LAN91C111 Datasheet, PDF (32/125 Pages) SMSC Corporation – 10/100 Non-PCI Ethernet Single Chip MAC + PHY

LAN91C111
FIGURE 7-6:
SOI OUTPUT VOLTAGE TEMPLATE - 10MBPS
0 BT
3.1 V
0.5 V/ns
4.5 BT
585 mV
0.25 BT 2.25 BT
6.0 BT
585 mV sin(2 _{* *} (t/1BT))
0 t 0.25 BT and
2.25 t 2.5 BT
+50 mV
-50 mV
45.0 BT
-3.1 V
2.5 BT
4.5 BT
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.
DS00002276A-page 32
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