IDT70V24 IDT [Integrated Device Technology], IDT70V24 Datasheet - Page 18

• Manufacturer Part Number: IDT70V24
• Description: HIGH-SPEED 3.3V 4K x 16 DUAL-PORT STATIC RAM
• Manufacturer: IDT [Integrated Device Technology]

NOTES:
1. Assumes BUSY
2. If BUSY
3. If BUSY
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
NOTES:
1. This table denotes a sequence of events for only one of the eight semaphores on the IDT70V24.
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
IDT70V24S/L
High-Speed 4K x 16 Dual-Port Static RAM
X
X
H
L
R/W
pull, not open drain outputs. On slaves the BUSY input internally inhibits writes.
enable inputs of this port. If t
BUSY
L
X
X
X
L
L
R
CE
IH
L
R
X
X
H
L
outputs are driving LOW regardless of actual logic level on the pin.
, SEM = V
= V
R
= V
Inputs
L
and BUSY
IL
IL
CE
, then no change.
Functions
, then no change.
X
X
L
L
L
NO MATCH
L
A
= BUSY
A
MATCH
MATCH
MATCH
0R
IL
0L
-A
-A
to access the semaphores. Refer to the Semaphore Read/Write Control Truth Table.
R
11L
11R
are both outputs when the part is configured as a master. Both are inputs when configured as a slave. BUSY outputs on the IDT70V24 are push
Left Port
R
OE
= V
X
X
X
L
APS
L
IH
is not met, either BUSY
.
BUSY
(2)
H
H
H
A
L
11L
Outputs
(1)
FFF
FFE
X
X
-A
0L
BUSY
D
0
0
and read from all I/O's (I/O
(2)
H
H
H
- D
L
R
outputs are driving LOW regardless of actual logic level on the pin. Writes to the right port are internally ignored when
(1)
1
0
0
1
1
0
1
1
1
0
1
INT
L
15
X
X
H
or BUSY
L
Left
(3)
(2)
BUSY
L
Write Inhibit
Function
Normal
Normal
Normal
R
= LOW will result. BUSY
R/W
X
X
X
2911 tbl 16
L
D
0
R
(3)
- D
0
15
1
1
1
0
0
1
1
0
1
1
1
-I/O
6.42
Right
18
15
CE
X
X
L
L
). These eight semaphores are addressed by A
R
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
L
and BUSY
Right Port
OE
X
L
X
X
IH
R
if the inputs to the opposite port became stable after the address and
Industrial and Commercial Temperature Ranges
R
outputs cannot be LOW simultaneously.
A
11R
FFF
FFE
X
X
-A
0R
Status
INT
H
L
X
X
(2)
(3)
R
0
-A
2
.
Set Right INT
Reset Right INT
Set Left INT
Reset Left INT
Function
L
R
Flag
L
Flag
R
Flag
Flag
2911 tbl 15
2911 tbl 17