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4.4.1
Attribute Memory Function
Attribute memory is a space where SDP3B
FlashDisk
identification
information is stored, and is limited to 8-bit wide
accesses only at even addresses.
configuration registers are also located here.
For the Attribute Memory Read function, signals
-REG and -OE must be active and -WE inactive
Table 4-12 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.
SanDisk SDP3B FlashDisk Product Manual © 1998 SANDISK CORPORATION
and
configuration
The
card
-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
SDP3B FlashDisk Product Manual
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.
A9
A0
- O E
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
-WE
D15-D8
D7-D0
X
High Z
High Z
H
High Z
Even Byte
L
Don't Care
Even Byte
H
High Z
Even Byte
L
Don't Care
Even Byte
H
Not Valid
Even Byte
L
Don't Care
Even Byte
H
Not Valid
Even Byte
L
Don't Care
Even Byte
39
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