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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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STM32F427AI Scheda tecnica(PDF) 155 Page - STMicroelectronics |
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STM32F427AI Scheda tecnica(HTML) 155 Page - STMicroelectronics |
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155 / 240 page  DS9405 Rev 12 155/240 STM32F427xx STM32F429xx Electrical characteristics 197 Ethernet characteristics Unless otherwise specified, the parameters given in Table 72, Table 73 and Table 74 for SMI, RMII and MII are derived from tests performed under the ambient temperature, fHCLK frequency summarized in Table 17 with the following configuration: • Output speed is set to OSPEEDRy[1:0] = 10 • Capacitive load C = 30 pF for 2.7 V < VDD < 3.6 V • Capacitive load C = 20 pF for 1.71 V < VDD < 3.6 V • Measurement points are done at CMOS levels: 0.5VDD. Refer to Section 6.3.17: I/O port characteristics for more details on the input/output characteristics. Table 72 gives the list of Ethernet MAC signals for the SMI (station management interface) and Figure 47 shows the corresponding timing diagram. Figure 47. Ethernet SMI timing diagram Table 72. Dynamics characteristics: Ethernet MAC signals for SMI(1) 1. Evaluated by characterization. Symbol Parameter Min Typ Max Unit tMDC MDC cycle time(2.38 MHz) 411 420 425 ns Td(MDIO) Write data valid time 6 10 13 tsu(MDIO) Read data setup time 12 - - th(MDIO) Read data hold time 0 - - MS31384V1 ETH_MDC ETH_MDIO(O) ETH_MDIO(I) tMDC td(MDIO) tsu(MDIO) th(MDIO) |
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