Sandisk CompactFlash Extreme III User Manual download pdf (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” 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

D3-D0

(write)

Name

Reserved

Drive#

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

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 107 108

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Sandisk CompactFlash Extreme III User Manual Page 43

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