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| LAN8740A Datasheet, PDF (52/136 Pages) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology | |||
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LAN8740A/LAN8740Ai
3.8.12.3 Connector Loopback
The device maintains reliable transmission over very short cables and can be tested in a connector loopback as shown
in Figure 3-16. An RJ45 loopback cable can be used to route the transmit signals from the output of the transformer
back to the receiver inputs. The loopback works at both 10 and 100 Mbps.
FIGURE 3-16:
CONNECTOR LOOPBACK BLOCK DIAGRAM
10/100
Ethernet
MAC
TXD
RXD
Digital
Analog
Microchip
Ethernet Transceiver
1
TX
2
3
XFMR
RX
4
5
6
7
8
RJ45 Loopback Cable.
Created by connecting pin 1 to pin 3
and connecting pin 2 to pin 6.
DS00001987A-page 52
ï£ 2013-2015 Microchip Technology Inc.
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