SanDisk CompactFlash Extreme III User Manual
Page 40
Interface Description
SanDisk CompactFlash Card OEM Product Manual
Decoding for the configuration registers is defined in Table 3-18.
Table 3-18
Configuration Registers Decoding
-CE2
X
-CE1
0
-REG
0
-OE
0
-WE
1
A10
0
A9
1
A8-
A4
00
A3
0
A2
0
A1
0
A0
0
Selected Register
Configuration Option Read
X
0
0
1
0
0
1
00
0
0
0
0
Configuration Option Write
X
0
0
0
1
0
1
00
0
0
1
0
Card Status Read
X
0
0
1
0
0
1
00
0
0
1
0
Card Status Write
X
0
0
0
1
0
1
00
0
1
0
0
Pin Replacement Read
X
0
0
1
0
0
1
00
0
1
0
0
Pin Replacement Write
X
0
0
0
1
0
1
00
0
1
1
0
Socket and Copy Read
X
0
0
1
0
0
1
00
0
1
1
0
Socket and Copy Write
3.4.1
Attribute Memory Function
Attribute Memory is a space where a 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 there.
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 3-19 for signal states and bus validity for the
Attribute Memory function.
NOTE
: The -CE signal or both the -OE and -WE signal must be de-asserted
between consecutive cycle operaitons.
Table 3-19
Attribute Memory Function
Function Mode
-REG
-CE2
-CE1
A9
A0
-OE
-WE
D15-D8
D7-D0
Standby 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
02/07, Rev. 12.0
3-22
© 2007 SanDisk Corporation