TMS320C6472_16 Datasheet, PDF (235/269 Pages) Texas Instruments – TMS320C6472 Fixed-Point Digital Signal Processor

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TMS320C6472
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
HEX ADDRESS RANGE
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 1FFC
Table 7-124. MDIO Registers
ACRONYM
VERSION
CONTROL
ALIVE
LINK
LINKINTRAW
LINKINTMASKED
-
USERINTRAW
USERINTMASKED
USERINTMASKSET
USERINTMASKCLEAR
-
USERACCESS0
USERPHYSEL0
USERACCESS1
USERPHYSEL1
-
REGISTER NAME
MDIO Version 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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C64x+ Peripheral Information and Electrical Specifications 235
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