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IDT7035S Datasheet(PDF) 18 Page - Integrated Device Technology

Part # IDT7035S
Description  HIGH-SPEED 8K x 18 DUAL-PORT STATIC RAM
Download  19 Pages
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT7035S Datasheet(HTML) 18 Page - Integrated Device Technology

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6.42
IDT7035S/L
High-Speed 8K x 18 Dual-Port Static RAM
Industrial and Commercial Temperature Ranges
18
The blocks do not have to be any particular size and can even be
variable, depending upon the complexity of the software using the
semaphoreflags.AlleightsemaphorescouldbeusedtodividetheDual-
Port RAM or other shared resources into eight parts. Semaphores can
evenbeassigneddifferentmeaningsondifferentsidesratherthanbeing
given a common meaning as was shown in the example above.
Semaphores are a useful form of arbitration in systems like disk
interfaceswheretheCPUmustbelockedoutofasectionofmemoryduring
atransferandtheI/Odevicecannottolerateanywaitstates.Withtheuse
ofsemaphores,oncethetwodeviceshasdeterminedwhichmemoryarea
was“off-limits”totheCPU,boththeCPUandtheI/Odevicescouldaccess
theirassignedportionsofmemorycontinuouslywithoutanywaitstates.
Semaphoresarealsousefulinapplicationswherenomemory“WAIT”
stateisavailableononeorbothsides.Onceasemaphorehandshakehas
Figure 4. IDT7035 Semaphore Logic
D
4088 drw 18
0
D
Q
WRITE
D0
D
Q
WRITE
SEMAPHORE
REQUEST FLIP FLOP
SEMAPHORE
REQUEST FLIP FLOP
LPORT
RPORT
SEMAPHORE
READ
SEMAPHORE
READ
,
been performed, both processors can access their assigned RAM
segmentsatfullspeed.
Another application is in the area of complex data structures. In this
case,blockarbitrationisveryimportant.Forthisapplicationoneprocessor
mayberesponsibleforbuildingandupdatingadatastructure.Theother
processorthenreadsandinterpretsthatdatastructure.Iftheinterpreting
processorreadsanincompletedatastructure,amajorerrorconditionmay
exist.Therefore,somesortofarbitrationmustbeusedbetweenthetwo
differentprocessors.Thebuildingprocessorarbitratesfortheblock,locks
itandthenisabletogoinandupdatethedatastructure.Whentheupdate
is completed, the data structure block is released. This allows the
interpretingprocessortocomebackandreadthecompletedatastructure,
therebyguaranteeingaconsistentdatastructure.


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