SanDisk SDCFH-004G Product Manual - Page 74

Set Features-EFH

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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) Sec Cnt (2) X 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 01h 02h 03h 55h 66h 69h 81h 96h 9Ah BBh CCh Operation Enable 8-bit data transfer Enable Write Cache Set Transfer Mode based on value and Sector Count register. Disable Read Look Ahead Disable Power on Reset (POR) establishment of defaults at Soft Reset Accepted for backward compatibility with the SDP Series but has no impact on the CF Memory Card. Disable 8-bit data transfer Accepted for backward compatibility with the SDP Series but has no impact on the CF Memory Card Accepted for backward compatibility with the SDP Series but has no impact on the CF Memory Card 4 bytes of data apply on Read/Write Long commands 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

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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