參數(shù)資料
型號(hào)： PC8260MTPU150
廠商： Atmel Corp.
英文描述： PowerPC-based Communications Processors
中文描述： 基于PowerPC的通信處理器
文件頁(yè)數(shù)： 5/53頁(yè)
文件大?。?/td> 364K
代理商： PC8260MTPU150
5
PC8260PowerQUICCII
2131B–HIREL–02/03
SystemInterfaceUnit
(SIU)
TheSIUconsistsofthefollowing:
A60x-compatibleparallelsystembusconfigurableto64-bitdatawidth.ThePC8260
supports64-,32-,16-,and8-bitportsizes.ThePC8260internalarbiterarbitrates
betweeninternalcomponentsthatcanaccessthebus(systemcore,PCIbridge,
CPM,andoneexternalmaster).Thisarbitercanbedisabled,andanexternal
arbitercanbeusedifnecessary.
Alocal(32-bitdata,32-bitinternaland18-bitexternaladdress)bus.Thisbusis
usedtoenhancetheoperationoftheveryhigh-speedcommunicationcontrollers.
Withoutrequiringextensivemanipulationbythecore,thebuscanbeusedtostore
connectiontablesforATMorbufferdescriptors(BDs)forthecommunication
channelsorrawdatathatistransmittedbetweenchannels.Thelocalbusis
synchronoustothe60xbusandrunsatthesamefrequency.
Thelocalbuscanbeconfiguredasa32-bitdataandupto66MHzPCI(version2.1)
bus.InPCImodethebuscanbeprogrammedasahostorasanagent.ThePCI
buscanbeconfiguredtorunsynchronouslyorasynchronouslytothe60xbus.The
PC8260hasaninternalPCIbridgewithanefficient60x-to-PCIDMAformemory
blocktransfers.
ApplicationsthatrequireboththelocalbusandPCIbusneedtoconnectanexternal
PCIbridge.
Amemorycontrollersupporting12memorybanksthatcanbeallocatedforeither
thesystemorthelocalbus.Thememorycontrollerisanenhancedversionofthe
PC8260memorycontroller.Itsupportsthreeuser-programmablemachines.
BesidessupportingallPC8260features,thememorycontrolleralsosupports
SDRAMwithpagemodeandaddressdatapipeline
SupportsJTAGcontrollerIEEE1149.1testaccessport(TAP).
Abusmonitorthatprevents60xbuslock-ups,areal-timeclock,aperiodicinterrupt
timer,andothersystemfunctionsusefulinembeddedapplications.
GluelessinterfacetoL2cacheand4-/16-K-entryCAM.
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