Product FeaturesOn-the-Fly Hardware Error Correction Code ECC Logical Block AddressingDefect Management Zone DMZ Cache Management Major 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 Tools for Installation Handling PrecautionsSystem Requirements Drive Identification InformationHard Drive Identification General RequirementsInstalling 5.25-inch Mounting Brackets and Rails Systems Using Cable SelectInstalling in a Device Bay Mounting Drive in SystemAttaching System Cables Attaching Interface and Power CablesSystem Setup Setting the Bios CmosBios Cmos Parameters Hard Drive Preparation System Hangs During Boot PIN Signal Interface ConnectorAT Interface Description Pin Description SummaryPin Description Table PIN Name Signal Name Signal DescriptionPIO Timing Timing Parameters ModeDMA Timing Ultra DMA Timing Mode MIN MAXSustained 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 Command Name Command Code Parameters Used Timer Value TIME-OUT PeriodSummary Alternate 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 Feature Commands Set Features ModeValue Description Power Mode Commands Sleep Mode Initialization Commands Word Content DescriptionIdentify Drive 15-8 = PIO data transfer mode = Write Cache enabled Initialize Drive Parameters Execute Drive Diagnostic Seek, Format and Diagnostic CommandsError Code Description Format TrackExecute S.M.A.R.T A.R.T. Command SetService Policy Service and SupportNo Quibble Service SupportMaxFax Service Customer ServiceInternet Glossary Access TimeCylinder Zero Gigabyte GB Logical Block Addressing Read Gate Signal THIN-FILM Media