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TDA2SA Datasheet(PDF) 292 Page - Texas Instruments |
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TDA2SA Datasheet(HTML) 292 Page - Texas Instruments |
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292 / 427 page  REF_CLK (PRCM) RMII5 RMII6 rmiin_rxd1− rmin_rxer rmiin_rxd0, rmiin_crs, (inputs) SPRS8xx_GMAC_RMIIRX_05 RMII1 RMII3 RMII2 RMII4 292 TDA2SX, TDA2SG, TDA2SA TDA2HG, TDA2HV, TDA2HF, TDA2LF SPRS951F – DECEMBER 2015 – REVISED MAY 2019 www.ti.com Submit Documentation Feedback Product Folder Links: TDA2SX TDA2SG TDA2SA TDA2HG TDA2HV TDA2HF TDA2LF Timing Requirements and Switching Characteristics Copyright © 2015–2019, Texas Instruments Incorporated 7.21.3 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. Please 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 7-75, Table 7-76 and Figure 7-50 present timing requirements for GMAC RMIIn Receive. Table 7-75. 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 Table 7-76. Timing Requirements for GMAC RMIIn Receive NO. PARAMETER DESCRIPTION MIN MAX UNIT RMII5 tsu(RXD-REF_CLK) Setup time, receive selected signals valid before REF_CLK 4 ns tsu(CRS_DV-REF_CLK) tsu(RX_ER-REF_CLK) RMII6 th(REF_CLK-RXD) Hold time, receive selected signals valid after REF_CLK 2 ns th(REF_CLK-CRS_DV) th(REF_CLK-RX_ER) Figure 7-50. GMAC Receive Interface Timing RMIIn operation Table 7-77, Table 7-77 and Figure 7-51 present switching characteristics for GMAC RMIIn Transmit 10/100Mbit/s. Table 7-77. Switching Characteristics Over Recommended Operating Conditions for GMAC REF_CLK - RMII Operation NO. PARAMETER DESCRIPTION MIN MAX UNIT RMII7 tc(REF_CLK) Cycle time, REF_CLK 20 ns RMII8 tw(REF_CLKH) Pulse duration, REF_CLK high 7 13 ns |
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