IDT70V25L25PFGI8 IDT, Integrated Device Technology Inc, IDT70V25L25PFGI8 Datasheet - Page 21

• Manufacturer Part Number: IDT70V25L25PFGI8
• Description: IC SRAM 128KBIT 25NS 100TQFP
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT70V25L25PFGI8

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 128K (8K x 16)
• Speed: 25ns
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 70V25L25PFGI8

NOTES:
1. Assumes BUSY
2. If BUSY
3. If BUSY
4. A
Truth Table III — Interrupt Flag
Truth Table IV — Address BUSY
Arbitration
NOTES:
1. Pins BUSY
2. L if the inputs to the opposite port were stable prior to the address and enable inputs of this port. V
3. Writes to the left port are internally ignored when BUSY
4. A
Truth Table V — Example of Semaphore Procurement Sequence
NOTES:
1. This table denotes a sequence of events for only one of the eight semaphores on the IDT70V35/34 (IDT70V25/24).
2. There are eight semaphore flags written to via I/O
3. CE = V
No Action
Left Port Writes "0" to Semaphore
Right Port Writes "0" to Semaphore
Left Port Writes "1" to Semaphore
Left Port Writes "0" to Semaphore
Right Port Writes "1" to Semaphore
Left Port Writes "1" to Semaphore
Right Port Writes "0" to Semaphore
Right Port Writes "1" to Semaphore
Left Port Writes "0" to Semaphore
Left Port Writes "1" to Semaphore
CE
IDT70V35/34S/L (IDT70V25/24S/L)
High-Speed 3.3V 8/4K x 18 (8/4K x 16) Dual-Port Static RAM
X
H
X
L
R/W
IDT70V35/34 (IDT70V25/24) are push pull, not open drain outputs. On slaves the BUSY input internally inhibits writes.
address and enable inputs of this port. If t
ignored when BUSY
are addressed by A
L
12
X
X
X
12
L
L
is a NC for IDT70V34 and for IDT70V24, therefore Interrupt Addresses are FFF and FFE.
is a NC for IDT70V34 and for IDT70V24. Address comparison will be for A
CE
X
X
H
L
IH
L
R
R
, SEM = V
Inputs
= V
= V
L
and BUSY
CE
IL
IL
Functions
X
X
L
L
, then no change.
, then no change.
NO MATCH
A
L
L
A
12L
MATCH
MATCH
MATCH
= BUSY
12R
-A
IL
R
0
-A
-A
0L
outputs are driving LOW regardless of actual logic level on the pin.
to access the semaphores. Refer to the Semaphore Read/Write Control Truth Tables.
0R
R
2
(4)
.
Left Port
are both outputs when the part is configured as a master. Both are inputs when configured as a slave. BUSY outputs on the
R
OE
X
X
X
L
= V
L
IH
BUSY
.
Note
H
H
H
A
12L
L
(2)
1FFF
1FFE
Outputs
(1)
-A
X
X
APS
0L
(4)
(4)
(4)
BUSY
is not met, either BUSY
D
Note
0
H
H
H
- D
0
R
(2)
and read from all I/O's (I/O
(1)
17
1
0
1
1
1
1
1
1
INT
0
0
0
X
X
L
H
L
Left
(3)
(2)
L
outputs are driving LOW regardless of actual logic level on the pin. Writes to the right port are internally
Write Inhibit
(2)
Function
Normal
Normal
Normal
R/W
5624 tbl 16
D
(1)
X
X
X
L
0
L
R
- D
or BUSY
(3)
17
1
1
1
1
1
1
1
1
0
0
0
6.42
Right
21
0
CE
0
-I/O
R
X
X
L
L
- A
= LOW will result. BUSY
R
(2)
17
11
for IDT70V35/34) and (I/O
.
Semaphore free
Left port has semaphore token
No change. Right side has no write access to semaphore
Right port obtains semaphore token
No change. Left port has no write access to semaphore
Left port obtains semaphore token
Semaphore free
Right port has semaphore token
Semaphore free
Left port has semaphore token
Semaphore free
Right Port
OE
X
X
X
L
R
IH
Industrial and Commercial Temperature Ranges
if the inputs to the opposite port became stable after the
A
12R
1FFF
1FFE
L
-A
X
X
and BUSY
0R
(4)
(4)
0
(4)
-I/O
15
R
for IDT70V25/24). These eight semaphores
outputs cannot be LOW simultaneously.
INT
Status
H
X
X
L
(2)
(3)
R
Set Right INT
Reset Right INT
Set Left INT
Reset Left INT
(1,2,3)
Function
L
R
Flag
L
Flag
R
Flag
Flag
5624 tbl 17
5624 tbl 15