LAN8808D datasheet(32/80 Pages) MICROCHIP

32 / 80 page

LAN8808D

DS00005833C-page 32

5.6.1

AUTO-NEGOTIATION NEXT PAGE USAGE

The device supports “Next Page” capability which is used to negotiate Gigabit Ethernet and Energy Efficient Ethernet

functionality as well as to support software controlled pages.

As described in IEEE 802.3 Annex 40C “Add-on interface for additional Next Pages”, the device will autonomously send

and receive the Gigabit Ethernet and Energy Efficient Ethernet next pages and then optionally send and receive soft-

ware controlled next pages.

Gigabit Ethernet next pages consist of one message and two unformatted pages. The message page contains an 8 as

the message code. The first unformatted page contains the information from the Auto-Negotiation Master Slave Control

tion. The result of the Gigabit Ethernet next pages exchange is stored in Auto-Negotiation Master Slave Status register.

Gigabit Ethernet next pages are always transmitted, regardless of the advertised settings in the Auto-Negotiation Master

Slave Control register.

Energy Efficient Ethernet (EEE) next pages consist of one message and one unformatted page. The message page

contains a 10 as the message code (this value can be overridden in the EEE Message Code register). The unformatted

page contains the information from the EEE Advertisement register. The result of the Gigabit Ethernet next pages

exchange is stored in EEE Link Partner Ability register.

EEE next pages are transmitted only if the advertised setting in the EEE Advertisement register is not zero.

Following the EEE next page exchange, software controlled next pages are exchanged when the Next Page bit in the

Auto-Negotiation Advertisement register is set. Software controlled next page status is monitored via the Auto-Negoti-

ation Expansion register and Auto-Negotiation Next Page RX register.

5.6.2

PARALLEL DETECT DUPLEX

Normally, and according to IEEE 802.3, when parallel detection is used to establish the link, the resulting operation is

set to half duplex. An option exists to force this result to full duplex. This is enabled by setting the LP Force 100 FD

Override and/or LP Force 10 FD Override bits in the Parallel Detect Full Duplex Override register.

TABLE 5-2:

AUTO-NEGOTIATION TIMERS

Auto-Negotiation Interval Timers

Time Duration

Transmit Burst Interval

16 ms

Transmit Pulse Interval

68 µs

FLP Detect Minimum Time

17.2 µs

FLP Detect Maximum Time

185 µs

Receive Minimum Burst Interval

6.8 ms

Receive Maximum Burst Interval

112 ms

Data Detect Minimum Interval

35.4 µs

Data Detect Maximum Interval

95 µs

Normal Link Pulse (NLP) Test Minimum Interval

4.5 ms

NLP Test Maximum Interval

30 ms

Link Loss Time

52 ms

Break Link Time

1480 ms

Parallel Detection Wait Time

830 ms

Link Enable Wait Time

1000 ms

APPLICATION NOTE: The Gigabit Ethernet and EEE next pages may be viewed in Auto-Negotiation Next Page

RX register as they are exchanged.

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