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 FunctionFunction 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