Product manual

CompactFlash Memory Card Product Manual Preliminary

Table 6-5 Features Supported

Feature Operation

01H Enable 8 bit data transfer.

55H Disable Read Look Ahead.

66H Disable Power on Reset (POR) establishment of defaults at Soft Reset.

69H Accepted for backward compatibility with the SDP Series but has no impact on the CF Memory Card.

81H Disable 8 bit data transfer.

96H Accepted for backward compatibility with the SDP Series but has no impact on the CF Memory Card.

9AH Accepted for backward compatibility with the SDP Series but has no impact on the CF Memory Card.

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 mode. If the 01H feature com-

mand is issued, all data transfers will occur on the

low order D7-D0 data bus and the IOIS16 signal

will not be asserted for data register accesses.

Features 55H and BBH are the default features for

the CompactFlash Memory Card; thus, the host

does not have to issue this command with these

features unless it is necessary for compatibility

reasons.

The 9AH Feature is accepted for backward

compatibility with the SDP Series but has no

impact on the CompactFlash Memory Card.

SanDisk does not recommend the use of this

command in new designs.

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.

POR defaults the number of heads and sectors along

with 16 bit data transfers and the read/write multiple

block count.