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CompactFlash Memory Card Interface Description
For the Attribute Memory Read function, signals -REG and -OE must be active and -WE inactive during the cycle.
As in the Main Memory Read functions, the signals -CE1 and -CE2 control the even-byte and odd-byte address, but
only the even-byte data is valid during the Attribute Memory access. Refer to Table 3-11 below for signal states and
bus validity for the Attribute Memory function.
Function Mode
Standby Mode
Read Byte Access CIS ROM
(8 bits)
Write Byte Access CIS (8 bits)
(Invalid)
Read Byte Access Configuration
(8 bits)
Write Byte Access Configuration
(8 bits)
Read Word Access CIS (16 bits)
Write Word Access CIS (16 bits)
(Invalid)
Read Word Access Configuration
(16 bits)
Write Word Access Configuration
(16 bits)
NOTE: The -CE signal or both the -OE signal and the -WE signal must be de-asserted between consecutive cycle
operations.
3.4.2. 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
R/W
SRESET
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).
3-20
Table 3-16. Attribute Memory Function
-REG
-CE2
-CE1
X
H
H
L
H
L
L
H
L
L
H
L
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
D6
D5
LevlREQ
Conf5
®
CompactFlash
Memory Card Product Manual, Rev. 10.0 © 2002 SANDISK CORPORATION
A9
A0
-OE
X
X
X
L
L
L
L
L
H
H
L
L
H
L
H
L
X
L
L
X
H
H
X
L
H
X
H
D4
D3
Conf4
Conf3
Conf2
-WE
D15-D8
D7-D0
X
High Z
High Z
H
High Z
Even Byte
L
Do not care
Even Byte
H
High Z
Even Byte
L
Do not care
Even Byte
H
Not Valid
Even Byte
L
Do not care
Even Byte
H
Not Valid
Even Byte
L
Do not care
Even Byte
D2
D1
D0
Conf1
Conf0
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