SDP3B FlashDisk Product Manual
SanDisk SDP3B FlashDisk Product Manual © 1998 SANDISK CORPORATION
44
4.6
Common Memory Transfer Function
4.6.1
Common Memory Function
The Common Memory transfer to or from the
SDP3B FlashDisk can be either 8 or 16 bits.
The SDP3B FlashDisk permits both 8 and 16 bit
accesses to all of its Common Memory addresses.
The SDP3B FlashDisk 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
- R E G
- C E 2
- C E 1
A0
- O E
- W E
D15-D8
D7-D0
Standby Mode
X
H
H
X
X
X
High Z
High Z
Byte ReadAccess
(8 bits)
H
H
H
H
L
L
L
H
L
L
H
H
High Z
High Z
Even-Byte
Odd-Byte
Byte Write Access
(8 bits)
H
H
H
H
L
L
L
H
H
H
L
L
Don’t Care
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
