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AM3874 Datasheet(PDF) 236 Page - Texas Instruments |
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AM3874 Datasheet(HTML) 236 Page - Texas Instruments |
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236 / 361 page  AM3874, AM3871 SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013 www.ti.com 8.6.3 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 MDIO module implements the 802.3 serial management interface to interrogate and control Ethernet PHYs 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 SW, retrieve the negotiation results, and configure required parameters in the EMAC SW 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. A single MDIO interface is pinned out to control the PHY configuration and status monitoring. Multiple external PHYs can be controlled by the MDIO interface. For more detailed information on the MDIO peripheral, see the 3PSW Ethernet Subsystem chapter of the AM387x Sitara™ ARM Processors Technical Reference Manual (Literature Number: SPRUGZ7). 8.6.3.1 MDIO Peripheral Register Descriptions Table 8-27. MDIO Registers HEX ADDRESS ACRONYM REGISTER NAME 0x4A10 0800 VERSION MDIO Version 0x4A10 0804 CONTROL MDIO Control 0x4A10 0808 ALIVE PHY Alive Status 0x4A10 080C LINK PHY Link Status 0x4A10 0810 LINKINTRAW MDIO Link Status Change Interrupt (Unmasked) 0x4A10 0814 LINKINTMASKED MDIO Link Status Change Interrupt (Masked) 0x4A10 0818 - 0x4A10 081C - Reserved 0x4A10 0820 USERINTRAW MDIO User Command Complete Interrupt (Unmasked) 0x4A10 0824 USERINTMASKED MDIO User Command Complete Interrupt (Masked) 0x4A10 0828 USERINTMASKSET MDIO User Command Complete Interrupt Mask Set 0x4A10 082C USERINTMASKCLEAR MDIO User Command Complete Interrupt Mask Clear 0x4A10 0830 - 0x4A10 087C - Reserved 0x4A10 0880 USERACCESS0 MDIO User Access 0 0x4A10 0884 USERPHYSEL0 MDIO User PHY Select 0 0x4A10 0888 USERACCESS1 MDIO User Access 1 0x4A10 088C USERPHYSEL1 MDIO User PHY Select 1 0x4A10 0990 - 0x4A10 08FF - Reserved 8.6.3.2 MDIO Electrical Data/Timing Table 8-28. Timing Requirements for MDIO Input (see Figure 8-18) OPP100/122/166 NO. UNIT MIN MAX 1 tc(MDCLK) Cycle time, MDCLK 400 ns tw(MDCLK) Pulse duration, MDCLK high or low 180 ns 4 tsu(MDIO-MDCLKH) Setup time, MDIO data input valid before MDCLK high 20 ns 5 th(MDCLKH-MDIO) Hold time, MDIO data input valid after MDCLK high 0 ns 236 Peripheral Information and Timings Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: AM3874 AM3871 |
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