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IDT70V37L
High-Speed 3.3V 32K x 18 Dual-Port Static RAM
Truth Table V —
Address BUSY Arbitration (4)
Industrial and Commercial Temperature Ranges
Inputs
Outputs
CE L
X
H
X
L
CE R
X
X
H
L
A OL -A 14L
A OR -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:
4851 tbl 17
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 IDT70V37 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.
4. Refer to Truth Table I - Chip Enable.
Truth Table VI — 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 17 Left
1
0
0
1
1
0
1
1
1
0
1
D 0 - D 17 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
4851 tbl 18
1. This table denotes a sequence of events for only one of the eight semaphores on the IDT70V37.
2. There are eight semaphore flags written to via I/O 0 and read from all I/O's (I/O 0 -I/O 17 ). These eight semaphores are addressed by A 0 - A 2 .
3. CE = V IH , SEM = V IL to access the semaphores. Refer to the Truth Table III - Semaphore Read/Write Control.
Functional Description
The IDT70V37 provides two ports with separate control, address and
I/O pins that permit independent access for reads or writes to any location
in memory. The IDT70V37 has an automatic power down feature
controlled by CE . The CE 0 and CE 1 control the on-chip power down
circuitry that permits the respective port to go into a standby mode when
not selected ( CE = HIGH). When a port is enabled, access to the entire
memory array is permitted.
Interrupts
If the user chooses the interrupt function, a memory location (mail box
(HEX), where a write is defined as CE R = R/ W R = V IL per the Truth Table.
The left port clears the interrupt through access of address location 7FFE
when CE L = OE L = V IL , R/ W is a "don't care". Likewise, the right port
interrupt flag ( INT R ) is asserted when the left port writes to memory location
7FFF (HEX) and to clear the interrupt flag ( INT R ), the right port must read
the memory location 7FFF. The message (18 bits) at 7FFE or 7FFF is
user-defined since it is an addressable SRAM location. If the interrupt
function is not used, address locations 7FFE and 7FFF are not used as
mail boxes, but as part of the random access memory. Refer to Truth Table
IV for the interrupt operation.
or message center) is assigned to each port. The left port interrupt flag
( INT L ) is asserted when the right port writes to memory location 7FFE
14
6.42
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功能描述:IC SRAM 576KBIT 20NS 100TQFP RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:1,000 系列:- 格式 - 存储器:RAM 存储器类型:SRAM - 双端口，同步 存储容量:1.125M（32K x 36） 速度:5ns 接口:并联 电源电压:3.15 V ~ 3.45 V 工作温度:-40°C ~ 85°C 封装/外壳:256-LBGA 供应商设备封装:256-CABGA（17x17） 包装:带卷 (TR) 其它名称:70V3579S5BCI8
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功能描述:IC SRAM 1.125MBIT 15NS 100TQFP RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:1,000 系列:- 格式 - 存储器:RAM 存储器类型:SRAM - 双端口，同步 存储容量:1.125M（32K x 36） 速度:5ns 接口:并联 电源电压:3.15 V ~ 3.45 V 工作温度:-40°C ~ 85°C 封装/外壳:256-LBGA 供应商设备封装:256-CABGA（17x17） 包装:带卷 (TR) 其它名称:70V3579S5BCI8
IDT70V38L15PFG
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IDT70V38L20PF8
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IDT70V38L20PFGI
制造商:Integrated Device Technology Inc 功能描述:IC SRAM 1.125MBIT 20NS 100TQFP