TMS320DM642 datasheet(159/178 Pages) TI

159 / 178 page

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5.17

Management Data Input/Output (MDIO)

5.17.1

Device-Specific Information

5.17.2

Peripheral Register Description(s)

TMS320DM642

Video/Imaging Fixed-Point Digital Signal Processor

SPRS200J – JULY 2002 – REVISED AUGUST 2005

The MDIO module controls PHY configuration and status monitoring.

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 DM642 MDIO peripheral in

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

DM642 at this time. The DM642 only supports one EMAC module. For a list of supported registers and

Table 5-78. 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

MDIO Link Status Change Interrupt Register

01C8 3810

LINKINTRAW