Protocol
MDIO / MII Management
Clause 22 · Clause 45
Lab ready Full lab
Management interface for Ethernet PHYs: MDC clock plus bidirectional MDIO with preamble, start, op, PHYAD, and REGAD fields. Clause 22 exposes 32 registers per PHY; Clause 45 adds MMD device addressing for multi-function and higher-speed PHYs. Link bring-up, autoneg ads, and LED/mode straps are usually configured here.
Tags
phyethernetmanagementregisters
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