LAN8710AI datasheet(28/82 Pages) MICROCHIP

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

Datasheet

Revision 1.4 (08-23-12)

SMSC LAN8710A/LAN8710Ai

DATASHEET

signal transmitted by the link partner. Auto-negotiation resumes in an attempt to determine the new

link configuration.

If the management entity re-starts auto-negotiation by setting the Restart Auto-Negotiate bit of the

Basic Control Register, the LAN8710A/LAN8710Ai will respond by stopping all transmission/receiving

operations. Once the break_link_timer is completed in the Auto-negotiation state-machine

(approximately 1200ms), auto-negotiation will re-start. In this case, the link partner will have also

dropped the link due to lack of a received signal, so it too will resume auto-negotiation.

3.2.3

Disabling Auto-negotiation

Auto-negotiation can be disabled by setting the Auto-Negotiation Enable bit of the Basic Control

Control Register (Speed Select bit and Duplex Mode bit). These bits should be ignored when auto-

negotiation is enabled.

3.2.4

Half vs. Full Duplex

Half duplex operation relies on the CSMA/CD (Carrier Sense Multiple Access / Collision Detect)

protocol to handle network traffic and collisions. In this mode, the carrier sense signal, CRS, responds

to both transmit and receive activity. If data is received while the transceiver is transmitting, a collision

results.

In full duplex mode, the transceiver is able to transmit and receive data simultaneously. In this mode,

CRS responds only to receive activity. The CSMA/CD protocol does not apply and collision detection

is disabled.

LAN8710AI 数据表(PDF) 28 Page - Microchip Technology