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ATA Command Description
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.
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.
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 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.
5.1.18. Set Multiple Mode—C6H
Bit ->
Command (7)
C/D/H (6)
Cyl High (5)
Cyl Low (4)
Sec Num (3)
Sec Cnt (2)
Feature (1)
This command enables the CompactFlash 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 CompactFlash Card supports only a block size of 1 sector per block. Future versions may
support larger block sizes. Upon receipt of the command, the CompactFlash Card sets BSY to 1 and checks the
Sector Count Register.
5-16
PIO Default Transfer Mode
PIO Flow Control Transfer Mode x
Multiword DMA Mode x
Reserved
Reserved
Table 5-23. Seat Multiple Mode
7
6
5
X
®
CompactFlash
Memory Card Product Manual, Rev. 10.0 © 2002 SANDISK CORPORATION
00000 00d
00001 nnn
00100 nnn
01000 nnn
10000 nnn
4
3
2
C6H
Drive
X
X
X
Sector Count
X
1
0
X
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