Transcend CompactFlash 400X - Common Memory Transfer Function

T
T
T
S
S
S
1
1
1
6
6
6
G
G
G
~
~
~
6
6
6
4
4
4
G
G
G
C
C
C
F
F
F
4
4
4
0
0
0
0
0
0
400X CompactFlash Card
Transcend Information Inc.
V1.0
47
Common Memory Transfer Function
The Common Memory transfer to or from the CompactFlash Storage can be either 8 or 16 bits.
Function Code DMA -REG
-CE2
-CE1
A0
-OE
-WE
D15-D8 D7-D0
Standby Mode None X H H X
X X High Z High Z
Byte Read (8 bits)
Don’t
Care
H
H
H
H
L
L
L
H
L
L
H
H
High Z
High Z
Even-Byte
Odd-Byte
Byte Write (8 bits)
Don’t
Care
H
H
H
H
L
L
L
H
H
H
L
L
Don’t Care
Don’t Care
Even-Byte
Odd-Byte
Word Read (16 bits)
Don’t
Care
H L L X
L H Odd-Byte
Even-Byte
Word Write (16 bits)
Don’t
Care
H L L X
H L Odd-Byte
Even-Byte
Odd Byte Read Only (8 bits)
Don’t
Care
H L H X
L H Odd-Byte
High Z
Odd Byte Write Only (8 bits)
Don’t
Care
H L H X
H L Odd-Byte
Don’t Care
Ultra DMA Write Write L H H X
H H Odd-Byte
Even-Byte
Ultra DMA Read Read L H H X
H H Odd-Byte
Even-Byte
Table: Common Memory Function