Management Data Input/Output (Mdio) - Texas Instruments TMS320C6745 Manual

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6.15 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 TMS320C6745/C6747 DSP Peripherals
Overview Reference Guide. (SPRUFK9).
6.15.1 MDIO Registers
For a list of supported MDIO registers see
BYTE ADDRESS
0x01E2 4000
0x01E2 4004
0x01E2 4008
0x01E2 400C
0x01E2 4010
0x01E2 4014
0x01E2 4018
0x01E2 4020
0x01E2 4024
0x01E2 4028
0x01E2 402C
0x01E2 4030 - 0x01E2 407C
0x01E2 4080
0x01E2 4084
0x01E2 4088
0x01E2 408C
0x01E2 4090 - 0x01E2 47FF
Copyright © 2008–2014, Texas Instruments Incorporated
Table 6-40
Table 6-40. MDIO Register Memory Map
ACRONYM
REV Revision Identification Register
CONTROL MDIO Control Register
ALIVE MDIO PHY Alive Status Register
LINK MDIO PHY Link Status Register
LINKINTRAW MDIO Link Status Change Interrupt (Unmasked) Register
LINKINTMASKED MDIO Link Status Change Interrupt (Masked) Register
– Reserved
USERINTRAW MDIO User Command Complete Interrupt (Unmasked) Register
USERINTMASKED MDIO User Command Complete Interrupt (Masked) Register
USERINTMASKSET MDIO User Command Complete Interrupt Mask Set Register
USERINTMASKCLEAR MDIO User Command Complete Interrupt Mask Clear Register
– Reserved
USERACCESS0 MDIO User Access Register 0
USERPHYSEL0 MDIO User PHY Select Register 0
USERACCESS1 MDIO User Access Register 1
USERPHYSEL1 MDIO User PHY Select Register 1
– Reserved
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Product Folder Links: TMS320C6745 TMS320C6747
TMS320C6745, TMS320C6747
SPRS377F – SEPTEMBER 2008 – REVISED JUNE 2014
[MDIO Registers].
REGISTER DESCRIPTION
Peripheral Information and Electrical Specifications 117