IDT70V27 Integrated Device Technology, IDT70V27 Datasheet - Page 4

• Manufacturer Part Number: IDT70V27
• Description: 32k X 16 3.3v Dual-port Ram
• Manufacturer: Integrated Device Technology

Truth Table I – Chip Enable
NOTES:
1. Chip Enable references are shown above with the actual CE
2. Port "A" and "B" references are located where CE is used.
3. "H" = V
Truth Table II – Non-Contention Read/Write Control
NOTES:
1. A
2. Refer to Chip Enable Truth Table.
Truth Table III – Semaphore Read/Write Control
NOTES:
1. There are eight semaphore flags written to I/O
2. Refer to Chip Enable Truth Table.
IDT 70V27S/L
High-Speed 3.3V 32K x 16 Dual-Port Static RAM
CE
CE
0L
H
X
X
H
X
H
X
L
L
L
L
L
L
L
L
(2)
(2)
— A
IH
CE
L
H
14L
and "L" = V
≠ A
R/W
R/W
↑
↑
X
X
H
H
H
X
H
H
X
X
L
L
L
0R
— A
IL
14R.
OE
OE
X
X
X
X
X
H
X
X
X
X
>V
L
L
L
L
L
< 0.2V
Inputs
Inputs
DD
CE
V
V
X
X
IH
IL
-0.2V
0
(1)
(1)
UB
UB
X
H
H
H
X
X
H
X
H
X
L
L
L
L
L
0
and read from all the I/Os (I/O
LB
LB
(1,2,3)
X
H
H
H
X
X
H
X
H
X
L
L
L
L
L
>V
<0.2V
DD
CE
V
V
0
X
X
IH
IL
and CE
-0.2V
1
SEM
SEM
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
1
levels, CE is a reference only.
4
0
-I/O
Port Selected (TTL Active)
Port Selected (CMOS Active)
Port Deselected (TTL Inactive)
Port Deselected (TTL Inactive)
Port Deselected (CMOS Inactive)
Port Deselected (CMOS Inactive)
DATA
DATA
DATA
DATA
DATA
DATA
DATA
DATA
High-Z
High-Z
High-Z
High-Z
High-Z
I/O
I/O
15
______
______
). These eight semaphore flags are addressed by A
8-15
8-15
OUT
OUT
OUT
OUT
IN
IN
IN
IN
Outputs
Outputs
Commercial and Industrial Temperature Range
DATA
DATA
DATA
DATA
DATA
DATA
DATA
DATA
High-Z
High-Z
High-Z
High-Z
High-Z
I/O
I/O
______
______
0-7
0-7
OUT
OUT
OUT
OUT
IN
IN
IN
IN
Deselected: Power-Down
Both Bytes Deselected
Read Upper Byte Only
Read Lower Byte Only
Read Both Bytes
Outputs Disabled
Read Data in Semaphore Flag
Read Data in Semaphore Flag
Not Allowed
Not Allowed
Write to Upper Byte Only
Write to Lower Byte Only
Write to Both Bytes
Write I/O
Write I/O
Mode
0
0
into Semaphore Flag
into Semaphore Flag
Mode
Mode
0
-A
2
.
3603 tbl 03
3603 tbl 02
3603 tbl 04