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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN9250 датащи(PDF) 138 Page - Microchip Technology |
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LAN9250 датащи(HTML) 138 Page - Microchip Technology |
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138 / 421 page  LAN9250 DS00001913A-page 138 2015 Microchip Technology Inc. 10.4 SPI/SQI Timing Requirements Note 3: The Read instruction is limited to 30 MHz maximum Note 4: Depends on loading of 30 pF or 10 pF Note 5: Depending on the clock frequency and pulse width, data may not be valid until following the next rising edge of SCK. The host SPI controller may need to delay the sampling of the data by either a fixed time or by using the falling edge of SCK. FIGURE 10-17: SPI/SQI INPUT TIMING FIGURE 10-18: SPI/SQI OUTPUT TIMING TABLE 10-3: SPI/SQI TIMING VALUES Symbol Description Min Typ Max Units fsck SCK clock frequency Note 3 30 / 80 MHz thigh SCK high time 5.5 ns tlow SCK low time 5.5 ns tscss SCS# setup time to SCK 5ns tscsh SCS# hold time from SCK 5ns tscshl SCS# inactive time 50 ns tsu Data input setup time to SCK 3ns thd Data input hold time from SCK 4ns ton Data output turn on time from SCK 0ns tv Data output valid time from SCK Note 4, Note 5 11.0/9.0 ns tho Data output hold time from SCK 0ns tdis Data output disable time from SCS# inactive 20 ns SCK SI/SIO[3:0] SCS# tscss thigh tlow tsu thd tscshl tscsh SO/SIO[3:0] SCK thigh tlow SCS# tdis ton tv tho |
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