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AM3892 Datasheet(PDF) 201 Page - Texas Instruments |
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AM3892 Datasheet(HTML) 201 Page - Texas Instruments |
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201 / 299 page  AM3894 AM3892 www.ti.com SPRS681A – OCTOBER 2010 – REVISED MARCH 2011 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 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. 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 EMAC/MDIO chapter in the AM38x Sitara ARM Microprocessors (MPUs) Technical Reference Manual (literature number SPRUGX7). 8.6.3.1 MDIO Peripheral Register Descriptions Table 8-46. 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 - Reserved 0x4A10 081C USERINTRAW MDIO User Command Complete Interrupt (Unmasked) 0x4A10 0820 USERINTMASKED MDIO User Command Complete Interrupt (Masked) 0x4A10 0824 USERINTMASKSET MDIO User Command Complete Interrupt Mask Set 0x4A10 0828 USERINTMASKCLEAR MDIO User Command Complete Interrupt Mask Clear 0x4A10 082C - Reserved 0x4A10 0830 - 0x4A10 087C USERACCESS0 MDIO User Access 0 0x4A10 0880 USERPHYSEL0 MDIO User PHY Select 0 0x4A10 0884 USERACCESS1 MDIO User Access 1 0x4A10 0888 USERPHYSEL1 MDIO User PHY Select 1 8.6.3.2 MDIO Electrical Data/Timing Table 8-47. Timing Requirements for MDIO Input (see Figure 8-48) NO. MIN MAX UNIT 1 tc(MCLK) Cycle time, MDIO_MCLK 400 ns tw(MCLK) Pulse duration, MDIO_MCLK high or low 180 ns 4 tsu(MDIO-MCLKH) Setup time, MDIO_MDIO data input valid before MDIO_MCLK high 20 ns 5 th(MCLKH-MDIO) Hold time, MDIO_MDIO data input valid after MDIO_MCLK high 0 ns Copyright © 2010–2011, Texas Instruments Incorporated Peripheral Information and Timings 201 Submit Documentation Feedback Product Folder Link(s): AM3894 AM3892 |
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