LAN9250 datasheet(263/421 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001913A-page 263

LAN9250

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 PHY MMD Access Control Register

(PHY_MMD_ACCESS) and PHY MMD Access Address/Data Register (PHY_MMD_ADDR_DATA). The supported

MMD device addresses are 3 (PCS), 7 (Auto-Negotiation), and 30 (Vendor Specific). Table 12-15, "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 PHY MMD Access Control Register (PHY_MMD_ACCESS) 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 PHY MMD Access Address/Data Register (PHY_MMD_ADDR_DATA) with the 16-bit address of the

desired MMD register to read/write within the previously selected MMD device (PCS or Auto-Negotiation).

TABLE 12-15: MMD REGISTERS

MMD DEVICE

ADDRESS

(IN DECIMAL)

INDEX

(IN DECIMAL)

(PCS)

PHY PCS Control 1 Register (PHY_PCS_CTL1)

PHY PCS Status 1 Register (PHY_PCS_STAT1)

PHY PCS MMD Devices Present 1 Register

(PHY_PCS_MMD_PRESENT1)

PHY PCS MMD Devices Present 2 Register

(PHY_PCS_MMD_PRESENT2)

PHY EEE Capability Register (PHY_EEE_CAP)

PHY EEE Wake Error Register (PHY_EEE_WAKE_ERR)

(Auto-Negotiation)

PHY Auto-Negotiation MMD Devices Present 1 Register (PHY_AN_M-

MD_PRESENT1)

PHY Auto-Negotiation MMD Devices Present 2 Register (PHY_AN_M-

MD_PRESENT2)

PHY EEE Advertisement Register (PHY_EEE_ADV)

PHY EEE Link Partner Advertisement Register (PHY_EEE_LP_ADV)

(Vendor Specific)

PHY Vendor Specific MMD 1 Device ID 1 Register

(PHY_VEND_SPEC_MMD1_DEVID1)

PHY Vendor Specific MMD 1 Device ID 2 Register

(PHY_VEND_SPEC_MMD1_DEVID2)

PHY Vendor Specific MMD 1 Devices Present 1 Register

(PHY_VEND_SPEC_MMD1_PRESENT1)

PHY Vendor Specific MMD 1 Devices Present 2 Register

(PHY_VEND_SPEC_MMD1_PRESENT2)

PHY Vendor Specific MMD 1 Status Register (PHY_VEND_SPEC_M-

MD1_STAT)

PHY Vendor Specific MMD 1 Package ID 1 Register

(PHY_VEND_SPEC_MMD1_PKG_ID1)

PHY Vendor Specific MMD 1 package ID 2 Register

(PHY_VEND_SPEC_MMD1_PKG_ID2)

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