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AM79C940VCW 数据表(PDF) 83 Page - Advanced Micro Devices |
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AM79C940VCW 数据表(HTML) 83 Page - Advanced Micro Devices |
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83 / 122 page  AMD 83 Am79C940 Attachment Unit Interface (AUI) The AUI can drive up to 50 m of standard drop cable to allow the transceiver to be remotely located, as is typi- cally the case in IEEE 803.3 10BASE5 or thick Ether- net ® installations. For a locally mounted transceiver, such as 802.3 10BASE2 or Cheapernet interface, the isolation transformer requirements between the trans- ceiver and the MACE device can be reduced. When used with the Am79C98 TPEX ™ (Twisted Pair Ethernet Transceiver), the isolation requirements of the AUI are completely removed providing that the trans- ceiver is mounted locally. For remote location of the TPEX via an AUI drop cable, the isolation requirement is necessary to meet IEEE 802.3 specifications for fault tolerance and recovery. CPU Memory Power Supply Local Bus 10BASE5/Ethernet DTE AUI Cable MAU Tap Am7996 Transceiver Ethernet Coax 16235C-14 Am79C940 AUI-10BASE5/Ethernet Example RG58 BNC “T” System CPU Local Memory 10BASE2/Cheapernet Cheapernet Coax Power Supply Am7996 Transceiver Am79C940 DMA Engine I/O Bus 16235C-15 AUI-10BASE2/Cheapernet Example |
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