AM1808_1008 Datasheet, PDF (195/264 Pages) Texas Instruments – AM1808 ARM Microprocessor

AM1808
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SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010
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.
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.
6.23.1 MDIO Registers
For a list of supported MDIO registers see Table 6-104 [MDIO Registers].
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
Table 6-104. MDIO Register Memory Map
ACRONYM
REV
CONTROL
ALIVE
LINK
LINKINTRAW
LINKINTMASKED
–
USERINTRAW
USERINTMASKED
USERINTMASKSET
USERINTMASKCLEAR
–
USERACCESS0
USERPHYSEL0
USERACCESS1
USERPHYSEL1
–
REGISTER NAME
Revision Identification Register
MDIO Control Register
MDIO PHY Alive Status Register
MDIO PHY Link Status Register
MDIO Link Status Change Interrupt (Unmasked) Register
MDIO Link Status Change Interrupt (Masked) Register
Reserved
MDIO User Command Complete Interrupt (Unmasked) Register
MDIO User Command Complete Interrupt (Masked) Register
MDIO User Command Complete Interrupt Mask Set Register
MDIO User Command Complete Interrupt Mask Clear Register
Reserved
MDIO User Access Register 0
MDIO User PHY Select Register 0
MDIO User Access Register 1
MDIO User PHY Select Register 1
Reserved
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Peripheral Information and Electrical Specifications 195
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