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AM79C940VCW 数据表(PDF) 56 Page - Advanced Micro Devices |
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AM79C940VCW 数据表(HTML) 56 Page - Advanced Micro Devices |
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56 / 122 page  AMD 56 Am79C940 data without addition of an FCS field, and the FCS will be calculated and verified at the receiver. The loopback facilities of the MACE device allow full op- eration to be verified without disturbance to the network. Loopback operation is also affected by the state of the Loopback Control bits (LOOP [0–1]) in the User Test Register. This affects whether the internal MENDEC is considered part of the internal or external loop- back path. When in the loopback mode(s), the multicast address detection feature of the MACE device, programmed by the contents of the Logical Address Filter (LADR [63–0]) can only be tested when RCVFCSE = 1, allocating the CRC generator to the receiver. All other features operate identically in loopback as in normal operation, such as automatic transmit padding and receive pad stripping. |
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