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LAN9220 bảng dữ liệu(PDF) 98 Page - Microchip Technology |
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LAN9220 bảng dữ liệu(HTML) 98 Page - Microchip Technology |
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98 / 142 page  LAN9220 DS00002417A-page 98 2006-2017 Microchip Technology Inc. 5.4.4 HASHH—MULTICAST HASH TABLE HIGH REGISTER The 64-bit Multicast table is used for group address filtering. For hash filtering, the contents of the destination address in the incoming frame is used to index the contents of the Hash table. The most significant bit determines the register to be used (Hi/Low), while the other five bits determine the bit within the register. A value of 00000 selects Bit 0 of the Multicast Hash Table Lo register and a value of 11111 selects the Bit 31 of the Multicast Hash Table Hi register. If the corresponding bit is 1, then the multicast frame is accepted. Otherwise, it is rejected. If the “Pass All Multicast” (MCPAS) bit is set (1), then all multicast frames are accepted regardless of the multicast hash values. The Multicast Hash Table Hi register contains the higher 32 bits of the hash table and the Multicast Hash Table Low register contains the lower 32 bits of the hash table. 5.4.5 HASHL—MULTICAST HASH TABLE LOW REGISTER This register defines the lower 32-bits of the Multicast Hash Table. Please refer to Table 5.4.4, "HASHH—Multicast Hash Table High Register" for further details. Offset: 4 Attribute: R/W Default Value: 00000000h Size: 32 bits Bits Description 31-0 Upper 32 bits of the 64-bit Hash Table Offset: 5 Attribute: R/W Default Value: 00000000h Size: 32 bits Bits Description 31-0 Lower 32 bits of the 64-bit Hash Table |
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