Filter
Top Products
www.ti.com
RXD[3:0]
(A)
RXCTL
(A)
RXC
(at DSP)
(B)
5
RXERRRXDV
6
1st Half-byte
2nd Half-byte
RXD[7:4]RXD[3:0]
2
3
1
4
4
SM320C6455-EP
FIXED-POINTDIGITALSIGNALPROCESSOR
SPRS462B–SEPTEMBER2007–REVISEDJANUARY2008
Table7-86.TimingRequirementsforEMACRGMIIInputReceivefor10/100/1000Mbps
(1)
(seeFigure7-69)
-720
-850
A-1000/-1000
NO.UNIT
-1200
MINMAX
5t
su(RXD-RXCH)
Setuptime,receiveselectedsignalsvalidbeforeRXC(atDSP)high/low1.0ns
6t
h(RXCH-RXD)
Holdtime,receiveselectedsignalsvalidafterRXC(atDSP)high/low1.0ns
(1)ForRGMII,receiveselectedsignalsinclude:RXD[3:0]andRXCTL.
A.Dataandcontrolinformationisreceivedusingbothedgesoftheclocks.RXD[3:0]carriesdatabits3-0ontherising
edgeofRXCanddatabits7-4onthefallingedgeofRXC.Similarly,RXCTLcarriesRXDVonrisingedgeofRXCand
RXERRonfallingedge
B.RXCmustbeexternallydelayedrelativetothedataandcontrolpins.
Figure7-69.EMACReceiveInterfaceTiming[RGMIIOperation]
(A)(B)
Table7-87.SwitchingCharacteristicsOverRecommendedOperatingConditionsforTXC-RGMII
Operationfor10/100/1000Mbit/s(seeFigure7-70)
-720
-850
A-1000/-1000
NO.UNIT
-1200
MINMAX
10Mbps360440
1t
c(TXC)
Cycletime,TXC100Mbps3644ns
1000Mbps7.28.8
10Mbps0.40*t
c(TXC)
0.60*t
c(TXC)
2t
w(TXCH)
Pulseduration,TXChigh100Mbps0.40*t
c(TXC)
0.60*t
c(TXC)
ns
1000Mbps0.45*t
c(TXC)
0.55*t
c(TXC)
10Mbps0.40*t
c(TXC)
0.60*t
c(TXC)
3t
w(TXCL)
Pulseduration,TXClow100Mbps0.40*t
c(TXC)
0.60*t
c(TXC)
ns
1000Mbps0.45*t
c(TXC)
0.55*t
c(TXC)
10Mbps0.75
4t
t(TXC)
Transitiontime,TXC100Mbps0.75ns
1000Mbps0.75
C64x+PeripheralInformationandElectricalSpecifications 214SubmitDocumentationFeedback