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LAN8742Ai-CZ Datasheet(PDF) 50 Page - Microchip Technology

Part # LAN8742Ai-CZ
Description  Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR짰 Technology
PDF  124 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN8742Ai-CZ Datasheet(HTML) 50 Page - Microchip Technology

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LAN8742A/LAN8742Ai
DS00001989A-page 50
 2013-2015 Microchip Technology Inc.
3.8.10
LOOPBACK OPERATION
The device may be configured for near-end loopback and far loopback. These loopback modes are detailed in the fol-
lowing subsections.
3.8.10.1
Near-end Loopback
Near-end loopback mode sends the digital transmit data back out the receive data signals for testing purposes, as indi-
cated by the blue arrows in Figure 3-17. The near-end loopback mode is enabled by setting the Loopback bit of the
Basic Control Register to “1”. A large percentage of the digital circuitry is operational in near-end loopback mode
because data is routed through the PCS and PMA layers into the PMD sublayer before it is looped back. The transmit-
ters are powered down regardless of the state of TXEN.
3.8.10.2
Far Loopback
Far loopback is a special test mode for MDI (analog) loopback as indicated by the blue arrows in Figure 3-18. The far
loopback mode is enabled by setting the FARLOOPBACK bit of the Mode Control/Status Register to “1”. 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.
FIGURE 3-17:
NEAR-END LOOPBACK BLOCK DIAGRAM
FIGURE 3-18:
FAR LOOPBACK BLOCK DIAGRAM
Microchip
Ethernet Transceiver
10/100
Ethernet
MAC
CAT-5
XFMR
Digital
RXD
TXD
Analog
RX
TX
X
X
Far-end system
Microchip
Ethernet Transceiver
10/100
Ethernet
MAC
CAT-5
XFMR
Digital
RXD
TXD
Analog
RX
TX
Link
Partner
X
X



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