SanDisk CompactFlash Extreme III - Manual (Page 43)

SanDisk CompactFlash Card OEM Product Manual Interface Description
Pin replacement changed bit/mask values are contained in Table 3-21.
Table 3-21 Pin Replacement Changed Bit/Mask Bit Values
Written by Host
Initial Value of
(C) Status “C” Bit “M” Bit Final “C” Bit Comments
0 X 0 0 Unchanged
1 X 0 1 Unchanged
X 0 1 0 Cleared by host
X 1 1 1 Set by host
3.4.5 Socket and Copy Register (Address 206h in Attribute Memory)
This register contains additional configuration information. This register is always written by
the system before writing the card's Configuration Index Register.
Operation D7 D6 D5 D4 D3 D2 D1 D0
Read Reserved 0 0 Drive# 0 0 0 0
Write 0 0 0 Drive# (0) X X X X
Bit
D7
D4
D3-D0
(write)
Name
Reserved
Drive#
X
Description
This bit is reserved for future standardization. This bit must be set to "0" by
the software when the register is written.
This bit indicates the drive number of the card if twin card configuration is
supported.
The socket number is ignored by the card.
3.5 I/O Transfer Function
The following sections provide valuable information for the I/O Transfer function.
3.5.1 Common Memory Function
The Common Memory transfer to or from SanDisk CompactFlash memory cards can be either
8 or 16 bits. The card permits both 8- and 16-bit accesses to all of its Common Memory
addresses.
Table 3-22 Common Memory Function
Function Code -REG -CE2 -CE1 A0 -OE -WE D15-D8 D7-D0
Standby X H H X X X High Z High Z
Byte Read Access H H L L L H High Z Even Byte
(8 bits)
H H L H L H High Z Odd Byte
Byte Write Access H H L L H L Don’t Care Even Byte
(8 bits)
H H L H H L Don’t Care Odd Byte
© 2007 SanDisk Corporation 3-25 Rev. 12.0, 02/07