CompactFlash Memory Card Product Manual
SanDisk CompactFlash Memory Card Product Manual © 1998 SANDISK CORPORATION40
4.4.2 Configuration Option Register (Address
200h in Attribute Memory)
The Configuration Option Register is used to
configure the cards 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 LevlREQ Conf5 Conf4 Conf3 Conf2 Conf1 Conf0
SRESET Soft Reset - Setting this bit to one (1), waiting the minimum reset width time and returning to zero
(0) places the CompactFlash Memory Card in the Reset state. Setting this bit to one (1) is
equivalent to assertion of the +RESET signal except that the SRESET bit is not cleared.
Returning this bit to zero (0) leaves the CompactFlash Memory Card in the same un-configured,
Reset state as following power-up and hardware reset. This bit is set to zero (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.
LevlREQ This bit is set to one (1) when Level Mode Interrupt is selected, and zero (0) when Pulse Mode is
selected. Set to zero (0) by Reset.
Conf5 - Conf0 Configuration Index. Set to zero (0) by reset. It's used to select operation mode of the
CompactFlash Memory Card as shown below.
Note: Conf5 and Conf4 are reserved and must be written as zero (0)
Table 4-13 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
4.4.3 Card Configuration and Status Register
(Address 202h in Attribute Memory)
The Card Configuration and Status Register
contains information about the Card’s condition.
Card Configuration and Status Register Organization:
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
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