Seagate ST760211DE Set Features command, Features register values, Transfer mode, Read look-ahead

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4.2.2Set Features command

This command is used by the host to establish parameters that affect the execution of certain drive features. The supported features determined by the value in the Features register are as shown in Table 10. Read look- ahead and write cache are enabled by default upon power on.

Table 10:		Features register values
	Feature	Description

	02h	Enable Write Cache

	03h	Set DMA and PIO transfer modes based on the value in the Sector Count register.
		Sector Count register values
		08h: Set PIO Transfer Mode 0
		09h: Set PIO Transfer Mode 1
		0Ah: Set PIO Transfer Mode 2
		0Bh: Set PIO Transfer Mode 3
		0Ch: Set PIO Transfer Mode 4
		20h: Set Multiword Transfer Mode 0.
		21h: Set Multiword Transfer Mode 1.
		22h: Set Multiword Transfer Mode 2.
		40h: Set Ultra DMA mode 0.
		41h: Set Ultra DMA mode 1.
		42h: Set Ultra DMA mode 2.
		44h: Set Ultra DMA mode 4.

	05h	Enable Advanced Power Management (APM) with APM level as in the Sector Count register .
		Sector Count register values
		0h : Reserved
		1h – 7Fh : Allow Spin-Down (Standby Mode)
		80h – FEh : Disallow Spin-Down (Low Power Idle Mode)
		FFh : Reserved

	55h	Disable Read Look-Ahead.

	82h	Disable Write Cache.

	85h	Disable Advanced Power Management (APM)

	AAh	Enable Read Look-Ahead .

The following drive features are set after a Power On Reset, Hardware Reset or Software Reset.

Transfer mode :

Power On Reset	PIO 4, MDMA 2
Hardware Reset	PIO 4, MDMA 2
Software Reset	Current setting
Read look-ahead :
Power On Reset	Enabled
Hardware Reset	Enabled
Software Reset	Current setting

Write Cache :

Power On Reset	Enabled
Hardware Reset	Enabled
Software Reset	Current setting
	APM :
Power On Reset	C0h
Hardware Reset	Current setting
Software Reset	Current setting

30	Lyrion Series IDE Product Manual, Rev. B

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Contents Lyrion Series IDE ST760211DE ST730212DERevision history Revision Date Sheets affected or commentsContents Lyrion Series IDE Product Manual, Rev. B List of Figures Lyrion Series IDE Product Manual, Rev. B Introduction Lyrion Series IDE interface disc driveDisclaimer Drive careDrive specifications SpecificationsDrive specification ST760211DE ST730212DE OverviewDefault logical geometry LBA mode addressingFormatted capacity Model Cylinders Heads SectorsPhysical characteristics Technology SpecificationRecording and interface technology Time to readyPower specifications DC power Power Consumption at Average WTypical current profile Conducted noise Power-management modes Active modeStandby/Sleep mode Power modes Heads Spindle BufferEnvironmental specifications Shock Operating shockNonoperating shock VibrationOperating sweep sine vibration Operating random vibrationOperating random vibration profile Nonoperating sweep sine vibrationNonoperating random vibration Nonoperating random vibration profileCorrosive environment Acoustics Electromagnetic immunityReliability Drive level acousticsSafety certification Agency certificationElectromagnetic compatibility Korean RRLChina Restriction of Hazardous Substances RoHS Directive FCC verificationPage Lyrion Series IDE Product Manual, Rev. B Configuring and mounting the drive Handling and static discharge precautionsPage Drive installation Lyrion Series mechanical dimensions-top, side and end viewMounting considerations Lyrion Series Area for Protective MountingConnector interface signals and connector pins 40-way ZIF IDE interface connector signalsPin number Signal Name Description Interface descriptionWay ZIF IDE interface connector signals Supported ATA commands Supported commandsCommand Name Command Op-Code Command Type Supported commands Identify Device command Word ATA specification ValueLyrion Series IDE Product Manual, Rev. B Xxxx Serial Number Set Features command Features register valuesTransfer mode Read look-aheadRegister default values Power On Reset Hardware Reset Software ResetLyrion Series IDE Product Manual, Rev. B Seagate Technology support services InternetPresales Support Technical SupportWarranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Publication feedback survey Lyrion Series IDE Product Manual, Rev. B Index Page Page Seagate Technology LLC

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