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ADIN1101CCPZ-R7 数据表(PDF) 15 Page - Analog Devices |
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ADIN1101CCPZ-R7 数据表(HTML) 15 Page - Analog Devices |
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15 / 79 page  Data Sheet ADIN1101 THEORY OF OPERATION analog.com 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 Advertisement 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 register bits (AN_MS_CONFIG_RSLTN). The bits indicate if the 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 0 0 0 0 Leader/follower Follower/leader 0 0 0 1 Follower Leader 0 1 0 0 Leader Follower 0 1 0 1 Leader/follower Follower/leader 0 X 1 0 Leader Follower 0 X 1 1 Follower Leader 1 0 0 X Follower Leader 1 1 0 X Leader Follower 1 0 1 0 Configuration fault Configuration fault 1 0 1 1 Follower Leader 1 1 1 0 Leader Follower 1 1 1 1 Configuration fault Configuration fault 1 X means don't care. |
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