TMS320DM641 datasheet(161/171 Pages) TI

161 / 171 page

Management Data Input/Output (MDIO)

161

June 2003 − Revised August 2004

SPRS222C

4.16

Management Data Input/Output (MDIO)

The MDIO module controls PHY configuration and status monitoring.

4.16.1

Device-Specific Information

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.

The TMS320C6000 DSP Ethernet Media Access Controller (EMAC) / Management Data Input/Output (MDIO)

Module Reference Guide (literature number SPRU628) describes the DM641/DM640 MDIO peripheral in

detail. Some of the features documented in this peripheral reference guide are not supported on the

DM641/DM640 at this time. The DM641/DM640 only supports one EMAC module. For a list of supported

registers and register fields, see Table 4−71 [MDIO Registers] in this data manual.

4.16.2

Peripheral Register Description(s)

Table 4−71. MDIO Registers

HEX ADDRESS RANGE

ACRONYM

01C8 3800

VERSION

MDIO Version Register

01C8 3804

CONTROL

MDIO Control Register

01C8 3808

ALIVE

MDIO PHY Alive Indication Register

01C8 380C

LINK

MDIO PHY Link Status Register

01C8 3810

LINKINTRAW

MDIO Link Status Change Interrupt Register