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參數(shù)資料
| 型號(hào)： | 7016S35PFGB |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | SRAM |
| 英文描述： | 16K X 9 DUAL-PORT SRAM, 35 ns, PQFP80 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, GREEN, TQFP-80 |
| 文件頁(yè)數(shù)： | 11/20頁(yè) |
| 文件大小： | 164K |
| 代理商： | 7016S35PFGB |
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6.42
IDT7016S/L
High-Speed 16K x 9 Dual-Port Static RAM
Military, Industrial and Commercial Temperature Ranges
19
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
interfaceswheretheCPUmustbelockedoutofasectionofmemoryduring
a transfer and the I/O device cannot tolerate any wait states. With the use
ofsemaphores,oncethetwodeviceshasdeterminedwhichmemoryarea
was“off-limits”totheCPU,boththeCPUandtheI/Odevicescouldaccess
their assigned portions of memory continuously without any wait states.
Semaphoresarealsousefulinapplicationswherenomemory“WAIT”
stateisavailableononeorbothsides.Onceasemaphorehandshakehas
been performed, both processors can access their assigned RAM
Figure 4. IDT7016 Semaphore Logic
D
3190 drw 20
0
D
Q
WRITE
D0
D
Q
WRITE
SEMAPHORE
REQUEST FLIP FLOP
SEMAPHORE
REQUEST FLIP FLOP
LPORT
RPORT
SEMAPHORE
READ
SEMAPHORE
READ
,
segments at full speed.
Another application is in the area of complex data structures. In this
case,blockarbitrationisveryimportant.Forthisapplicationoneprocessor
may be responsible for building and updating a data structure. The other
processor then reads and interprets that data structure. If the interpreting
processorreadsanincompletedatastructure,amajorerrorconditionmay
exist. Therefore, some sort of arbitration must be used between the two
differentprocessors.Thebuildingprocessorarbitratesfortheblock,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
interpretingprocessortocomebackandreadthecompletedatastructure,
thereby guaranteeing a consistent data structure.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 7016S35PFI | 功能描述:IC SRAM 144KBIT 80TQFP 制造商:idt, integrated device technology inc 系列:* 零件狀態(tài):最後搶購(gòu) 標(biāo)準(zhǔn)包裝:90 |
| 7016S35PFI8 | 功能描述:IC SRAM 144KBIT 80TQFP 制造商:idt, integrated device technology inc 系列:* 零件狀態(tài):最後搶購(gòu) 標(biāo)準(zhǔn)包裝:750 |
| 7016-SS | 功能描述:螺絲和緊固件 Shoulder Screw SS 6-32 9/32in RoHS:否 制造商:Unspecified 產(chǎn)品: 類型:Washer 螺紋大小: 長(zhǎng)度: 材料:Steel 電鍍:Nickel 螺絲頭: 螺絲類型: |
| 7016X | 制造商:CML 制造商全稱:Chicago Miniature Lamp,inc 功能描述:SMT LEDs 1208 Package Size |
| 7016X1 | 功能描述:標(biāo)準(zhǔn)LED-SMD RED WATER CLEAR RoHS:否 制造商:Vishay Semiconductors 封裝 / 箱體:0402 LED 大小:1 mm x 0.5 mm x 0.35 mm 照明顏色:Red 波長(zhǎng)/色溫:631 nm 透鏡顏色/類型:Water Clear 正向電流:30 mA 正向電壓:2 V 光強(qiáng)度:54 mcd 顯示角:130 deg 系列:VLMx1500 封裝:Reel |
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