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TXC (at DSP)
(B)
TXD[3:0]
(A)
TXCTL
(A)
5
6
1st Half-byte
TXERRTXEN
2nd Half-byte
1
2
Internal TXC
TXC at DSP pins
4
4
2
3
1
SM320C6455-EP
FIXED-POINTDIGITALSIGNALPROCESSOR
SPRS462B–SEPTEMBER2007–REVISEDJANUARY2008
Table7-88.SwitchingCharacteristicsOverRecommendedOperatingConditionsforEMACRGMII
Transmit
(1)
(seeFigure7-70)
-720
-850
A-1000/-1000
NO.PARAMETERUNIT
-1200
MINMAX
5t
su(TXD-TXCH)
Setuptime,transmitselectedsignalsvalidbeforeTXC(atDSP)high/low1.2ns
6t
h(TXCH-TXD)
Holdtime,transmitselectedsignalsvalidafterTXC(atDSP)high/low1.2
(1)ForRGMII,transmitselectedsignalsinclude:TXD[3:0]andTXCTL.
A.Dataandcontrolinformationistransmittedusingbothedgesoftheclocks.TXD[3:0]carriesdatabits3-0ontherising
edgeofTXCanddatabits7-4onthefallingedgeofTXC.Similarly,TX_CTLcarriesTXENonrisingedgeofTXCand
TXERRoffallingedge.
B.TXCisdelayedinternallybeforebeingdriventotheTXCpin.
Figure7-70.EMACTransmitInterfaceTiming[RGMIIOperation]
(A)(B)
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