RTL8201BL
RTL8201B(L)
DVDD33(pin14)
AVDD33(pin36)
Ferrite Bead
3.3V-drived
circuit
3.3V
3.3V
0.1uF
0.1uF
DVDD33(pin48)
Error Amp
-
+
MOSFET P
0.1uF
PWFBOUT(pin32)
Ferrite Bead
1.2V
bandgap
voltage
22uF
0.1uF
PWFBIN(pin8)
2.5V-drived
circuit
0.1uF
7.12 Far End Fault Indication (FEFI)
The MII Reg.1.4 (Remote Fault) is the FEFI bit when 100FX mode is enabled which indicates that FEFI has
been detected. FEFI is an alternative in-band signaling method which is composed of 84 consecutive ‘1’
followed by one ‘0’. From the point of view of the RTL8201BL, when this pattern is detected three times,
Reg.1.4 is set, which means the transmit path (the Remote side’s receive path) has a problem. On the other hand,
the incoming signal failure in causing a link OK will force the RTL8201BL to start sending this pattern, which
in turn causes the remote side to detect a Far-End-Fault. This means that the receive path has a problem from the
point of view of the RTL8201BL. The FEFI mechanism is used only in 100Base-FX mode.
2002-03-29
Rev.1.2
20
ETC [ ETC ]
