| поискавой системы для электроныых деталей |
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AM79C940KC/W датащи(PDF) 29 Page - Advanced Micro Devices |
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AM79C940KC/W датащи(HTML) 29 Page - Advanced Micro Devices |
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29 / 144 page ![]() Am79C940 29 FIFO. In general, there are ways to ensure that a transfer is always valid; so this pin is not required in many designs. For instance, the TDTREQ and RDTREQ pins can be used to monitor the state of the FIFOs to ensure that data transfer only occurs at the correct times. RXPOL RXPOL is typically used to drive an LED indicating the polarity of receive frames. This function is not necessary for correct operation of the Ethernet and serves strictly as a status indication to a user. The sta- tus of the receive polarity is still available through the PHYCC register. |
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