IDT70T633 Integrated Device Technology, IDT70T633 Datasheet - Page 7

• Manufacturer Part Number: IDT70T633
• Description: 512k X 18, 3.3v/2.5v Dual-port Ram, Interleaved I/o
• Manufacturer: Integrated Device Technology

Truth Table I—Read/Write and Enable Control
Truth Table II – Semaphore Read/Write Control
NOTES:
1. There are eight semaphore flags written to I/O
2. CE = L occurs when CE
3. Each byte is controlled by the respective UB and LB. To read data UB and/or LB = V
NOTE:
1. "H" = V
IDT70T633/1S
High-Speed 2.5V 512/256K x 18 Asynchronous Dual-Port Static RAM
CE
OE
X
X
X
X
X
X
H
X
L
L
L
H
H
L
(2)
IH,
SEM
"L" = V
R/W
X
H
H
H
H
H
H
H
H
H
H
↑
X
H
IL,
"X" = Don't Care.
CE
H
X
X
L
L
L
L
L
L
L
L
OE
0
X
X
L
0
Inputs
= V
IL
CE
X
X
L
H
H
H
H
H
H
H
H
and CE
(1)
UB
1
X
X
L
1
UB
= V
X
X
H
H
L
L
H
L
L
L
X
LB
IH
X
L
L
. CE = H when CE
0
and read from all the I/Os (I/O
LB
X
X
X
H
L
H
L
L
H
L
L
SEM
L
L
L
R/W
X
X
X
H
H
H
X
X
L
L
L
0
DATA
= V
I/O
______
X
IH
1-17
OUT
ZZ
H
and/or CE
L
L
L
L
L
L
L
L
L
L
Outputs
7
0
-I/O
Upper Byte
DATA
DATA
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
1
I/O
High-Z
17
D
D
______
I/O
D
D
= V
OUT
OUT
). These eight semaphore flags are addressed by A
9-17
IN
IN
IL
0
OUT
.
IN
IL
.
Read Data in Semaphore Flag
Not Allowed
Write I/O
Lower Byte
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
I/O
D
D
(1)
D
D
OUT
OUT
IN
IN
0-8
Industrial and Commercial Temperature Ranges
(1)
0
into Semaphore Flag
Deselected–Power Down
Deselected–Power Down
Both Bytes Deselected
Read Lower Byte
Read Upper Byte
Read Both Bytes
Outputs Disabled
High-Z Sleep Mode
Write to Lower Byte
Write to Upper Byte
Write to Both Bytes
Mode
(3)
MODE
0
-A
2
.
5670 tbl 02
5670 tbl 03