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ATA Command Description SanDisk CompactFlash Card OEM Product Manual
5.1.18 Set Features–EFH
This command is used by the host to establish or select certain features.
Table 5-26 Set Features
Bit 7 6 5 4 3 2 1 0
Command (7) EFH
C/D/H (6) X Drive X
Cyl High (5) X
Cyl Low (4) X
Sec Num (3) X
Sec Cnt (2) Config
Feature (1) Feature
Table 5-27 defines all features that are supported. The 9AH feature is unique to CompactFlash
Memory cards and are not part of the ATA Specification.
Table 5-27 Features Supported
Feature Operation
01h Enable 8-bit data transfer
02h Enable Write Cache
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.
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
IOIS16 signal will not be asserted for data register accesses.
02/07, Rev. 12.0 5-20 © 2007 SanDisk Corporation