LAN8741AI-EN datasheet(65/106 Pages) MICROCHIP

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DS00001988A-page 65

LAN8741A/LAN8741Ai

4.3

MDIO Manageable Device (MMD) Registers

The device MMD registers adhere to the IEEE 802.3-2008 45.2 MDIO Interface Registers specification. The MMD reg-

isters are not memory mapped. These registers are accessed indirectly via the MMD Access Control Register and MMD

Access Address/Data Register. The supported MMD device addresses are 3 (PCS), 7 (Auto-Negotiation), and 30 (Ven-

dor Specific). Table 4-3, "MMD Registers" details the supported registers within each MMD device.

To read or write an MMD register, the following procedure must be observed:

Write the MMD Access Control Register with 00b (address) for the MMD Function field and the desired MMD

device (3 for PCS, 7 for Auto-Negotiation) for the MMD Device Address (DEVAD) field.

Write the MMD Access Address/Data Register with the 16-bit address of the desired MMD register to read/write

within the previously selected MMD device (PCS or Auto-Negotiation).

Write the MMD Access Control Register with 01b (data) for the MMD Function field and choose the previously

selected MMD device (3 for PCS, 7 for Auto-Negotiation) for the MMD Device Address (DEVAD) field.

If reading, read the MMD Access Address/Data Register, which contains the selected MMD register contents. If

writing, write the MMD Access Address/Data Register with the register contents intended for the previously

selected MMD register.

TABLE 4-3:

MMD REGISTERS

MMD Device

Address

(In Decimal)

Index

(In Decimal)

(PCS)

PCS Control 1 Register

PCS Status 1 Register

PCS MMD Devices Present 1 Register

PCS MMD Devices Present 2 Register

EEE Capability Register

EEE Wake Error Register

(Auto-Negotiation)

Auto-Negotiation MMD Devices Present 1 Register

Auto-Negotiation MMD Devices Present 2 Register

EEE Advertisement Register

EEE Link Partner Advertisement Register

(Vendor Specific)

Vendor Specific MMD 1 Device ID 1 Register

Vendor Specific MMD 1 Device ID 2 Register

Vendor Specific 1 MMD Devices Present 1 Register

Vendor Specific 1 MMD Devices Present 2 Register

Vendor Specific MMD 1 Status Register

Vendor Specific MMD 1 package ID 1 Register

Vendor Specific MMD 1 package ID 2 Register

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