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DRA821U4...ALM 数据表(PDF) 199 Page - Texas Instruments |
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DRA821U4...ALM 数据表(HTML) 199 Page - Texas Instruments |
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199 / 252 page  7.9.5.16.1.1 Legacy SDR Mode Table 7-55 and Table 7-56 present Timing requirements and Switching characteristics in MMCSD0 - Legacy SDR Mode (see Figure 7-83 and Figure 7-84). Table 7-55. MMCSD0 Timing Requirements - Legacy SDR Mode NO. PARAMETER DESCRIPTION MIN MAX UNIT LSDR1 tsu(cmdV-clkH) Setup time, MMC0_CMD valid before MMC0_CLK rising edge 2.5 ns LSDR2 th(clkH-cmdV) Hold time, MMC0_CMD valid after MMC0_CLK rising edge 6.5 ns LSDR3 tsu(dV-clkH) Setup time, MMC0_DAT[7:0] valid before MMC0_CLK rising edge 2.5 ns LSDR4 th(clkH-dV) Hold time, MMC0_DAT[7:0] valid after MMC0_CLK rising edge 6.5 ns Figure 7-83. MMCSD0 - Legacy SDR - Receive Mode Table 7-56. MMCSD0 Switching Characteristics - Legacy SDR Mode NO. PARAMETER DESCRIPTION MIN MAX UNIT fop(clk) Operating frequency, MMC0_CLK 25 MHz LSDR5 tc(clk) Cycle time, MMC0_CLK 40 ns LSDR6 tw(clkH) Pulse duration, MMC0_CLK high 18.7 ns LSDR7 tw(clkL) Pulse duration, MMC0_CLK low 18.7 ns LSDR8 td(clkL-cmdV) Delay time, MMC0_CLK falling edge to MMC0_CMD transition –3.2 3.8 ns LSDR9 td(clkL-dV) Delay time, MMC0_CLK falling edge to MMC0_DAT[7:0] transition –3.2 3.8 ns Figure 7-84. MMC0 - Legacy SDR - Transmit Mode 7.9.5.16.1.2 High Speed SDR Mode Table 7-57 and Table 7-58 present Timing requirements and Switching characteristics for MMCSD0 – High Speed SDR Mode (see Figure 7-85 andFigure 7-86 ). Table 7-57. MMCSD0 Timing Requirements - High Speed SDR Mode NO. PARAMETER DESCRIPTION MIN MAX UNIT HSSDR1 tsu(cmdV-clkH) Setup time, MMC0_CMD valid before MMC0_CLK rising edge 2.99 ns HSSDR2 th(clkH-cmdV) Hold time, MMC0_CMD valid after MMC0_CLK rising edge 2.67 ns HSSDR3 tsu(dV-clkH) Setup time, MMC0_DAT[7:0] valid before MMC0_CLK rising edge 2.99 ns HSSDR4 th(clkH-dV) Hold time, MMC0_DAT[7:0] valid after MMC0_CLK rising edge 2.67 ns www.ti.com DRA821U-Q1 SPRSP57D – APRIL 2020 – REVISED DECEMBER 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 199 Product Folder Links: DRA821U-Q1 |
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