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4.3 Configuration Option Register(Base + 00h 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 Storage Card.
SRESET - Soft Reset: setting this bit to one (1), waiting the minimum reset width time and returning to zero (0) places the
CompactFlash Storage 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 Storage 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. For CompactFlash Storage Cards, 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 is used to select operation mode of the CompactFlash
Storage Card as shown below.
Note: Conf5 and Conf4 are reserved for CompactFlash Storage cards and shall be written as zero (0).
4.4 Card Configuration and Status Register (Base + 02h in Attribute Memory)
The Card Configuration and Status Register contains information about the Card's condition.
Changed: indicates that one or both of the Pin Replacement register CReady, or CWProt bits are set to one (1). When
the Changed bit is set, -STSCHG Pin 46 is held low if the SigChg bit is a One (1) and the CompactFlash
Storage Card is configured for the I/O interface.
SigChg: this bit is set and reset by the host to enable and disable a state-change "signal" from the Status Register, the
Changed bit controls pin 46, the Changed Status signal. If no state change signal is desired, this bit is set to zero
(0) and pin 46 (-STSCHG) signal is then held high while the CompactFlash Storage Card is configured for I/O.
IOis8: the host sets this bit to a one (1) if the CompactFlash Storage Card is to be configured in an 8 bit I/O Mode. The
Transcend Information Inc.
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