LAN8742AI-CZ datasheet(81/124 Pages) MICROCHIP

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DS00001989A-page 81

LAN8742A/LAN8742Ai

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) and 30 (Vendor 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) 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) 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 MMD Devices Present 1 Register

PCS MMD Devices Present 2 Register

32784

Wakeup Control and Status Register (WUCSR)

32785

Wakeup Filter Configuration Register A (WUF_CFGA)

32786

Wakeup Filter Configuration Register B (WUF_CFGB)

32801

Wakeup Filter Byte Mask Registers (WUF_MASK)

32802

32803

32804

32805

32806

32807

32808

32865

MAC Receive Address A Register (RX_ADDRA)

32866

MAC Receive Address B Register (RX_ADDRB)

32867

MAC Receive Address C Register (RX_ADDRC)

32868

Miscellaneous Configuration Register (MCFGR)

(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

TDR Match Threshold Register

TDR Short/Open Threshold Register

Vendor Specific MMD 1 package ID 1 Register

Vendor Specific MMD 1 package ID 2 Register

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