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DRA821U4...ALM 数据表(PDF) 212 Page - Texas Instruments |
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DRA821U4...ALM 数据表(HTML) 212 Page - Texas Instruments |
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212 / 252 page  NO.(1) PARAMETER DESCRIPTION MODE MIN MAX UNIT O5 td(CLK-CSn) Delay time, CLK rising edge to CSn inactive edge 1.8V, OSPI0 DDR TX; 1.8V, OSPI1 DDR TX -7+0.475 * P + 0.975 * N * R (3) (4) (5) 0.525 * P + 1.025 * N * R + 1 (3) (4) (5) ns 3.3V, OSPI0 DDR TX; 3.3V, OSPI1 DDR TX -7+0.475 * P + 0.975 * N * R (3) (4) (5) 0.525 * P + 1.025 * N * R + 1 (3) (4) (5) ns O6 td(CLK-D) Delay time, CLK active edge to D[i:0] transition 1.8V, OSPI0 DDR TX; 1.8V, OSPI1 DDR TX -7.7 -1.56 ns 3.3V, OSPI0 DDR TX; 3.3V, OSPI1 DDR TX -7.7 -1.56 ns (1) i in [i:0] = 7 for OSPI0, i in [i:0] = 3 for OSPI1 (2) P = CLK cycle time (3) P = SCLK period (4) M = OSPI_DEV_DELAY_REG[D_INIT_FLD], N = OSPI_DEV_DELAY_REG[D_AFTER_FLD] (5) R = refclk OSPI_CLK OSPI_TIMING_01 OSPI_CSn O6 O3 O2 O1 O5 OSPI_D[i:0] O6 O4 Figure 7-104. OSPI Switching Characteristics – DDR 7.9.5.18.2.2 OSPI Switching Characteristics – SDR Mode NO.(1) PARAMETER DESCRIPTION MODE MIN MAX UNIT O7 tc(CLK) Cycle time, CLK 1.8V 7 ns 3.3V 7.52 ns O8 tw(CLKL) Pulse duration, CLK low -0.3+0.475*P (2) ns O9 tw(CLKH) Pulse duration, CLK high -0.3+0.475*P (2) ns O10 td(CLK-CSn) Delay time, CSn[3:0] active edge to CLK rising edge 1.8V -1-0.475 * P – 0.975 * N * R (3) (4) (5) 0.525 * P + 1.025 * M * R + 1 (3) (4) (5) ns 3.3V -1-0.475 * P – 0.975 * N * R (3) (4) (5) 0.525 * P + 1.025 * M * R + 1 (3) (4) (5) ns O11 td(CLK-CSn) Delay time, CLK rising edge to CSn inactive edge 1.8V -1+0.475 * P + 0.975 * N * R (3) (4) (5) 0.525 * P + 1.025 * N * R + 1(3) (4) (5) ns 3.3V -1+0.475 * P + 0.975 * N * R (3) (4) (5) 0.525 * P + 1.025 * N * R + 1 (3) (4) (5) ns O12 td(CLK-D) Delay time, CLK active edge to D[i:0] transition 1.8V -1.15 1.25 ns 3.3V -1.33 1.51 ns (1) i in [i:0] = 7 for OSPI0, i in [i:0] = 3 for OSPI1 (2) P = CLK cycle time DRA821U-Q1 SPRSP57D – APRIL 2020 – REVISED DECEMBER 2022 www.ti.com 212 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: DRA821U-Q1 |
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