Manynetworkprotocolsaredescribedusingtheseven
layerOpenSystemInterconnection(OSI)model,as
showninFigure1.TheControllerAreaNetwork(CAN)
protocoldefinestheDataLinkLayerandpartofthe
PhysicalLayerintheOSImodel.Theremainingphysi-
callayer(andallofthehigherlayers)arenotdefinedby
theCANspecification.Theseotherlayerscaneitherbe
definedbythesystemdesigner,ortheycanbeimple-
mentedusingexistingnon-proprietaryHigherLayer
Protocols(HLPs)andphysicallayers.
TheDataLinkLayerisdefinedbytheCANspecifica-
tion.TheLogicalLinkControl(LLC)managestheover-
loadcontrolandnotification,messagefilteringand
recoverymanagementfunctions.TheMediumAccess
Control(MAC)performsthedataencapsulation/decap-
sulation,errordetectionandcontrol,bitstuffing/de-
stuffingandtheserializationanddeserialization
functions.MAN228ACANPhysicalLayerDiscussionThePhysicalMediumAttachment(PMA)andMediumAuthor:PatRichardsDependentInterface(MDI)arethetwopartsoftheMicrochipTechnologyInc.physicallayerwhicharenotdefinedbyCAN.ThePhysicalSignaling(PS)portionofthephysicallayerisINTRODUCTIONdefinedbytheCANspecification.Th
暂无评论