LAN8710AI datasheet(43/82 Pages) MICROCHIP

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Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

Datasheet

SMSC LAN8710A/LAN8710Ai

Revision 1.4 (08-23-12)

DATASHEET

Collision Test is enabled in the Basic Control Register. The transmitters are powered down regardless

of the state of TXEN.

3.8.9.2

Far Loopback

Far loopback is a special test mode for MDI (analog) loopback as indicated by the blue arrows in

Figure 3.11. 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.

Note: This special test mode is only available when operating in RMII mode.

3.8.9.3

Connector Loopback

The device maintains reliable transmission over very short cables, and can be tested in a connector

loopback as shown in Figure 3.11. An RJ45 loopback cable can be used to route the transmit signals

Figure 3.9 Near-end Loopback Block Diagram

Figure 3.10 Far Loopback Block Diagram

SMSC

Ethernet Transceiver

10/100

Ethernet

MAC

CAT-5

XFMR

Digital

RXD

TXD

Analog

Far-end system

SMSC

Ethernet Transceiver

10/100

Ethernet

MAC

CAT-5

XFMR

Digital

RXD

TXD

Analog

Link

Partner

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