5.50.35ReceiveFIFOorDMAMiddleofFrameOverrunsRegister(RXMOFOVERRUNS)
5.50.36ReceiveDMAOverrunsRegister(RXDMAOVERRUNS)
EthernetMediaAccessController(EMAC)Registers
ThetotalnumberofframesreceivedontheEMACthathadeitheraFIFOorDMAmiddleofframe
(MOF)overrun.AnMOFoverrunframeisdefinedashavingallofthefollowing:
•WasanydataorMACcontrolframethatmatchedaunicast,broadcast,ormulticastaddress,or
matchedduetopromiscuousmode
•Wasofanysize(includinglessthan64-byteandgreaterthanRXMAXLEN-byteframes)
•TheEMACwasunabletoreceiveitbecauseitdidnothavetheresourcestoreceiveit(cellFIFOfull
ornoDMAbufferavailableaftertheframewassuccessfullystarted-noSOFoverrun).
CRCerrors,alignmenterrors,andcodeerrorshavenoeffectonthisstatistic.
ThetotalnumberofframesreceivedontheEMACthathadeitheraDMAstartofframe(SOF)overrun
oraDMAmiddleofframe(MOF)overrun.AreceiveDMAoverrunframeisdefinedashavingallofthe
following:
•WasanydataorMACcontrolframethatmatchedaunicast,broadcast,ormulticastaddress,or
matchedduetopromiscuousmode
•Wasofanysize(includinglessthan64-byteandgreaterthanRXMAXLEN-byteframes)
•TheEMACwasunabletoreceiveitbecauseitdidnothavetheDMAbufferresourcestoreceiveit
(zeroheaddescriptorpointeratthestartorduringthemiddleoftheframereception).
CRCerrors,alignmenterrors,andcodeerrorshavenoeffectonthisstatistic.
132EthernetMediaAccessController(EMAC)/ManagementDataInput/Output(MDIO)SPRUEQ6–December2007
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