Command Register | Maxtor 91536D6, 91024D4, 90750D3, 91280D5, 91792D7

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

Image 45

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

Contents

HA RD Drive Produc T MA Nual DiamondMax Plus Revisions Manual No U T I O N Before You Begin Contents Handling and Installation Product Specifications Host Software Interface AT Interface Description Interface Commands Service and SupportGlossary Figures Maxtor Corporation IntroductionManual Organization Abbreviations Conventions Signal ConventionsKey Words Numbering Product Description DiamondMax Plus 5120 Key Features Functional / Interface Product Features Logical Block Addressing On-the-Fly Hardware Error Correction Code ECCDefect Management Zone DMZ Software ECC Correction Cache Management Read-Ahead ModeBuffer Segmentation Automatic Write Reallocation AWR Major HDA Components Jumper Location/Configuration Subsystem ConfigurationCylinder Limitation Dual Drive Support Drive Configuration Product SpecificationsPerformance Specifications Models and Capacities Parameter Standard Metric Physical Dimensions Power Mode Definitions Power RequirementsEPA Energy Star Compliance Environmental Limits Shock and Vibration Reliability Specifications Safety Regulatory Compliance Radiated Electromagnetic Field Emissions EMC ComplianceCanadian Emissions Statement Hard Drive Handling Precautions Handling and InstallationPre-formatted Drive Important Notice Multi-pack Shipping Container Unpacking and Inspection Physical 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 Summary Pin Description Table PIN Name Signal Name Signal Description PIO Timing Timing Parameters Mode DMA Timing Timing Parameters all times in nanoseconds Ultra DMA Timing Sustained 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 Registers Sector Number Register Sector Count RegisterCylinder Number Registers Device/Head Register Command Register Summary Command Name Command Code Parameters Used SDH Alternate Status Register Control Diagnostic RegistersDevice Control Register Digital Input Register Reset and Interrupt Handling Reset HandlingInterrupt Handling Set Feature Commands Interface Commands Read Commands Read SectorsRead Verify Sectors Read Multiple Read DMA Set Multiple Mode Write CommandsWrite Sectors Write Verify Sectors Write DMA Write Multiple Set Features Mode Set Feature Commands Power Mode Commands Sleep Mode Identify Drive Initialization Commands 15-8 = 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 Set Service Policy Service and SupportNo Quibble Service Support MaxFax Service Customer ServiceInternet Glossary Direct Memory Access Direct AccessError Correction Code ECC Error Free Head Disk Assembly HDA Hard ErrorFile Allocation Table FAT Flux Changes PER Inch Logical Address Phase Locked Loop PLLLogical Block Addressing Logical Sector Read Gate Signal Random Access Memory RAMRecoverable Error Sector Pulse Signal Unrecoverable Error UN-CORRECTABLE ErrorWrite Gate Signal THIN-FILM Media