参数资料
型号: IDT70T631S
厂商: Integrated Device Technology, Inc.
英文描述: 122 x 32 pixel format, Compact LCD size
中文描述: 高速2.5V的512/256K与3.3V 5011 2.5V的接口× 18 ASYNCHRONO美国双端口静态RAM
文件页数: 7/27页
文件大小: 342K
代理商: IDT70T631S
7
IDT70T633/1S
High-Speed 2.5V 512/256K x 18 Asynchronous Dual-Port Static RAM Industrial and Commercial Temperature Ranges
Truth Table I—Read/Write and Enable Control
(1)
Preliminary
NOTE:
1. "H" = V
IH,
"L" = V
IL,
"X" = Don't Care.
OE
SEM
CE
0
CE
1
UB
LB
R/
W
ZZ
Upper Byte
I/O
9-17
Lower Byte
I/O
0-8
MODE
X
H
H
X
X
X
X
L
High-Z
High-Z
Deselected–Power Down
X
H
X
L
X
X
X
L
High-Z
High-Z
Deselected–Power Down
X
H
L
H
H
H
X
L
High-Z
High-Z
Both Bytes Deselected
X
H
L
H
H
L
L
L
High-Z
D
IN
Write to Lower Byte
X
H
L
H
L
H
L
L
D
IN
High-Z
Write to Upper Byte
X
H
L
H
L
L
L
L
D
IN
D
IN
Write to Both Bytes
L
H
L
H
H
L
H
L
High-Z
D
OUT
Read Lower Byte
L
H
L
H
L
H
H
L
D
OUT
High-Z
Read Upper Byte
L
H
L
H
L
L
H
L
D
OUT
D
OUT
Read Both Bytes
H
H
L
H
L
L
X
L
High-Z
High-Z
Outputs Disabled
X
X
X
X
X
X
X
H
High-Z
High-Z
High-Z Sleep Mode
5670 tbl 02
Truth Table II – Semaphore Read/Write Control
(1)
Inputs
(1)
NOTES:
1. There are eight semaphore flags written to I/O
0
and read from all the I/Os (I/O
0
-I/O
17
). These eight semaphore flags are addressed by A
0
-A
2
.
2.
CE
= L occurs when
CE
0
= V
IL
and CE
1
= V
IH
.
CE
= H when
CE
0
= V
IH
and/or CE
1
= V
IL
.
3. Each byte is controlled by the respective
UB
and
LB
. To read data
UB
and/or
LB
= V
IL
.
Outputs
Mode
CE
(2)
R/
W
OE
UB
LB
SEM
I/O
1-17
I/O
0
H
H
L
L
L
L
DATA
OUT
DATA
OUT
Read Data in Semaphore Flag
(3)
H
X
X
L
L
X
DATA
IN
Write I/O
0
into Semaphore Flag
L
X
X
X
X
L
______
______
Not Allowed
5670 tbl 03
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