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LAN91C100FD bảng dữ liệu(PDF) 38 Page - SMSC Corporation |
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LAN91C100FD bảng dữ liệu(HTML) 38 Page - SMSC Corporation |
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38 / 79 page ![]() FEAST Fast Ethernet Controller with Full Duplex Capability Rev. 10/14/2002 Page 38 SMSC DS – LAN91C100FD Rev. D PRELIMINARY BANK3 OFFSET NAME TYPE SYMBOL 0 THROUGH 7 MULTICAST TABLE READ/WRITE MT LOW BYTE MULTICAST TABLE 0 0 0 0 0 0 0 0 0 HIGH BYTE MULTICAST TABLE 1 0 0 0 0 0 0 0 0 LOW BYTE MULTICAST TABLE 2 0 0 0 0 0 0 0 0 HIGH BYTE MULTICAST TABLE 3 0 0 0 0 0 0 0 0 LOW BYTE MULTICAST TABLE 4 0 0 0 0 0 0 0 0 HIGH BYTE MULTICAST TABLE 5 0 0 0 0 0 0 0 0 LOW BYTE MULTICAST TABLE 6 0 0 0 0 0 0 0 0 HIGH BYTE MULTICAST TABLE 7 0 0 0 0 0 0 0 0 The 64 bit multicast table is used for group address filtering. The hash value is defined as the six most significant bits of the CRC of the destination addresses. The three msb's determine the register to be used (MT0-MT7), while the other three determine the bit within the register. If the appropriate bit in the table is set, the packet is received. If the ALMUL bit in the RCR register is set, all multicast addresses are received regardless of the multicast table values. Hashing is only a partial group addressing filtering scheme, but being the hash value available as part of the receive status word, the receive routine can reduce the search time significantly. With the proper memory structure, the search is limited to comparing only the multicast addresses that have the actual hash value in question. BANK 3 OFFSET NAME TYPE SYMBOL 8 MANAGEMENT INTERFACE READ/WRITE MGMT HIGH BYTE FLTST MSK_ CRS100 0 0 1 1 0 0 1 1 LOW BYTE MDOE MCLK MDI MDO 0 0 1 1 0 0 MDI Pin 0 |
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