SanDisk SDDR-01 - ImageMate External Parallel CompactFlash Card Reader Manual descarregar pdf (Página 42)

CompactFlash Memory Card Product Manual Preliminary

4.6 Common Memory Transfer Function

4.6.1 Common Memory Function

The Common Memory transfer to or from the

CompactFlash Memory Card can be either 8 or 16

bits.

The CompactFlash Memory Card permits both 8

and 16 bit accesses to all of its Common Memory

addresses.

The CompactFlash Memory Card may request the

host to extend the length of a memory write cycle

or extend the length of a memory read cycle until

data is ready by asserting the -WAIT signal at the

start of the cycle.

Table 4-16 Common Memory Function

Function Code -REG -CE2 -CE1 A0 -OE -WE D15-D8 D7-D0

Standby Mode X H H X X X High Z High Z

Byte ReadAccess

(8 bits)

High Z

Even-Byte

Odd-Byte

Byte Write Access

(8 bits)

Don't Care

Even-Byte

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 Don't Care

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 117 118

Sem comentários

SanDisk SDDR-01 - ImageMate External Parallel CompactFlash Card Reader Manual Página 42