SanDisk SDCFRX4-2048-901 Product Manual - Page 40
Table 3-18, Configuration Registers Decoding, Table 3-19, Attribute Memory Function
UPC - 619659028954
View all SanDisk SDCFRX4-2048-901 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 40 highlights
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