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STR91XF データシート(PDF) 61 Page - STMicroelectronics |
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STR91XF データシート(HTML) 61 Page - STMicroelectronics |
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61 / 72 page  STR91xF Electrical characteristics 61/72 6.13 Communication interface electrical characteristics 6.13.1 10/100 Ethernet MAC electrical characteristics VDDQ = 2.7 - 3.6V, VDD = 1.65 - 2V, TA = -40 / 85 °C unless otherwise specified. Ethernet MII Interface Timings Figure 16. MII_RX_CLK and MII_TX_CLK timing diagram Table 20. MII_RX_CLK and MII_TX_CLK timing table Figure 17. MDC timing diagram Table 21. MDC timing table Ethernet MII management timings Figure 18. Ethernet MII management timing diagram Symbol Parameter Symbol Value Unit Min Max 1 Cycle time tc(CLK) 40 ns 2 Pulse duration HIGH tHIGH(CLK) 40% 60% 3 Pulse duration LOW tLOW(CLK) 40% 60% 4 Transition time tt(CLK) 1ns Symbol Parameter Symbol Value Unit Min Max 1 Cycle time tc(MDC) 266 ns 2 Pulse duration HIGH tHIGH(MDC) 40% 60% 3 Pulse duration LOW tLOW(MDC) 40% 60% 4 Transition time tt(MDC) 1ns MII_RX_TCLK, MII_TX_CLK 1 2 3 4 4 1 2 3 4 4 MDC 1 2 3 MDC MDIO output MDIO input |
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