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5.49.20TransmitSingleCollisionFramesRegister(TXSINGLECOLL)
5.49.21TransmitMultipleCollisionFramesRegister(TXMULTICOLL)
5.49.22TransmitExcessiveCollisionFramesRegister(TXEXCESSIVECOLL)
5.49.23TransmitLateCollisionFramesRegister(TXLATECOLL)
5.49.24TransmitUnderrunErrorRegister(TXUNDERRUN)
EthernetMediaAccessController(EMAC)Registers
ThetotalnumberofframestransmittedontheEMACthatexperiencedexactlyonecollision.Sucha
frameisdefinedashavingallofthefollowing:
•WasanydataorMACcontrolframedestinedforanyunicast,broadcast,ormulticastaddress
•Wasanysize
•Hadnocarrierlossandnounderrun
•Experiencedonecollisionbeforesuccessfultransmission.Thecollisionwasnotlate.
CRCerrorshavenoeffectonthisstatistic.
ThetotalnumberofframestransmittedontheEMACthatexperiencedmultiplecollisions.Suchaframe
isdefinedashavingallofthefollowing:
•WasanydataorMACcontrolframedestinedforanyunicast,broadcast,ormulticastaddress
•Wasanysize
•Hadnocarrierlossandnounderrun
•Experienced2to15collisionsbeforebeingsuccessfullytransmitted.Noneofthecollisionswere
late.
CRCerrorshavenoeffectonthisstatistic.
Thetotalnumberofframeswhentransmissionwasabandonedduetoexcessivecollisions.Sucha
frameisdefinedashavingallofthefollowing:
•WasanydataorMACcontrolframedestinedforanyunicast,broadcast,ormulticastaddress
•Wasanysize
•Hadnocarrierlossandnounderrun
•Experienced16collisionsbeforeabandoningallattemptsattransmittingtheframe.Noneofthe
collisionswerelate.
CRCerrorshavenoeffectonthisstatistic.
Thetotalnumberofframeswhentransmissionwasabandonedduetoalatecollision.Suchaframeis
definedashavingallofthefollowing:
•WasanydataorMACcontrolframedestinedforanyunicast,broadcast,ormulticastaddress
•Wasanysize
•Hadnocarrierlossandnounderrun
•Experiencedacollisionlaterthan512bit-timesintothetransmission.Theremayhavebeenupto15
previous(non-late)collisionsthathadpreviouslyrequiredthetransmissiontobereattempted.The
latecollisionsstatisticdominatesoverthesingle,multiple,andexcessivecollisionsstatistics.Ifa
latecollisionoccurs,theframeisnotcountedinanyoftheseotherthreestatistics.
CRCerrors,carrierloss,andunderrunhavenoeffectonthisstatistic.
ThenumberofframessentbytheEMACthatexperiencedFIFOunderrun.Latecollisions,CRCerrors,
carrierloss,andunderrunhavenoeffectonthisstatistic.
SPRU941A–April2007EthernetMediaAccessController(EMAC)/113
ManagementDataInput/Output(MDIO)
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