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7.14.3.3EMACRGMIIElectricalData/Timing
RGREFCLK
(Output)
2
3
4
4
1
SM320C6455-EP
FIXED-POINTDIGITALSIGNALPROCESSOR
SPRS462B–SEPTEMBER2007–REVISEDJANUARY2008
Anextraclocksignal,RGREFCLK,runningat125MHzisincludedasaconveniencetotheuser.Note
thatthisreferenceclockisnotafree-runningclock.Thisshouldonlybeusedbyanexternaldeviceifit
doesnotexpectavalidclockduringdevicereset.
Table7-84.SwitchingCharacteristicsOverRecommendedOperatingConditionsforEMACRGREFCLK-
RGMIIOperation(seeFigure7-68)
-720
-850
A-1000/-1000
NO.PARAMETERUNIT
-1200
MINMAX
1t
c(RGFCLK)
Cycletime,RGREFCLK8-0.88+0.8ns
2t
w(RGFCLKH)
Pulseduration,RGREFCLKhigh3.24.8ns
3t
w(RGFCLKL)
Pulseduration,RGREFCLKlow3.24.8ns
4t
t(RGFCLK)
Transitiontime,RGREFCLK0.75ns
Figure7-68.RGREFCLKTiming
Table7-85.TimingRequirementsforRXC-RGMIIOperation(seeFigure7-69)
-720
-850
A-1000/-1000
NO.UNIT
-1200
MINMAX
10Mbps360440
1t
c(RXC)
Cycletime,RXC100Mbps3644ns
1000Mbps7.28.8
10Mbps0.40*t
c(RXC)
0.60*t
c(RXC)
2t
w(RXCH)
Pulseduration,RXChigh100Mbps0.40*t
c(RXC)
0.60*t
c(RXC)
ns
1000Mbps0.45*t
c(RXC)
0.55*t
c(RXC)
10Mbps0.40*t
c(RXC)
0.60*t
c(RXC)
3t
w(RXCL)
Pulseduration,RXClow100Mbps0.40*t
c(RXC)
0.60*t
c(RXC)
ns
1000Mbps0.45*t
c(RXC)
0.55*t
c(RXC)
10Mbps0.75
4t
t(RXC)
Transitiontime,RXC100Mbps0.75ns
1000Mbps0.75
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