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LAN8700 Datasheet(PDF) 45 Page - Microchip Technology

Part # LAN8700
Description  짹15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support and flexPWR짰 Technology in a Small Footprint
PDF  74 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN8700 Datasheet(HTML) 45 Page - Microchip Technology

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 2007-2016 Microchip Technology Inc.
DS00002260A-page 45
LAN8700/LAN8700i
5.4.8.2
Far Loopback
Far loopback is a special test mode for MDI (analog) loopback as indicated by the blue arrows in Figure 5-3. The far
loopback mode is enabled by setting bit register 17 bit 9 to logic one. In this mode, data that is received from the link
partner on the MDI is looped back out to the link partner. The digital interface signals on the local MAC interface are
isolated.
5.4.8.3
Connector Loopback
The LAN8700/LAN8700i maintains reliable transmission over very short cables, and can be tested in a connector loop-
back as shown in Figure 5-4. An RJ45 loopback cable can be used to route the transmit signals an the output of the
transformer back to the receiver inputs, and this loopback will work at both 10 and 100.
FIGURE 5-2:
NEAR-END LOOPBACK BLOCK DIAGRAM
Note:
This special test mode is only available when operating in RMII mode.
FIGURE 5-3:
FAR LOOPBACK BLOCK DIAGRAM
Ethernet Transceiver
10/100
Ethernet
MAC
CAT-5
XFMR
Digital
RXD
TXD
Analog
RX
TX
X
X
Far-end system
Ethernet Transceiver
10/100
Ethernet
MAC
CAT-5
XFMR
Digital
RXD
TXD
Analog
RX
TX
Link
Partner
X
X



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