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Data Sheet

ADIN1101

THEORY OF OPERATION

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Rev. A | 15 of 79

Leader/Follower Advertisement

On a 10BASE-T1L link, a local node and its remote link partner

advertise their role capabilities whether they can operate as leader,

follower, prefer leader, or prefer follower.

The ADIN1101 PHY provides the following functions:

►

Leader/follower configuration advertisement

►

Forced leader/follower configuration advertisement

►

Read link partner leader/follower configuration

Leader/Follower Configuration Advertisement

The leader/follower configuration register bit (AN_ADV_MST) is

used to configure the PHY to advertise its leader/follower configura-

tion. Note that this bit is configured after power-up, hardware reset,

or software reset based on the MS_SEL configuration pin signal

status and can be overridden by software via the MDIO interface.

Forced Leader/Follower Configuration

The ADIN1101 PHY can be forced to operate as a leader/follower.

Forced configuration must be used with caution because a config-

uration fault can occur if the link partner is also set in forced

mode as a leader/follower, resulting in autonegotiation failure. The

ADIN1101 can be forced to operate as a leader or follower using

the force leader/follower configuration bit (AN_ADV_FORCE_MS)

in the BASE-T1 autonegotiation advertisement register, Bits[15:0]

(AN_ADV_ABILITY_L).

Read Link Partner Leader/Follower

Configuration

The link partner advertised leader/follower setting can be read

using the following bits:

►

AN_LP_ADV_FORCE_MS: link partner force leader/follower

configuration register bit

►

AN_LP_ADV_MST: link partner leader/follower configuration reg-

ister bit

These bits are updated during the autonegotiation process and

are valid when the autonegotiation complete register bit (AN_COM-

PLETE) is set.

Leader/Follower Resolution

Determination of Leader/Follower

Configuration

On a 10BASE-T1L link, when the local and remote PHYs have the

same preferred configuration, for example, both follower or both

leader, autonegotiation randomly assigns compatible configurations

to the local and remote PHYs. When one PHY has a forced

configuration, its leader/follower configuration is given priority over

a PHY with a preferred setting.

Leader/Follower Configuration Resolution

The ADIN1101 leader/follower configuration defined by the autone-

gotiation can be checked using the leader/follower resolution result

PHY is configured as leader or follower or if there was a configura-

tion fault.

These bits are updated during the autonegotiation process and

are valid when the autonegotiation complete register bit (AN_COM-

PLETE) is set.

Table 12. Determination of Leader/Follower by Autonegotiation

Local1

Remote1

Local

Remote

AN_ADV_FORCE_MS

AN_ADV_MST

AN_LP_ADV_FORCE_MS

AN_LP_ADV_MST

Leader/Follower Resolution

Leader/follower

Follower/leader

Follower

Leader

Follower

Leader/follower

Follower/leader

Leader

Follower

Leader

Follower

Leader

Follower

Configuration fault

Follower

Leader

Follower

Configuration fault

1 X means don't care.

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