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参数资料
| 型号： | IDT7007S20PF8 |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 20/21页 |
| 文件大小： | 0K |
| 描述： | IC SRAM 256KBIT 20NS 80TQFP |
| 标准包装： | 750 |
| 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： | 20ns |
| 接口： | 并联 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 80-LQFP |
| 供应商设备封装： | 80-TQFP（14x14） |
| 包装： | 带卷 (TR) |
| 其它名称： | 7007S20PF8 |
IDT7007S/L
High-Speed 32K x 8 Dual-Port Static RAM
Once the left side was finished with its task, it would write a one to
Semaphore 0 and may then try to gain access to Semaphore 1. If
Semaphore 1 was still occupied by the right side, the left side could undo
its semaphore request and perform other tasks until it was able to write, then
read a zero into Semaphore 1. If the right processor performs a similar task
with Semaphore 0, this protocol would allow the two processors to swap
16K blocks of Dual-Port RAM with each other.
The blocks do not have to be any particular size and can even be
variable, depending upon the complexity of the software using the
semaphore flags. All eight semaphores could be used to divide the Dual-
Port RAM or other shared resources into eight parts. Semaphores can
even be assigned different meanings on different sides rather than being
given a common meaning as was shown in the example above.
Semaphores are a useful form of arbitration in systems like disk
interfaces where the CPU must be locked out of a section of memory during
a transfer and the I/O device cannot tolerate any wait states. With the use
of semaphores, once the two devices has determined which memory area
20
Military, Industrial and Commercial Temperature Ranges
was “off-limits” to the CPU, both the CPU and the I/O devices could access
their assigned portions of memory continuously without any wait states.
Semaphores are also useful in applications where no memory “WAIT”
state is available on one or both sides. Once a semaphore handshake has
been performed, both processors can access their assigned RAM
segments at full speed.
Another application is in the area of complex data structures. In this
case, block arbitration is very important. For this application one processor
may be responsible for building and updating a data structure. The other
processor then reads and interprets that data structure. If the interpreting
processor reads an incomplete data structure, a major error condition may
exist. Therefore, some sort of arbitration must be used between the two
different processors. The building processor arbitrates for the block, locks
it and then is able to go in and update the data structure. When the update
is completed, the data structure block is released. This allows the
interpreting processor to come back and read the complete data structure,
thereby guaranteeing a consistent data structure.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IDT7007S20PFB | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:HIGH-SPEED 32K x 8 DUAL-PORT STATIC RAM |
| IDT7007S20PFI | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:HIGH-SPEED 32K x 8 DUAL-PORT STATIC RAM |
| IDT7007S25G | 功能描述:IC SRAM 256KBIT 25NS 68PGA RoHS:否 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:3,000 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:8K (1K x 8) 速度:400kHz 接口:I²C，2 线串口 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| IDT7007S25GB | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:HIGH-SPEED 32K x 8 DUAL-PORT STATIC RAM |
| IDT7007S25GI | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:HIGH-SPEED 32K x 8 DUAL-PORT STATIC RAM |
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