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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AM79C940VCW Datenblatt(PDF) 28 Page - Advanced Micro Devices |
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AM79C940VCW Datenblatt(HTML) 28 Page - Advanced Micro Devices |
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28 / 122 page  AMD 28 Am79C940 sort of operation are bridges and routers. Lack of perfect filtering in these applications forces the CPU to be more involved in filtering and thus either slows the forwarding rates achieved or forces the use of a more powerful CPU. DTV The DTV pin is part of the host interface to the MACE device. It is used to indicate that a read or write cycle to the MACE device was successful. If DTV is not asserted at the end of a cycle, the data transfer was not success- ful. Basically, this will happen on a write to a full transmit FIFO or a read from an empty receive FIFO. In general, there are ways to ensure that a transfer is always valid and so this pin is not required in many designs. For in- stance, the TDTREQ and RDTREQ pins can be used to monitor the state of the FIFOs to ensure that data trans- fer 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 neces- sary for correct operation of the Ethernet and serves strictly as a status indication to a user. The status of the receive polarity is still available through the PHYCC register. |
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