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LAN8710AI 数据表(PDF) 76 Page - Microchip Technology |
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LAN8710AI 数据表(HTML) 76 Page - Microchip Technology |
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76 / 82 page  Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology Datasheet Revision 1.4 (08-23-12) 76 SMSC LAN8710A/LAN8710Ai DATASHEET 5.5.5.1 RMII CLKIN Requirements 5.5.6 SMI Timing This section specifies the SMI timing of the device. Please refer to Section 3.5, "Serial Management Interface (SMI)," on page 33 for additional details. Table 5.11 RMII CLKIN (REF_CLK) Timing Values PARAMETER MIN TYP MAX UNITS NOTES CLKIN frequency 50 MHz CLKIN Frequency Drift ± 50 ppm CLKIN Duty Cycle 40 60 % CLKIN Jitter 150 psec p-p – not RMS Figure 5.7 SMI Timing Table 5.12 SMI Timing Values SYMBOL DESCRIPTION MIN MAX UNITS NOTES tclkp MDC period 400 ns tclkh MDC high time 160 (80%) ns tclkl MDC low time 160 (80%) ns tval MDIO (read from PHY) output valid from rising edge of MDC 300 ns tohold MDIO (read from PHY) output hold from rising edge of MDC 0ns tsu MDIO (write to PHY) setup time to rising edge of MDC 10 ns tihold MDIO (write to PHY) input hold time after rising edge of MDC 10 ns MDC MDIO tclkh tclkl tclkp tohold MDIO tsu tihold (Data-Out) (Data-In) tohold tval |
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