TMS320DM6437
Digital Media Processor
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SPRS345B–NOVEMBER 2006–REVISED MARCH 2007
6.18 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 Documentation Support section for the
Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) Module Reference
Guide. For a list of supported registers and register fields, see Table 6-89 [MDIO Registers] in this data
manual.
6.18.1 Peripheral Register Description(s)
Table 6-89. MDIO Registers
HEX ADDRESS RANGE
0x01C8 4000
ACRONYM
–
REGISTER NAME
Reserved
0x01C8 4004
CONTROL
ALIVE
MDIO Control Register
0x01C8 4008
MDIO PHY Alive Status Register
0x01C8 400C
LINK
MDIO PHY Link Status Register
0x01C8 4010
LINKINTRAW
LINKINTMASKED
–
MDIO Link Status Change Interrupt (Unmasked) Register
MDIO Link Status Change Interrupt (Masked) Register
Reserved
0x01C8 4014
0x01C8 4018
0x01C8 4020
USERINTRAW
USERINTMASKED
USERINTMASKSET
MDIO User Command Complete Interrupt (Unmasked) Register
MDIO User Command Complete Interrupt (Masked) Register
MDIO User Command Complete Interrupt Mask Set Register
0x01C8 4024
0x01C8 4028
0x01C8 402C
USERINTMASKCLEAR MDIO User Command Complete Interrupt Mask Clear Register
0x01C8 4030 - 0x01C8 407C
0x01C8 4080
–
Reserved
USERACCESS0
USERPHYSEL0
USERACCESS1
USERPHYSEL1
–
MDIO User Access Register 0
MDIO User PHY Select Register 0
MDIO User Access Register 1
MDIO User PHY Select Register 1
Reserved
0x01C8 4084
0x01C8 4088
0x01C8 408C
0x01C8 4090 - 0x01C8 47FF
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Peripheral Information and Electrical Specifications
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