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Chapter 9
Configuration and Status
This chapter provides general guidelines for configuring and monitoring the Ethernet
MDIO Management Interface
When the optional MDIO Management Interface is selected, configuration and status of the core is achieved by the Management Registers accessed through the serial Management Data Input/Output Interface (MDIO). See “MDIO Management Interface” in Chapter 3 for more information.
MDIO Bus System
The MDIO interface for 1 Gbps operation (and slower speeds) is defined in IEEE 802.3, clause 22. This
Figure 9-1 illustrates an example MDIO bus system.
An Ethernet MAC is shown as the MDIO bus master (the Station Management (STA) entity).
Two PHY devices are shown connected to the same bus, both of which are MDIO slaves (MDIO Managed Device (MMD) entities).
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