Seagate 6450, 6451 manual PIO and DMA Data-Transfer Modes, Upper 5 bits

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Medalist Pro 6450/6451 Product Manual, Rev. B

33

 

 

 

3.2.2.1 PIO and DMA Data-Transfer Modes

You can set the multiword DMA mode and identify the PIO data-transfer mechanism and transfer mode with the Set Features command. To set the multiword DMA mode:

1.Write Set Features command value 03H (Set Data Transfer mode) to the Features register.

2.Write a transfer types value to the Sector Count register. The upper 5 bits of this value define the type of data transfer, and the lower 3 bits encode the mode value. This changes word 63 of the Identify Drive command to the value you enter in the Sector Count register.

The following table identifies allowable transfer types values:

Data-Transfer Mechanism

Transfer Types value

 

 

 

 

Mechanism name

Mode

Data

Lower 3 bits

value

Upper 5 bits

PIO Transfer Mode (default)

2

00000

000

PIO Transfer Mode: Disable

2

00000

001

IORDY Set PIO Mode = 2

 

 

 

PIO Flow Control Transfer

0

00001

000

Mode: Set PIO Mode = 0

 

 

 

PIO Flow Control Transfer

1

00001

001

Mode: Set PIO Mode = 1

 

 

 

PIO Flow Control Transfer

2

00001

010

Mode: Set PIO Mode = 2

 

 

 

PIO Flow Control Transfer

3

00001

011

Mode: Set PIO Mode = 3

 

 

 

PIO Flow Control Transfer

4

00001

100

Mode: Set PIO Mode = 4)

 

 

 

Obsolete

 

00010

nnn

 

 

 

 

Multiword DMA Mode

0

00100

000

 

 

 

 

Multiword DMA Mode

1

00100

001

Multiword DMA Mode

2

00100

010

Synchronous DMA Mode

 

01000

nnn

 

 

 

 

Reserved

—

10000

nnn

 

 

 

 

Note. If the drive does not support a commanded mode, it returns a 04 aborted command error.

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Contents Product Manual Page Product Manual Page Contents ATA interface Configuring and mounting the driveAppendix. Timing diagrams Figures Medalist Pro 6450/6451 Product Manual, Rev. B Introduction Energy-efficiency CapacityPerformance Drive specification ST36450A ST36451A Quick specification chartVoltage tolerance including noise +12V Formatted capacity SpecificationsStandard configuration ST36450A ST36451A Functional specificationsPhysical organization Multisegmented cache buffer Physical dimensionsSeek time Start and stop times Typical power-up and power-down sequencePower-down sequence Power-up sequencePower specifications Power management Auto-parkIdle mode Active modeStandby mode Sleep modeInput noise Power consumptionEnvironmental specifications 1.13.1 Ambient temperature Altitude Temperature gradientRelative humidity Shock and vibrationAcoustics Overall A-weighted Value IdleReliability Agency listingsFCC verification Electromagnetic Compliance for the European UnionPage Sicherheitsanleitung Handling and static-discharge precautions Configuring and mounting the drivePower connector I/O cable and connectorPart Description Part Description Part numberOptions jumper block ConnectorsConfiguration Settings Master/slave configurationRemote LED connection Alternate capacity jumperCable-select option Mounting the drive Connecting cable-selected drivesMounting dimensions Medalist Pro 6450/6451 Product Manual, Rev. B ATA Interface ATA Interface connector pin assignmentsATA interface connector pin assignments Command name Parameters used Command setCA, CB Word Description Value Identify drive command ECHWord Description Value Word Description Value Feature Value Set Features command EFHUpper 5 bits PIO and DMA Data-Transfer ModesSleep command 99H, E6H Standby timer timeout periodSector Count Register contents Corresponding timeout period Automatic ReallocationProtocol Rules Synchronous DMA Transfer Signal Line DefinitionsSignal Line Definitions New Definitions Old Definitions Field/Bit Description Error RegisterTime Description Min Max Appendix. Timing diagramsProgrammed I/O timing with Iordy TKR Sustained Synchronous DMA burst Time Description ModePage Page

6451, 6450 specifications

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