HANBit

HFDOM44S3Vxxx

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HANBit Electronics Co., Ltd.

Rev. 1.0 (January, 2005)

This command is used by the host to establish or select certain features. Table 45 defines all features that are

supported.

Feature Supported

Feature

Operation

01h

Enable 8 – bit data transfers

0Ah

Enable Power Level 1 commands

55h

Disable Read Look Ahead

66h

Disable Power on Reset(POR) establishment of defaults at Soft Reset

69h

NOP – Accepted for backward compatibility

81h

Disable 8 – bit data transfer

8Ah

Disable Power Level 1 commands

96h

NOP – Accepted for backward compatibility

97h

Accepted for backward compatibility . Use of this Feature is not recommended

9Ah

Set the host current source capability. Allows tradeoff between current drawn and

read/write speed.

BBh

4 bytes of data apply on Read/Write Long commands

CCh

Enable Power on Reset (POR) establishment of defaults at Soft Reset

Features 01h and 81h are used to enable and clear 8 bit data transfer modes in True IDE Mode. If the 01h feature

command is issued all data transfers will occur on the low order D7D0 data bus and the IOIS16 signal will not be

asserted for data register accesses.

Features 0Ah and 8Ah are used to enable and disable Power Level 1 commands. Feature 0Ah is the default

feature for the CompactFlash Storage Card with extended power.

Features 55h and BBh are the default features for the CompactFlash Storage Card; thus, the host does not have to

issue this command with these features unless it is necessary for compatibility reasons. Feature code 9Ah enables

the host to configure the card to best meet the host system’s power requirements. The host sets a value in the

Sector Count register that is equal to one-fourth of the desired maximum average current (in mA) that the card

should consume. For example, if the Sector Count register is set to 6, the card would be configured to provide the

best possible performance without exceeding 24 mA. Upon completion of the command, the card responds to the

host with the range of values supported by the card. The minimum value is set in the Cylinder Low register, and the

maximum value is set in the Cylinder Hi register. The default value, after a power on reset, is to operate at the

highest performance and therefore the highest current mode. The card will accept values outside this

programmable range, but will operate either at the lowest power or highest performance as appropriate.

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

Defaults will be

set when a soft reset occurs. The default setting is to revert to the POR defaults when a soft reset occurs.

Set Multiple Mode – C6h

Bit->

7

6

5

4

3

2

1

0

Command(7)

C6h

C/D/H(6)

X

Drive

X

Cyl High(5)

X

Cyl Low(4)

X

Sec Num(3)

X

Sec Cnt(2)

Sector Count

Feature(1)

X