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AM79C981 数据表(PDF) 8 Page - Advanced Micro Devices |
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AM79C981 数据表(HTML) 8 Page - Advanced Micro Devices |
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8 / 40 page ![]() 1–78 Am79C981 PRELIMINARY TXD+ 0–7, TXD–0–7 Transmit Data Output 10BASE-T port differential drivers (8 ports). TXP+ 0–7, TXP–0–7 Transmit Predistortion Output 10BASE-T transmit waveform predistortion control differential outputs (8 ports). X 1 Crystal 1 Crystal Connection The internal clock generator uses a 20 MHz crystal at- tached to pins X 1 and X2. Alternatively, an external 20MHz CMOS clock signal can be used to drive this pin. X 2 Crystal 2 Crystal Connection The internal clock generator uses a 20 MHz crystal at- tached to pins X 1 and X2. If an external clock source is used, this pin should be left unconnected. |
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