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SanDisk Industrial Grade CompactFlash 5000 Product Manual

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 access to

all its Common Memory addresses.

Table 28: 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 Irrelevant Even Byte

(8 bits) H H L H H L Irrelevant Odd Byte

Word Read

Access (16 bits)

H L L X L H Odd Byte Even Byte

Word Write

Access (16 bits)

H L L X H L Odd Byte Even Byte

Odd Byte Read

Only (8 bits)

H L H X L H Odd Byte High Z

Odd Byte Write

Only (8 bits)

H L H X H L Odd Byte Irrelevant

3.6 True IDE Mode I/O Transfer Function

This section contains valuable information on the True IDE Mode I/O Transfer

function.

3.6.1

True IDE Mode I/O Function

SanDisk CompactFlash Memory cards can be configured in a True IDE Mode of

operation. Cards are configured in this mode only when the -OE input signal is

grounded by the host when power is applied to the cards. In this True IDE

Mode, the PCMCIA protocol and configuration are disabled and only I/O

operations to the Task File and Data Register are allowed. In this mode, no

Memory or Attribute registers are accessible to the host. CompactFlash cards

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 96 97

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