ADIN1100CCPZ-R7 datasheet(18/78 Pages) AD

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Data Sheet

ADIN1100

THEORY OF OPERATION

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Rev. 0 | 18 of 78

Master/Slave Advertisement

Master/Slave Configuration Advertisement

The master/slave configuration register bit (AN_ADV_MST) is used

to configure the PHY to advertise its master/slave configuration.

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 Master/Slave Configuration

If it is mandatory for the PHY to operate as a master (or slave), use

the advertise forced configuration. Forced configuration must be

used with caution because a configuration fault can occur if the link

partner is also set in forced mode as a master (or slave) resulting

in autonegotiation failure. The ADIN1100 can be forced to operate

as a master or slave using the force master/slave configuration

Read Link Partner Master/Slave Configuration

The link partner advertised master/slave setting can be read using

the following bits:

►

AN_LP_ADV_FORCE_MS: link partner force master/slave con-

figuration register bit

►

AN_LP_ADV_MST: link partner master/slave configuration regis-

ter bit

These bits are updated during the autonegotiation process and

are valid when the autonegotiation complete register bit (AN_COM-

PLETE) is set.

Master/Slave Resolution

Determination of Master/Slave Configuration

When the local and remote PHYs have the same preferred config-

uration, for example, both slave or both master, autonegotiation

randomly assigns compatible configurations to the local and remote

PHYs. When one PHY has a forced configuration, its master/slave

configuration is given priority over a PHY with a preferred setting.

Master/Slave Configuration Resolution

The ADIN1100 master/slave configuration defined by the autonego-

tiation can be checked using the master/slave resolution result

PHY is configured as master or slave or if there was a configuration

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 Master/Slave by Autonegotiation

Local1

Remote1

Local

Remote

AN_ADV_FORCE_MS

AN_ADV_MST

AN_LP_ADV_FORCE_MS

AN_LP_ADV_MST

Master/Slave Resolution

Master/slave

Slave/master

Slave

Master

Slave

Master/slave

Slave/master

Master

Slave

Master

Slave

Master

Slave

Configuration fault

Slave

Master

Slave

Configuration fault

1 X means don't care.

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