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| 型号： | IDT70V07S25J |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC SRAM 256KBIT 25NS 68PLCC |
| 标准包装： | 18 |
| 格式 - 存储器： | RAM |
| 存储器类型： | SRAM - 双端口，异步 |
| 存储容量： | 256K (32K x 8) |
| 速度： | 25ns |
| 接口： | 并联 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 68-LCC（J 形引线） |
| 供应商设备封装： | 68-PLCC（24x24） |
| 包装： | 管件 |
| 其它名称： | 70V07S25J |
IDT70V07S/L
High-Speed 32K x 8 Dual-Port Static RAM
Truth Table III — Interrupt Flag (1)
Left Port
Industrial and Commercial Temperature Ranges
Right Port
L
H
L
H
R/ W L
L
X
X
X
CE L
L
X
X
L
OE L
X
X
X
L
A 14L -A 0L
7FFF
X
X
7FFE
INT L
X
X
(3)
(2)
R/ W R
X
X
L
X
CE R
X
L
L
X
OE R
X
L
X
X
A 14R -A 0R
X
7FFF
7FFE
X
INT R
(2)
(3)
X
X
Function
Set Right INT R Flag
Reset Right INT R Flag
Set Left INT L Flag
Reset Left INT L Flag
NOTES:
1. Assumes BUSY L = BUSY R =V IH .
2. If BUSY L = V IL , then no change.
3. If BUSY R = V IL , then no change.
Truth Table IV — Address BUSY
Arbitration
2943 tbl 15
Inputs
Outputs
CE L
X
H
X
L
CE R
X
X
H
L
A 0L -A 14L
A 0R -A 14R
NO MATCH
MATCH
MATCH
MATCH
BUSY L (1)
H
H
H
(2)
BUSY R (1)
H
H
H
(2)
Function
Normal
Normal
Normal
Write Inhibit (3)
NOTES:
2943 tbl 16
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 IDT70V07 are push-
pull, not open drain outputs. On slaves the BUSY input internally inhibits writes.
2. "L" if the inputs to the opposite port were stable prior to the address and enable inputs of this port. "H" 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 can not be LOW simultaneously.
3. 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.
Truth Table V — Example of Semaphore Procurement Sequence (1,2,3)
Functions
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
NOTES:
D 0 - D 7 Left
1
0
0
1
1
0
1
1
1
0
1
D 0 - D 7 Right
1
1
1
0
0
1
1
0
1
1
1
Status
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
2943 tbl 17
1. This table denotes a sequence of events for only one of the eight semaphores on the IDT70V07.
2. There are eight semaphore flags written to via I/O 0 and read from all I/O's (I/O 0 - I/O 7 ). These eight semaphores are addressed by A 0 -A 2 .
3. CE = V IH , SEM = V IL to access the semaphores. Refer to the Semaphore Read/Write Control Truth Table.
14
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