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AM5728 Datasheet(PDF) 311 Page - Texas Instruments |
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AM5728 Datasheet(HTML) 311 Page - Texas Instruments |
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311 / 415 page  1 MDIO4 MDIO5 MDIO7 MDIO2 MDIO3 MDIO6 MDIO6 MDCLK MDIO (input) MDIO (output) 311 AM5729, AM5728, AM5726 www.ti.com SPRS953F – DECEMBER 2015 – REVISED MAY 2019 Submit Documentation Feedback Product Folder Links: AM5729 AM5728 AM5726 Timing Requirements and Switching Characteristics Copyright © 2015–2019, Texas Instruments Incorporated Figure 7-55. GMAC MDIO diagrams In Table 7-75 are presented the specific groupings of signals (IOSET) for use with GMAC MDIO signals. Table 7-75. GMAC MDIO IOSETs SIGNALS IOSET7 IOSET8 IOSET9 IOSET10 BALL MUX BALL MUX BALL MUX BALL MUX mdio_d F6 3 U4 0 AB4 1 B20 5 mdio_mclk D3 3 V1 0 AC5 1 B21 5 7.22.3 GMAC RMII Timings The main reference clock REF_CLK (RMII_50MHZ_CLK) of RMII interface is internally supplied from PRCM. The source of this clock could be either externally sourced from the RMII_MHZ_50_CLK pin of the device or internally generated from DPLL_GMAC output clock GMAC_RMII_HS_CLK. See the PRCM chapter of the device TRM for full details about RMII reference clock. CAUTION The IO Timings provided in this section are only valid for some GMAC usage modes when the corresponding Virtual IO Timings or Manual IO Timings are configured as described in the tables found in this section. Table 7-76, Table 7-77 and Figure 7-56 present timing requirements for GMAC RMIIn Receive. Table 7-76. Timing Requirements for GMAC REF_CLK - RMII Operation NO. PARAMETER DESCRIPTION MIN MAX UNIT RMII1 tc(REF_CLK) Cycle time, REF_CLK 20 ns RMII2 tw(REF_CLKH) Pulse duration, REF_CLK high 7 13 ns RMII3 tw(REF_CLKL) Pulse duration, REF_CLK low 7 13 ns RMII4 ttt(REF_CLK) Transistion time, REF_CLK 3 ns |
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