Gmii Timing - Realtek RTL8169 Manual

11.3.5 GMII Timing

RxCLK, GTxCLK
RxD[7:0], RxDV,
RxER, TxD[7:0],
TxEN
Symbol
Vil_ac
Vih_ac
fGTxCLK, fRxCLK GTxCLK, RxCLK frequency
tGCC
tGCH
tGCL
tR
tF
RSR
FSR
tGSUT
tGHTT
tGSUR
tGHTR
2002/03/27
tGCH
Description
Input Low Voltage ac
Input High Voltage ac
GTxCLK, RxCLK Cycle Time
GTxCLK, RxCLK High Time
GTxCLK, RxCLK Low Time
GTxCLK, RxCLK Rise Time
GTxCLK, RxCLK Fall Time
GTxCLK, RxCLK Rising Slew Rate
GTxCLK, RxCLK Falling Slew Rate
TxD, TxEN Setup to ↑ of GTxCLK
TxD, TxEN Hold from ↑ of GTxCLK
RxD, RxDV, RxER Setup to ↑ of RxCLK
RxD, RxDV, RxER Hold from ↑ of RxCLK
GMII Timing Parameters
tGCC
tGCL
tGSUT
tGSUR
tR
GMII Timing
Min
1.9
125 - 100ppm
7.5
2.5
2.5
0.6
0.6
2.5
0.5
2
0
89
tF
tGHTT
tGHTR
Typical Max
0.7
125 125 + 100ppm MHz
8 8.5
1
1
RTL8169
Vih_ac(min)
Vil_ac(max)
Vih_ac(min)
Vil_ac(max)
Units
V
V
ns
ns
ns
ns
ns
V/ns
V/ns
ns
ns
ns
ns
Rev.1.21