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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LAN8804 데이터시트(PDF) 76 Page - Microchip Technology |
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LAN8804 데이터시트(HTML) 76 Page - Microchip Technology |
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76 / 91 page  LAN8804 DS00003591G-page 76 © 2024 Microchip Technology Inc. and its subsidiaries 6.6.5 MDC/MDIO TIMING This section specifies the MDC/MDIO timing of the device. These timing numbers are valid for high-speed MDIO oper- ation using push-pull MDIO buffers. Note 6-19 The device can operate with MDC clock frequencies generated from bit banging in the 10s/100s of Hertz. Note 6-20 These values provide 2 ns margin beyond the IEEE specification. FIGURE 6-5: MDC/MDIO TIMING TABLE 6-18: MDC/MDIO TIMING VALUES Symbol Description Min Typ Max Units tclkp MDC period 40 — Note 6-19 ns tclkh MDC high time 10 — — ns tclkl MDC low time 10 — — ns tval MDIO (read from PHY) output valid from rising MDIO of MDC — — 20 ns tohold MDIO (read from PHY) output hold from rising edge of MDC 4 — — ns tsu MDIO (write to PHY) input setup time to rising edge of MDC 8 Note 6-20 — — ns tihold MDIO (write to PHY) input hold time after rising edge of MDC 8 Note 6-20 — — ns MDC MDIO tclkh tclkl tclkp MDIO tsu tihold (Data-Out) (Data-In) tohold |
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