SanDisk CompactFlash User Manual

CompactFlash Memory Card Product Manual
SanDisk CompactFlash Memory Card Product Manual © 1998 SANDISK CORPORATION 39
4.4.1 Attribute Memory Function
Attribute memory is a space where CompactFlash
Memory Card identification and configuration
information is stored, and is limited to 8-bit wide
accesses only at even addresses. The card
configuration registers are also located here.
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 4-12 below for
signal states and bus validity for the Attribute
Memory function.
Table 4-12 Attribute Memory Function
Function Mode -REG -CE2 -CE1 A9 A0 -OE -WE D15-D8 D7-D0
Standby Mode X H H X X X X High Z High Z
Read Byte Access
CIS ROM (8 bits)
L H L L L L H High Z Even Byte
Write Byte Access
CIS (8 bits) (Invalid)
L H L L L H L Don't Care Even Byte
Read Byte Access
Configuration (8 bits)
L H L H L L H High Z Even Byte
Write Byte Access
Configuration (8 bits)
L H L H L H L Don't Care Even Byte
Read Word Access
CIS (16 bits)
L L L L X L H Not Valid Even Byte
Write Word Access
CIS (16 bits) (Invalid)
L L L L X H L Don't Care Even Byte
Read Word Access
Configuration (16 bits)
L L L H X L H Not Valid Even Byte
Write Word Access
Configuration (16 bits)
L L L H X H L Don't Care Even Byte
Note: The -CE signal or both the -OE signal and the -WE signal must be de-asserted between consecutive cycle
operations.

SanDisk CompactFlash Specifications

General

Brand	SanDisk
Model	CompactFlash
Category	Storage
Language	English