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GMTCLK
(Output)
2 3
1
4
4
MRCLK (Input)
1
2
MRXD7−MRXD4(GMII only),
MRXD3−MRXD0,
MRXDV, MRXER (Inputs)
TMS320C6454
Fixed-PointDigitalSignalProcessor
SPRS311A–APRIL2006–REVISEDDECEMBER2006
Table7-77.SwitchingCharacteristicsOverRecommendedOperatingConditionsforGMTCLK-GMII
Operation(seeFigure7-61)
-720
-850
-1000
NO.UNIT
1000Mbps
MINMAX
1t
c(GMTCLK)
Cycletime,GMTCLK8ns
2t
w(GMTCLKH)
Pulseduration,GMTCLKhigh2.8ns
3t
w(GMTCLKL)
Pulseduration,GMTCLKlow2.8ns
4t
t(GMTCLK)
Transitiontime,GMTCLK1ns
Figure7-61.GMTCLKTiming(EMAC–Transmit)[GMIIOperation]
Table7-78.TimingRequirementsforEMACMIIandGMIIReceive10/100/1000Mbit/s
(1)
(seeFigure7-62)
-720
-850
-1000
NO.UNIT
1000Mbps100/10Mbps
MINMAXMINMAX
Setuptime,receiveselectedsignalsvalidbefore
1t
su(MRXD-MRCLKH)
28ns
MRCLKhigh
Holdtime,receiveselectedsignalsvalidafter
2t
h(MRCLKH-MRXD)
08ns
MRCLKhigh
(1)ForMII,Receiveselectedsignalsinclude:MRXD[3:0],MRXDV,andMRXER.ForGMII,Receiveselectedsignalsinclude:MRXD[7:0],
MRXDV,andMRXER.
Figure7-62.EMACReceiveInterfaceTiming[MIIandGMIIOperation]
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