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TMS320DM6446

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SPRS283H – DECEMBER 2005 – REVISED SEPTEMBER 2010

6.21 Management Data Input/Output (MDIO)

The Management Data Input/Output (MDIO) module continuously polls all 32 MDIO addresses in order to

enumerate all PHY devices in the system.

The Management Data Input/Output (MDIO) module implements the 802.3 serial management interface to

interrogate and control Ethernet PHY(s) using a shared two-wire bus. Host software uses the MDIO

module to configure the auto-negotiation parameters of each PHY attached to the EMAC, retrieve the

negotiation results, and configure required parameters in the EMAC module for correct operation. The

module is designed to allow almost transparent operation of the MDIO interface, with very little

maintenance from the core processor. Only one PHY may be connected at any given time.

For more detailed information on the MDIO peripheral, see the TMS320DM644x DMSoC Ethernet Media

Access Controller (EMAC)/ Management Data Input/Output (MDIO) Module User's Guide (literature

number SPRUE24). For a list of supported registers and register fields, see Table 6-98 [MDIO Registers]

in this data manual.

6.21.1

Peripheral Register Description(s)

Table 6-98. MDIO Registers

HEX ADDRESS RANGE

ACRONYM

0x01C8 4000

–

Reserved

0x01C8 4004

CONTROL

MDIO Control Register

0x01C8 4008

ALIVE

MDIO PHY Alive Status Register

0x01C8 400C

LINK

MDIO PHY Link Status Register

0x01C8 4010

LINKINTRAW

MDIO Link Status Change Interrupt (Unmasked) Register

0x01C8 4014

LINKINTMASKED

MDIO Link Status Change Interrupt (Masked) Register

0x01C8 4018

–

Reserved

0x01C8 4020

USERINTRAW

MDIO User Command Complete Interrupt (Unmasked) Register

0x01C8 4024

USERINTMASKED

MDIO User Command Complete Interrupt (Masked) Register

0x01C8 4028

USERINTMASKSET

MDIO User Command Complete Interrupt Mask Set Register

0x01C8 402C

USERINTMASKCLEAR

MDIO User Command Complete Interrupt Mask Clear Register

0x01C8 4030 - 0x01C8 407C

–

Reserved

0x01C8 4080

USERACCESS0

MDIO User Access Register 0

0x01C8 4084

USERPHYSEL0

MDIO User PHY Select Register 0

0x01C8 4088

USERACCESS1

MDIO User Access Register 1

0x01C8 408C

USERPHYSEL1

MDIO User PHY Select Register 1

0x01C8 4090 - 0x01C8 47FF

–

Reserved

Peripheral and Electrical Specifications

211

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