Datasheet

PRODUCTPREVIEW
TMS320C6472
www.ti.com SPRS612G–JUNE 2009– REVISED JULY 2011
7.15.5 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 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 Figure 7-47.
The MDIO uses the same pins for the MII, GMII, S3MII, and RMII modes. Standalone pins are included for
the RGMII mode due to specific voltage requirements. Only one mode can be used at a time. The mode
used is selected at device reset based on the MACSEL0[2:0] configuration pins (for more detailed
information, see Section 3, Device Configuration section of this document).
For more detailed information on the EMAC/MDIO, see the TMS320C6472/TMS320TCI6486 DSP
Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) Module User's Guide
(literature number SPRUEF8).
7.15.5.1 MDIO Device-Specific Information
Clocking Information
The on-chip PLL2 and PLL2 Controller generate all the clocks to the MDIO module. When enabled, the
input clock to the PLL2 Controller (CLKIN2) must have a 25-MHz frequency. For more information, see
Section 7.9, PLL2 and PLL2 Controller of this document.
7.15.5.2 MDIO Peripheral Register Descriptions
Table 7-124. MDIO Registers
HEX ADDRESS RANGE ACRONYM REGISTER NAME
02C8 1800 VERSION MDIO Version Register
02C8 1804 CONTROL MDIO Control Register
02C8 1808 ALIVE MDIO PHY Alive Status Register
02C8 180C LINK MDIO PHY Link Status Register
02C8 1810 LINKINTRAW MDIO Link Status Change Interrupt (Unmasked) Register
02C8 1814 LINKINTMASKED MDIO Link Status Change Interrupt (Masked) Register
02C8 1818 - 02C8 181C - Reserved
02C8 1820 USERINTRAW MDIO User Command Complete Interrupt (Unmasked) Register
02C8 1824 USERINTMASKED MDIO User Command Complete Interrupt (Masked) Register
02C8 1828 USERINTMASKSET MDIO User Command Complete Interrupt Mask Set Register
02C8 182C USERINTMASKCLEAR MDIO User Command Complete Interrupt Mask Clear Register
02C8 1830 - 02C8 187C - Reserved
02C8 1880 USERACCESS0 MDIO User Access Register 0
02C8 1884 USERPHYSEL0 MDIO User PHY Select Register 0
02C8 1888 USERACCESS1 MDIO User Access Register 1
02C8 188C USERPHYSEL1 MDIO User PHY Select Register 1
02C8 1890 - 02C8 1FFC - Reserved
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