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參數(shù)資料
| 型號： | 70V34S20PFGI |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | SRAM |
| 英文描述： | 4K X 18 DUAL-PORT SRAM, 20 ns, PQFP100 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, GREEN, PLASTIC, TQFP-100 |
| 文件頁數(shù)： | 22/25頁 |
| 文件大小： | 211K |
| 代理商： | 70V34S20PFGI |
6.42
IDT70V35/34S/L
(IDT70V25/24S/L)
High-Speed 3.3V 8/4K x 18 (8/4K x 16) Dual-Port Static RAM
Industrial and Commercial Temperature Ranges
6
1.
A12 is a NC for IDT70V34 and for IDT70V24.
2. I/O0x - I/O15x for IDT70V25/24.
3. Upper Byte Select controls pins 9-17 for IDT70V35/34 and controls pins 8-15
for IDT70V25/24.
4. Lower Byte Select controls pins 0-8 for IDT70V35/34 and controls pins 0-7
for IDT70V25/24.
NOTES:
Left Port
Right Port
Names
CEL
CER
Chip Enable
R/
WL
R/
WR
Read/Write Enable
OEL
OER
Output Enable
A0L - A12L(1)
A0R - A12R(1)
Address
I/O0L - I/O17L(2)
I/O0R - I/O17R(2)
Data Input/Output
SEML
SEMR
Semaphore Enable
UBL
UBR
Upper Byte Select(3)
LBL
LBR
Lower Byte Select
(4)
INTL
INTR
Interrupt Flag
BUSYL
BUSYR
Busy Flag
M/
S
Master or Slave Select
VDD
Power (3.3V)
VSS
Ground (0V)
5624 tbl 01
Pin Names
Truth Table II: Semaphore Read/Write Control(1)
NOTE:
1. There are eight semaphore flags written to via I/O0 and read from all of the I/O's (I/O0-I/O17 for IDT70V35/34) and (I/O0-I/O15 for IDT70V25/24). These eight semaphores
are addressed by A0-A2.
Truth Table I: Non-Contention Read/Write Control
NOTES:
1. A0L-A12L
≠ A0R-A12R for IDT70V35/34 and A0L-A11L ≠ A0R-A11R for IDT70V25/24.
2. Outputs for IDT70V25/24 are I/O0x-I/O7x.
3. Outputs for IDT70V25/24 are I/O8x-I/O15x.
Inputs
(1)
Outputs
Mode
CE
R/
W
OE
UB
LB
SEM
I/O9-17
(3)
I/O0-8
(2)
H
X
H
High-Z
Deselected: Power Down
X
H
High-Z
Both Bytes Deselected
LL
X
L
H
DATAIN
High-Z
Write to Upper Byte Only
L
X
H
L
H
High-Z
DATAIN
Write to Lower Byte Only
LL
X
L
H
DATAIN
Write to Both Bytes
LH
LLH
H
DATAOUT
High-Z
Read Upper Byte Only
L
H
LH
High-Z
DATAOUT
Read Lower Byte Only
LH
LL
L
H
DATAOUT
Read Both Bytes
XXH
XX
X
High-Z
Outputs Disabled
5624 tbl 02
Inputs
Outputs
Mode
CE
R/
W
OE
UB
LB
SEM
I/O9-17
(1)
I/O0-8
(1)
HH
L
X
L
DATAOUT
Read Data in Semaphore Flag
X
H
L
HHL
DATAOUT
Read Data in Semaphore Flag
H
↑
XXX
L
DATAIN
Write I/O0 into Semaphore Flag
X
↑
X
HHL
DATAIN
Write I/O0 into Semaphore Flag
LX
X
L
XL
____
Not Allowed
LX
X
L
____
Not Allowed
5624 tbl 03
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