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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN8804/ZMXC1 датащи(PDF) 78 Page - Microchip Technology |
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LAN8804/ZMXC1 датащи(HTML) 78 Page - Microchip Technology |
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78 / 91 page  LAN8804 DS00003591G-page 78 © 2024 Microchip Technology Inc. and its subsidiaries 6.6.7 GPIO TIMING This section specifies the general GPIO timing of the device. Note 6-21 GPIOs must have pulse widths with a minimum of two 125 MHz clocks, but no synchronous timing relationship is specified. GPIOs configured as alternate functions may have synchronous timing relationships. 6.6.8 GPIO SOF DETECTION TIMING This section specifies the GPIO SOF timing of the device. Note 6-22 8 ns for 1000BASE-T operation, 40 ns for 100BASE-TX operation, 400 ns for 10BASE-T operation. TABLE 6-20: GPIO TIMING VALUES Symbol Description Min Typ Max Units tinput_pulse GPIO input pulse width 18 — — ns toutput_pulse GPIO output pulse width 14 — — ns tinput_su GPIO input setup/hold timing N/A, treat as asynchronous (Note 6-21) toutput_hold GPIO output valid/hold timing N/A, treat as asynchronous (Note 6-21) FIGURE 6-7: GPIO SOF TIMING TABLE 6-21: GPIO SOF TIMING VALUES Symbol Description Min Typ Max Units trx_sof_lat RX SOF latency 1000M 100M 10M — 472 456 7696 — ns trx_sof RX SOF pulse width — Note 6-22 — ns trx_sof_skew RX SOF skew between GPIOs — 0.5 1 ns ttx_sof_lat TX SOF latency 1000M 100M 10M — 59 150 645 — ns ttx_sof TX SOF pulse width — Note 6-22 — ns ttx_sof_skew TX SOF skew between GPIOs — 0.5 1 ns trx_sof_lat GPIOs RX +/- trx_sof_skew GPIOs TX +/- ttx_sof_skew ttx_sof_lat |
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