5.50.31TransmitandReceive512to1023OctetFramesRegister(FRAME512T1023)
5.50.32TransmitandReceive1024toRXMAXLENOctetFramesRegister(FRAME1024TUP)
5.50.33NetworkOctetFramesRegister(NETOCTETS)
5.50.34ReceiveFIFOorDMAStartofFrameOverrunsRegister(RXSOFOVERRUNS)
EthernetMediaAccessController(EMAC)Registers
Thetotalnumberof512-byteto1023-byteframesreceivedandtransmittedontheEMAC.Sucha
frameisdefinedashavingallofthefollowing:
•AnydataorMACcontrolframethatwasdestinedforanyunicast,broadcast,ormulticastaddress
•Didnotexperiencelatecollisions,excessivecollisions,underrun,orcarriersenseerror
•Was512-bytesto1023-byteslong
CRCerrors,alignment/codeerrors,andoverrunsdonotaffecttherecordingofframesinthisstatistic.
Thetotalnumberof1024-bytetoRXMAXLEN-byteframesreceivedandtransmittedontheEMAC.
Suchaframeisdefinedashavingallofthefollowing:
•AnydataorMACcontrolframethatwasdestinedforanyunicast,broadcast,ormulticastaddress
•Didnotexperiencelatecollisions,excessivecollisions,underrun,orcarriersenseerror
•Was1024-bytestoRXMAXLEN-byteslong
CRC/alignment/codeerrors,underruns,andoverrunsdonotaffectframerecordinginthisstatistic.
ThetotalnumberofbytesofframedatareceivedandtransmittedontheEMAC.Eachframecounted
hasallofthefollowing:
•WasanydataorMACcontrolframedestinedforanyunicast,broadcast,ormulticastaddress
(addressmatchdoesnotmatter)
•Wasofanysize(includinglessthan64-byteandgreaterthanRXMAXLEN-byteframes)
Alsocountedinthisstatisticis:
•Everybytetransmittedbeforeacarrier-losswasexperienced
•Everybytetransmittedbeforeeachcollisionwasexperienced(multipleretriesarecountedeach
time)
•EverybytereceivediftheEMACisinhalf-duplexmodeuntilajamsequencewastransmittedto
initiateflowcontrol.(Thejamsequenceisnotcountedtopreventdouble-counting).
Errorconditionssuchasalignmenterrors,CRCerrors,codeerrors,overruns,andunderrunsdonot
affecttherecordingofbytesinthisstatistic.Theobjectiveofthisstatisticistogiveareasonable
indicationofEthernetutilization.
ThetotalnumberofframesreceivedontheEMACthathadeitheraFIFOorDMAstartofframe(SOF)
overrun.AnSOFoverrunframeisdefinedashavingallofthefollowing:
•WasanydataorMACcontrolframethatmatchedaunicast,broadcast,ormulticastaddress,or
matchedduetopromiscuousmode
•Wasofanysize(includinglessthan64-byteandgreaterthanRXMAXLEN-byteframes)
•TheEMACwasunabletoreceiveitbecauseitdidnothavetheresourcestoreceiveit(cellFIFOfull
ornoDMAbufferavailableatthestartoftheframe).
CRCerrors,alignmenterrors,andcodeerrorshavenoeffectonthisstatistic.
SPRUEQ6–December2007EthernetMediaAccessController(EMAC)/ManagementDataInput/Output(MDIO)131
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