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SanDisk CompactFlash Card OEM Product Manual Interface Description
3.4.2 Configuration Option Register (Address 200h in Attribute Memory)
The Configuration Option Register is used to configure the card’s interface, address decoding
and interrupt and to issue a soft reset to the CompactFlash Memory Card.
Operation D7 D6 D5 D4 D3 D2 D1 D0
R/W SRESET LevIREQ Conf5 Conf4 Conf3 Conf2 Conf1 Conf0
Bit
D7
D6
D5-D0
Name
SRESET
LevIREQ
Conf 5–Conf0
Description
Setting this bit to one (1), waiting the minimum reset width time and
returning to zero (0) places the card in the Reset state. Setting this bit to "1"
is equivalent to assertion of the +RESET signal except that the SRESET bit
is not cleared. Returning this bit to "0" leaves the card in the same un-
configured, Reset state as following power-up and hardware reset. This bit
is set to "0" by power-up and hardware reset. Using the PCMCIA Soft
Reset is considered a hard Reset by the ATA Commands. Contrast with
Soft Reset in the Device Control Register.
This bit is set to "1" when Level Mode Interrupt is selected, and"0" when
Pulse Mode is selected. Set to "0" by Reset.
Configuration Index. Set to "0" by reset. It's used to select operation mode
of the card as shown below. NOTE: Conf5 and Conf4 are reserved and
must be written as "0".
Table 3-20 Card Configurations
Conf5 Conf4 Conf3 Conf2 Conf1 Conf0 Disk Card Mode
0 0 0 0 0 0 Memory Mapped
0 0 0 0 0 1 I/O Mapped; any 16-byte system
decoded boundary
0 0 0 0 1 0 I/O Mapped; 1F0-1F7/3F6-3F7
0 0 0 0 1 1 I/O Mapped; 170-177/376-377
3.4.3 Card Configuration and Status Register (Address 202h in Attribute Memory)
The Card Configuration and Status Register contain information about the card's condition.
Operation D7 D6 D5 D4 D3 D2 D1 D0
Read Changed SigChg IOis8 0 0 PwrDwn Int 0
Write 0 SigChg IOis8 0 0 PwrDwn 0 0
© 2007 SanDisk Corporation 3-23 Rev. 12.0, 02/07