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RTL8211FD-CG Datasheet(PDF) 27 Page - Realtek Semiconductor Corp. |
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RTL8211FD-CG Datasheet(HTML) 27 Page - Realtek Semiconductor Corp. |
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27 / 72 page  RTL8211F(I)/RTL8211FD(I) Datasheet Integrated 10/100/1000M Ethernet Transceiver 20 Track ID: JATR-8275-15 Rev. 1.1 7.11.4. Access to MDIO Manageable Device (MMD) The MDIO Manageable Device (MMD) is an extension to the management interface that provides the ability to access more device registers while still retaining logical compatibility with the MDIO interface, defined in section 8.1 Register Mapping and Definitions, page 29. Access to MMD configuration is provided via Registers 13 and 14. MMD Read/Write Operation 1. Write Function field to 00 (address mode) and DEVAD field to the device address value for the desired MMD (Register 13). 2. Write the desired address value to the MMD’s address register (Register 14). 3. Write Function field to 01 (data mode; no post increment) and DEVAD field to the same device address for the desired MMD (Register 13). 4. Read: Go to step 5. Write: Go to step 6. 5. Read the content of the selected register in MMD (Register 14). 6. Write the content of the selected register in MMD (Register 14). 7.12. Auto-Negotiation Auto-Negotiation is a mechanism to determine the fastest connection between two link partners. For copper media applications, it was introduced in IEEE 802.3u for Ethernet and Fast Ethernet, and then in IEEE 802.3ab to address extended functions for Gigabit Ethernet. It performs the following: • Auto-Negotiation Priority Resolution • Auto-Negotiation Master/Slave Resolution • Auto-Negotiation PAUSE/ASYMMETRIC PAUSE Resolution • Crossover Detection & Auto-Correction Resolution Upon de-assertion of a hardware reset, the RTL8211F(I)/RTL8211FD(I) can be configured to have auto-negotiation enabled, or be set to operate in 10Base-T, 100Base-TX, or 1000Base-T mode via the ANAR and GBCR register (register 4 and 9). The auto-negotiation process is initiated automatically upon any of the following: • Power-up • Hardware reset • Software reset (register 0.15) |
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