10/100 Non-PCI Ethernet Single Chip MAC + PHY

Datasheet

 

0 BT

4.5 BT

 

 

3.1 V

 

 

 

0.5 V/ns

 

 

0.25 BT 2.25 BT

 

585 mV

 

6.0 BT

 

 

+50 mV

-50 mV

45.0 BT

585 mV sin(2 * * (t/1BT))

0 t 0.25 BT and

2.25t 2.5 BT

-3.1 V

2.5 BT

4.5 BT

Figure 7.6 SOI Output Voltage Template - 10MBPS7.7.12Link Integrity & AutoNegotiationGeneral

The LAN91C111 can be configured to implement either the standard link integrity algorithms or the AutoNegotiation 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 AutoNegotiation 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 establish an active link to and from a remote device. The standard link integrity and AutoNegotiation algorithms are described below.

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

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 algorithm uses normal link pulses, referred to as NLP's and transmitted during idle periods, to determine if a device has successfully 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.

SMSC LAN91C111 REV C

37

Revision 1.91 (08-18-08)

DATASHEET