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STM32F427AI 数据表(PDF) 156 Page - STMicroelectronics |
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STM32F427AI 数据表(HTML) 156 Page - STMicroelectronics |
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156 / 240 page  Electrical characteristics STM32F427xx STM32F429xx 156/240 DS9405 Rev 12 Table 73 gives the list of Ethernet MAC signals for the RMII and Figure 48 shows the corresponding timing diagram. Figure 48. Ethernet RMII timing diagram Table 74 gives the list of Ethernet MAC signals for MII and Figure 48 shows the corresponding timing diagram. ai15667b RMII_REF_CLK RMII_TX_EN RMII_TXD[1:0] RMII_RXD[1:0] RMII_CRS_DV td(TXEN) td(TXD) tsu(RXD) tsu(CRS) tih(RXD) tih(CRS) Table 73. Dynamics characteristics: Ethernet MAC signals for RMII(1) Symbol Parameter Condition Min Typ Max Unit tsu(RXD) Receive data setup time 1.71 V < VDD < 3.6 V 1.5 - - ns tih(RXD) Receive data hold time 0 - - tsu(CRS) Carrier sense setup time 1 - - tih(CRS) Carrier sense hold time 1 - - td(TXEN) Transmit enable valid delay time 2.7 V < VDD < 3.6 V 8 10.5 12 1.71 V < VDD < 3.6 V 8 10.5 14 td(TXD) Transmit data valid delay time 2.7 V < VDD < 3.6 V 8 11 12.5 1.71 V < VDD < 3.6 V 8 11 14.5 1. Evaluated by characterization results. |
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