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参数资料
| 型号： | IDT7005S35PF8 |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 19/21页 |
| 文件大小： | 0K |
| 描述： | IC SRAM 64KBIT 35NS 64TQFP |
| 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： | 64K (8K x 8) |
| 速度： | 35ns |
| 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： | 64-LQFP |
| 供应商设备封装： | 64-TQFP（14x14） |
| 包装： | 带卷 (TR) |
| 其它名称： | 7005S35PF8 |
IDT7005S/L
High-Speed 8K x 8 Dual-Port Static RAM
Semaphore 1 could be defined as the indicator for the upper section of
memory.
To take a resource, in this example the lower 4K of Dual-Port RAM,
the processor on the left port could write and then read a zero in to
Semaphore 0. If this task were successfully completed (a zero was read
back rather than a one), the left processor would assume control of the
lower 4K. Meanwhile the right processor was attempting to gain control of
the resource after the left processor, it would read back a one in response
to the zero it had attempted to write into Semaphore 0. At this point, the
software could choose to try and gain control of the second 4K section by
writing, then reading a zero into Semaphore 1. If it succeeded in gaining
control, it would lock out the left side.
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
4K 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
L PORT
SEMAPHORE
REQUEST FLIP FLOP
Military, Industrial and Commercial Temperature Ranges
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
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.
R PORT
SEMAPHORE
REQUEST FLIP FLOP
D 0
D
Q
Q
D
D 0
WRITE
WRITE
SEMAPHORE
READ
Figure 4. IDT7005 Semaphore Logic
19
6.42
SEMAPHORE
READ
2738 drw 20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IDT7005S35PFB | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:HIGH-SPEED 8K x 8 DUAL-PORT STATIC RAM |
| IDT7005S35PFG | 功能描述:IC SRAM 64KBIT 35NS 64TQFP RoHS:是 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:2,500 系列:- 格式 - 存储器:EEPROMs - 串行 存储器类型:EEPROM 存储容量:1K (128 x 8) 速度:100kHz 接口:UNI/O?（单线） 电源电压:1.8 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MSOP 包装:带卷 (TR) |
| IDT7005S35PFG8 | 制造商:Integrated Device Technology Inc 功能描述: 制造商:Integrated Device Technology Inc 功能描述:IC SRAM 64KBIT 35NS 64TQFP |
| IDT7005S35PFI | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 Dual-Port SRAM |
| IDT7005S35XL | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x8 Dual-Port SRAM |
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