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5.1.16. Seek—7XH
Bit ->
Command (7)
C/D/H (6)
Cyl High (5)
Cyl Low (4)
Sec Num (3)
Sec Cnt (2)
Feature (1)
This command is effectively a NOP command to the CompactFlash Memory Card although it does perform a range
check of cylinder and head or LBA address and returns an error if the address is out of range.
5.1.17. Set Features—EFH
Bit ->
Command (7)
C/D/H (6)
Cyl High (5)
Cyl Low (4)
Sec Num (3)
Sec Cnt (2)
Feature (1)
This command is used by the host to establish or select certain features. Table 5-22 defines all features that are
supported. Please note that the 9AH feature is unique to the CompactFlash Memory Card and are not part of the
ATA Specification.
Feature
01H
Enable 8-bit data transfer.
03H
Set Transfer Mode based on value and Sector Count register.
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.
®
CompactFlash
Memory Card Product Manual, Rev. 10.0 © 2002 SANDISK CORPORATION
Table 5-20. Seek
7
6
5
1
LBA
1
Table 5-21. Seat Features
7
6
5
X
Table 5-22. Features Supported
4
3
7XH
Drive
Head (LBA 27-24)
Cylinder High (LBA 23-16)
Cylinder Low (LBA 15-8)
X (LBA 7-0)
X
X
4
3
EFH
Drive
X
X
X
Config
Feature
Operation
ATA Command Description
2
1
0
2
1
0
X
5-15
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