Product manual

CompactFlash Memory Card Product Manual Preliminary

4.4 Card Configuration

The CompactFlash Memory Cards are identified

by appropriate information in the Card

Information Structure (CIS). The following

configuration registers are used to coordinate the

I/O spaces and the Interrupt level of cards that are

located in the system. In addition, these registers

provide a method for accessing status information

about the CompactFlash Card that may be used to

arbitrate between multiple interrupt sources on the

same interrupt level or to replace status

information that appears on dedicated pins in

memory cards that have alternate use in I/O cards.

Table 4-11 Registers and Memory Space Decoding

-CE2 -CE1 -REG -OE -WE A10 A9 A8-A4 A3 A2 A1 A0 SELECTED SPACE

1 1 X X X X X XX X X X X Standby

X 0 0 0 1 X 1 XX X X X 0 Configuration Registers Read

1 0 1 0 1 X X XX X X X X Common Memory Read (8 Bit D7-D0)

0 1 1 0 1 X X XX X X X X Common Memory Read (8 Bit D15-D8)

0 0 1 0 1 X X XX X X X 0 Common Memory Read (16 Bit D15-D0)

X 0 0 1 0 X 1 XX X X X 0 Configuration Registers Write

1 0 1 1 0 X X XX X X X X Common Memory Write (8 Bit D7-D0)

0 1 1 1 0 X X XX X X X X Common Memory Write (8 Bit D15-D8)

0 0 1 1 0 X X XX X X X 0 Common Memory Write (16 Bit D15-D0)

X 0 0 0 1 0 0 XX X X X 0 Card Information Structure Read

1 0 0 1 0 0 0 XX X X X 0 Invalid Access (CIS Write)

1 0 0 0 1 X X XX X X X 1 Invalid Access (Odd Attribute Read)

1 0 0 1 0 X X XX X X X 1 Invalid Access (Odd Attribute Write)

0 1 0 0 1 X X XX X X X X Invalid Access (Odd Attribute Read)

0 1 0 1 0 X X XX X X X X Invalid Access (Odd Attribute Write)

Configuration Registers Decoding

-CE2 -CE1 -REG -OE -WE A10 A9 A8-A4 A3 A2 A1 A0 SELECTED REGISTER

X 0 0 0 1 0 1 00 0 0 0 0 Configuration Option Reg Read

X 0 0 1 0 0 1 00 0 0 0 0 Configuration Option Reg Write

X 0 0 0 1 0 1 00 0 0 1 0 Card Status Register Read

X 0 0 1 0 0 1 00 0 0 1 0 Card Status Register Write

X 0 0 0 1 0 1 00 0 1 0 0 Pin Replacement Register Read

X 0 0 1 0 0 1 00 0 1 0 0 Pin Replacement Register Write

X 0 0 0 1 0 1 00 0 1 1 0 Socket and Copy Register Read

X 0 0 1 0 0 1 00 0 1 1 0 Socket and Copy Register Write

Note: The location of the card configuration registers should always be read from the CIS since these locations may vary in

future products. No writes should be performed to the CompactFlash Memory Card attribute memory except to the

card configuration register addresses. All other attribute memory locations are reserved.