8101 datasheet(57/172 Pages) LSI

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AutoNegotiation

2-39

2.15 AutoNegotiation

The AutoNegotiation algorithm is a negotiation sequence between two

stations over the 10-bit PHY interface that establishes a good link

between two stations, and conﬁgures both stations for the same mode of

operation. The AutoNegotiation algorithm in the controller meets all

speciﬁcations deﬁned in IEEE 802.3z.

AutoNegotiation uses a stream of /C/ ordered sets to pass an

AutoNegotiation data word to and from a remote station. The /C/ ordered

set stream consists of an alternating sequence of /C1/ and /C2/ ordered

sets. The /C1/ and /C2/ ordered sets contain two unique 10B code words

plus a 16-bit AutoNegotiation data word, as deﬁned in IEEE 802.3z and

shown in Figure 2.6.

Figure 2.6

AutoNegotiation Data Format

K28.5

D21.5

<Bits[0:7]>

<Bits[8:15]>

K28.5

D2.2

<Bits[0:7]>

<Bits[8:15]>

From

Registers

21 – 22

From

Registers

21 – 22

A B C D E F G H

a b c d e f g h i j

PCS 8B Codes

PCS 10B Codes

TX[0]

RX[0]

TX[9]

RX[9]

TX PHY. INT.

RX PHY. INT.

Note:

< > Means 10B Encoded

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