SDP3B FlashDisk Product Manual
SanDisk SDP3B FlashDisk Product Manual © 1998 SANDISK CORPORATION
39
4.4.1
Attribute Memory Function
Attribute memory is a space where SDP3B
FlashDisk 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
- R E G
- C E 2
- C E 1
A9
A0
- O E
- W E
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.