
September 15, 2005 S71WS-N_01_A4
S71WS-Nx0 Based MCPs
105
A d v a n c e I n f o r m a t i o n
21 Functional Description
Table 21.1 Asynchronous 4 Page Read & Asynchronous Write Mode (A15/A14=0/0)
Legend:
X = Don’t care (must be low or high state).
Notes:
1.
In asynchronous mode, Clock and ADV# are ignored.
2.
The WAIT# pin is High-Z in asynchronous mode.
Table 21.2 Synchronous Burst Read & Asynchronous Write Mode (A15/A14=0/1)
Notes:
1.
2.
3.
X must be low or high state.
X means
Don’t care
(can be low, high or toggling).
WAIT# is the device output signal and does not have any affect on the mode definition. Please refer to each timing
diagram for Wait# pin function.
Mode
CS#
H
H
L
L
L
L
L
L
L
L
L
MRS#
H
L
H
H
H
H
H
H
H
H
L
OE#
X
X
H
X
L
L
L
H
H
H
H
WE#
X
X
H
X
H
H
H
L
L
L
L
LB#
X
X
X
H
L
H
L
L
H
L
L
UB#
X
X
X
H
H
L
L
H
L
L
L
I/O
0-7
High-Z
High-Z
High-Z
High-Z
D
OUT
High-Z
D
OUT
D
IN
High-Z
D
IN
High-Z
I/O
8-15
High-Z
High-Z
High-Z
High-Z
High-Z
D
OUT
D
OUT
High-Z
D
IN
D
IN
High-Z
Power
Standby
PAR
Active
Active
Active
Active
Active
Active
Active
Active
Active
Deselected
Deselected
Output Disabled
Outputs Disabled
Lower Byte Read
Upper Byte Read
Word Read
Lower Byte Write
Upper Byte Write
Word Write
Mode Register Set
Mode
CS#
MRS#
OE#
X
WE#
X
(
Note 1
)
X
(
Note 1
)
LB#
X
UB#
X
I/O
0-7
High-
Z
High-
Z
High-
Z
High-
Z
I/O
8-15
High-
Z
High-
Z
High-
Z
High-
Z
CLK
X
(note 2)
X
(note 2)
X
(note 2)
X
(note 2)
ADV#
X
(note 2)
X
(note 2)
Power
Deselected
H
H
(
Note 1
)
X
(
Note 1
)
(
Note 1
)
X
(
Note 1
)
X
(
Note 1
)
(
Note 1
)
X
(
Note 1
)
X
(
Note 1
)
Standby
Deselected
H
L
PAR
Output
Disabled
Outputs
Disabled
L
H
H
H
H
Active
L
H
X
(
Note 1
)
X
(
Note 1
)
H
H
H
Active
Read
Command
L
H
X
(
Note 1
)
H
X
(
Note 1
)
X
(
Note 1
)
High-
Z
High-
Z
Active
Lower Byte
Read
L
H
L
H
L
H
D
OUT
High-
Z
H
Active
Upper Byte
Read
L
H
L
H
H
L
High-
Z
D
OUT
H
Active
Word Read
L
H
L
H
L
L
D
OUT
D
OUT
H
Active
Lower Byte
Write
L
H
H
L
L
H
D
IN
High-
Z
X
(note 2)
Active
Upper Byte
Write
L
H
H
L
H
L
High-
Z
D
IN
X
(note 2)
Active
Word Write
L
H
H
L
L
L
D
IN
D
IN
X
(note 2)
Active
Mode
Register
Set
L
L
H
L
L
L
High-
Z
High-
Z
X
(note 2)
Active
or
or
or
or