Texas Instruments AM18x evaluation module with Wi-Fi TMDXEVMWIFI1808L TMDXEVMWIFI1808L Datenbogen
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TMDXEVMWIFI1808L
SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014
6.23 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.
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.
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.
6.23.1 MDIO Registers
For a list of supported MDIO registers see
[MDIO Registers].
Table 6-100. MDIO Register Memory Map
BYTE ADDRESS
ACRONYM
REGISTER NAME
0x01E2 4000
REV
Revision Identification Register
0x01E2 4004
CONTROL
MDIO Control Register
0x01E2 4008
ALIVE
MDIO PHY Alive Status Register
0x01E2 400C
LINK
MDIO PHY Link Status Register
0x01E2 4010
LINKINTRAW
MDIO Link Status Change Interrupt (Unmasked) Register
0x01E2 4014
LINKINTMASKED
MDIO Link Status Change Interrupt (Masked) Register
0x01E2 4018
–
Reserved
0x01E2 4020
USERINTRAW
MDIO User Command Complete Interrupt (Unmasked) Register
0x01E2 4024
USERINTMASKED
MDIO User Command Complete Interrupt (Masked) Register
0x01E2 4028
USERINTMASKSET
MDIO User Command Complete Interrupt Mask Set Register
0x01E2 402C
USERINTMASKCLEAR
MDIO User Command Complete Interrupt Mask Clear Register
0x01E2 4030 - 0x01E2 407C
–
Reserved
0x01E2 4080
USERACCESS0
MDIO User Access Register 0
0x01E2 4084
USERPHYSEL0
MDIO User PHY Select Register 0
0x01E2 4088
USERACCESS1
MDIO User Access Register 1
0x01E2 408C
USERPHYSEL1
MDIO User PHY Select Register 1
0x01E2 4090 - 0x01E2 47FF
–
Reserved
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Peripheral Information and Electrical Specifications
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