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DRA821U4...ALM 数据表(PDF) 147 Page - Texas Instruments |
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DRA821U4...ALM 数据表(HTML) 147 Page - Texas Instruments |
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147 / 252 page  NO. PARAMETER DESCRIPTION MIN TYP MAX UNIT RMII2 tw(REF_CLKH) Pulse Duration, REF_CLK High 7 13 ns RMII3 tw(REF_CLKL) Pulse Duration, REF_CLK Low 7 13 ns RMII[x]_REF_CLK RMII2 RMII3 RMII1 Figure 7-39. RMII[x]_REFCLK Timing – RMII Mode 7.9.5.2.1.2 Timing Requirements for RMII[x]_RXD[1:0], RMII[x]_CRS_DV, and RMII[x]_RXER – RMII Mode NO. PARAMETER DESCRIPTION MIN TYP MAX UNIT RMII4 tsu(RXD-REF_CLK) Setup time, RXD[1:0] valid before REF_CLK 4 ns tsu(CRS_DV-REF_CLK) Setup time, CRS_DV valid before REF_CLK 4 ns tsu(RX_ER-REF_CLK) Setup time, RX_ER valid before REF_CLK 4 ns RMII5 th(REF_CLK-RXD) Hold time RXD[1:0] valid after REF_CLK 2 ns th(REF_CLK-CRS_DV) Hold time, CRS_DV valid after REF_CLK 2 ns th(REF_CLK-RX_ER) Hold time, RX_ER valid after REF_CLK 2 ns RMII4 RMII5 RMII[x]_ _ REF CLK RMII[x]_RXD[1:0], RMII[x]_CRS_DV, RMII[x]_RX_ER Figure 7-40. RMII[x]_RXD[1:0], RMII[x]_CRS_DV, RMII[x]_RXER Timing – RMII Mode Section 7.9.5.2.1.3, and Section 7.9.5.2.1.3, present switching characteristics for CPSW2G RMII Transmit. 7.9.5.2.1.3 Switching Characteristics for RMII[x]_TXD[1:0], and RMII[x]_TXEN – RMII Mode NO. PARAMETER DESCRIPTION MIN TYP MAX UNIT RMII6 td(REF_CLK-TXD) Delay time, REF_CLK High to TXD[1:0] valid 2 10 ns td(REF_CLK-TXEN) Delay time, REF_CLK to TXEN valid 2 10 ns RMII7 tr(TXD) Rise Time, TXD Outputs 1 5 ns tr(TX_EN) Rise Time, TX_EN Output 1 5 ns RMII8 tf(TXD) Fall Time, TXD Outputs 1 5 ns tf(TX_EN) Fall Time, TX_EN Output 1 5 ns www.ti.com DRA821U-Q1 SPRSP57D – APRIL 2020 – REVISED DECEMBER 2022 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback 147 Product Folder Links: DRA821U-Q1 |
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