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3.2.1.15 Set Features - EFH

This command is used by the host to establish or select certain features. Table 3-5 defines all features that are

supported.

Features 01H and 81H are used to enable and clear 8-bit data transfer mode. If the 01H feature

command is issued all data transfers will occur on the low order D7-D0 data bus and the IOCS16#

signal will not be asserted for data register accesses.

Features 55H and BBH are the default features for the ADM; thus, the host does not have to issue this

command with these features unless it is necessary for compatibility reasons.

Features 66H and CCH can be used to enable and disable whether the Power On Reset (POR)

Defaults will be set when a software Reset occurs.

Bit ->

Command (7)

EFH

C/D/H (6)

XDrive

Cyl High (5)

Cyl Low (4)

Sec Num (3)

Sec Cnt (2)

Config

Feature (1)

Feature

TABLE

3-5: FEATURES SUPPORTED

Feature

Operation

01H

Enable 8-bit data transfers.

55H

Disable Read Look Ahead.

66H

Disable Power on Reset (POR) establishment of defaults at software Reset.

69H

NOP - Accepted for backward compatibility.

81H

Disable 8-bit data transfer.

96H

NOP - Accepted for backward compatibility.

97H

NOP - Accepted for backward compatibility.

9AH

NOP - accepted for compatibility.

BBH

4 Bytes of data apply on Read/Write Long commands.

CCH

Enable Power on Reset (POR) establishment of defaults at software Reset.

T3-5.1 519

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