LAN91C111 datasheet(32/125 Pages) MICROCHIP

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LAN91C111

DS00002276A-page 32

 2011-2016 Microchip Technology Inc.

7.7.12

LINK INTEGRITY & AUTO-NEGOTIATION

7.7.12.1

General

The LAN91C111 can be configured to implement either the standard link integrity algorithms or the Auto-Negotiation

algorithm.

The standard link integrity algorithms are used solely to establish an active link to and from a remote device. There are

different standard link integrity algorithms for 10 and 100 Mbps modes. The Auto-Negotiation algorithm is used for two

purposes: (1) To automatically configure the device for either 10/100 Mbps and Half/Full Duplex modes, and (2) to estab-

lish an active link to and from a remote device. The standard link integrity and Auto-Negotiation algorithms are described

below.

Auto-Negotiation is only specified for 100BASE-TX and 10BASE-T operation.

7.7.12.2

10BASE-T Link Integrity Algorithm - 10Mbps

The LAN91C111 uses the same 10BASE-T link integrity algorithm that is defined in IEEE 802.3 Clause 14. This algo-

rithm uses normal link pulses, referred to as NLP's and transmitted during idle periods, to determine if a device has suc-

cessfully established a link with a remote device (called Link Pass State). The transmit link pulse meets the template

defined in IEEE 802.3 Clause 14 and shown in Figure 7-7. Refer to IEEE 802.3 Clause 14 for more details if needed.

FIGURE 7-6:

SOI OUTPUT VOLTAGE TEMPLATE - 10MBPS

0 BT

4.5 BT

6.0 BT

+50 mV

45.0 BT

4.5 BT

2.5 BT

2.25 BT

0.25 BT

0.5 V/ns

3.1 V

-50 mV

585 mV

-3.1 V

585 mV sin(2

(t/1BT))

0.25 BT and

2.25

2.5 BT

***

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