SanDisk SDCFH-004G Product Manual - Page 40

Table 3-18, Configuration Registers Decoding, Table 3-19, Attribute Memory Function

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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 A8-CE2 -CE1 -REG -OE -WE A10 A9 A4 A3 A2 A1 A0 Selected Register X 0 0 0 1 0 1 00 0 0 0 0 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 L H L L L L H High Z Even (8 bits) Byte Write Byte Access CIS (8 bits) L H L L L H L Don't Even (Invalid) Care 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 Even Care 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 Even Care 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 Even Care Byte 02/07, Rev. 12.0 3-22 © 2007 SanDisk Corporation

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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