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參數(shù)資料
| 型號： | IDT70V25L20PFI |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | DRAM |
| 英文描述： | HIGH-SPEED 3.3V 8K x 16 DUAL-PORT STATIC RAM |
| 中文描述： | 8K X 16 DUAL-PORT SRAM, 20 ns, PQFP100 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, TQFP-100 |
| 文件頁數(shù)： | 18/22頁 |
| 文件大小： | 186K |
| 代理商： | IDT70V25L20PFI |
6.42
IDT70V25S/L
High-Speed 8K x 16 Dual-Port Static RAM Industrial and Commercial Temperature Ranges
18
$%$&'2A++
&
BUSY
NOTES:
1.
Pins
BUSY
L
and
BUSY
R
are both outputs when the part is configured as a master. Both are inputs when configured as a slave.
BUSY
outputs on the IDT70V25 are
push pull, not open drain outputs. On slaves the
BUSY
input internally inhibits writes.
L if the inputs to the opposite port were stable prior to the address and enable inputs of this port. V
IH
if the inputs to the opposite port became stable after the address
and enable inputs of this port. If t
APS
is not met, either
BUSY
L
or
BUSY
R
= LOW will result.
BUSY
L
and
BUSY
R
outputs cannot be LOW simultaneously.
Writes to the left port are internally ignored when
BUSY
L
outputs are driving LOW regardless of actual logic level on the pin. Writes to the right port are internally ignored
when
BUSY
R
outputs are driving LOW regardless of actual logic level on the pin.
2.
3.
$%$&2A9/.%.B
NOTES:
1.
2.
3.
This table denotes a sequence of events for only one of the eight semaphores on the IDT70V25.
There are eight semaphore flags written to via I/O
0
and read fromall I/O's (I/O
0
-I/O
15
). These eight semaphores are addressed by A
0
-A
2
.
CE
= V
IH
,
SEM
= V
IL
to access the semaphores. Refer to the Semaphore Read/Write Control Truth Tables.
$%$&'''A'
NOTES:
1.
2.
3.
Assumes
BUSY
L
=
BUSY
R
= V
IH
.
If
BUSY
L
= V
IL
, then no change.
If
BUSY
R
= V
IL
, then no change.
Left Port
Right Port
Function
R/
W
L
CE
L
OE
L
A
12L
-A
0L
INT
L
R/
W
R
CE
R
OE
R
A
12R
-A
0R
INT
R
L
L
X
1FFF
X
X
X
X
X
L
(2)
Set Right
INT
R
Flag
X
X
X
X
X
X
L
L
1FFF
H
(3)
Reset Right
INT
R
Flag
X
X
X
X
L
(3)
L
L
X
1FFE
X
Set Left
INT
L
Flag
X
L
L
1FFE
H
(2)
X
X
X
X
X
Reset Left
INT
L
Flag
2944 tbl 15
Inputs
Outputs
Function
CE
L
CE
R
A
12L
-A
0L
A
12R
-A
0R
BUSY
L
(1)
BUSY
R
(1)
X
X
NO MATCH
H
H
Normal
H
X
MATCH
H
H
Normal
X
H
MATCH
H
H
Normal
L
L
MATCH
(2)
(2)
Write Inhibit
(3)
2944 tbl 16
Functions
D
0
- D
15
Left
D
0
- D
15
Right
Status
No Action
1
1
Semaphore free
Left Port Writes "0" to Semaphore
0
1
Left port has semaphore token
Right Port Writes "0" to Semaphore
0
1
No change. Right side has no write access to semaphore
Left Port Writes "1" to Semaphore
1
0
Right port obtains semaphore token
Left Port Writes "0" to Semaphore
1
0
No change. Left port has no write access to semaphore
Right Port Writes "1" to Semaphore
0
1
Left port obtains semaphore token
Left Port Writes "1" to Semaphore
1
1
Semaphore free
Right Port Writes "0" to Semaphore
1
0
Right port has semaphore token
Right Port Writes "1" to Semaphore
1
1
Semaphore free
Left Port Writes "0" to Semaphore
0
1
Left port has semaphore token
Left Port Writes "1" to Semaphore
1
1
Semaphore free
2944 tbl 17
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