SanDisk CompactFlash Extreme III - Manual (Page 75)

SanDisk CompactFlash Card OEM Product Manual ATA Command Description
A host can choose the transfer mechanism by Set Transfer Mode and specifying a value in the
Sector Count register. The upper 5 bits define the type of transfer and the low order 3 bits
encode the mode value.
Mode Value
PIO Default Transfer Mode 00000 00d
PIO Flow Control Transfer Mode x 00001 nnn
Multiword DMA Mode x 00100 nnn
Reserved 01000 nnn
Reserved 10000 nnn
Where “nnn” is a valid mode number in binary; “x” is the mode number in decimal for
the associated transfer type; and “d” is ignored.
Features 55H and BBH are the default features for CompactFlash cards; 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 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.
5.1.19 Set Multiple Mode–C6H
This command enables the card to perform Read and Write Multiple operations and establishes
the block count for these commands. The Sector Count Register is loaded with the number of
sectors per block. The current version of the card supports only a block size of 1 sector per
block. Future versions may support larger block sizes. Upon receipt of the command, the card
sets BSY to 1 and checks the Sector Count Register.
© 2007 SanDisk Corporation 5-21 Rev. 12.0, 02/07