![]() |
Electronic Components Datasheet Search |
|
IDT7035S Datasheet(PDF) 18 Page - Integrated Device Technology |
|
|
IDT7035S Datasheet(HTML) 18 Page - Integrated Device Technology |
18 / 19 page ![]() 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. |
Similar Part No. - IDT7035S_15 |
|
Similar Description - IDT7035S_15 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |