Management Data Input/Output (Mdio) - Texas Instruments TMS320C6474 Manual

TMS320C6474
SPRS552F – OCTOBER 2008 – REVISED JULY 2010

7.14 Management Data Input/Output (MDIO)

The Management Data Input/Output (MDIO) module implements the 802.3 serial management interface to
interrogate and controls up to 32 Ethernet PHY(s) connected to the device, using a shared two-wire bus.
Application 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 EMAC control module is the main interface between the device core processor, the MDIO module,
and the EMAC module. The relationship between these three components is shown in
For more detailed information on the EMAC/MDIO, see the TMS320C6474 DSP EMAC/MDIO Module
Reference Guide (literature number SPRUG08).
7.14.1 MDIO Peripheral Register Description(s)
The memory map of the MDIO is shown in
HEX ADDRESS
02C8 1800
02C8 1804
02C8 1808
02C8 180C
02C8 1810
02C8 1814
02C8 1818 - 02C8 181C
02C8 1820
02C8 1824
02C8 1828
02C8 182C
02C8 1830 - 02C8 187C
02C8 1880
02C8 1884
02C8 1888
02C8 188C
02C8 1890 - 02C8 1FFF
156 Peripheral Information and Electrical Specifications
Table 7-61.
Table 7-61. MDIO Registers
ACRONYM
VERSION MDIO Version 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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Figure
REGISTER NAME
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7-34.