Rabbit 6000 User’s Manual
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294
25.3.5 Multicast Addressing
A physical address match requires that the received frame address is a physical address that
matches every bit of the programmed receive address. A broadcast address match requires that all
48 bits of the received frame address be “ones.” A multicast address match requires the received
frame address to be a multicast address (LSB of the address is one) and a match in the multicast
address filter. The multicast address filter uses the six most significant bits of the CRC calculated
on the receive address as an index into a 64-by-1 bit table written under program control. A one in
the corresponding table entry constitutes a multicast address match as far as the network port is
concerned. A table of one set of unique multicast addresses corresponding to each filter bit is
shown below. The table shows the least significant byte of the multicast address; the remaining
five bytes of the address are all zeros for this set of multicast addresses.
Register
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
NBMF7R
0x17
0x0B
0x05
0x19
0x85
0x99
0x97
0x8B
NBMF6R
0xD9
0xC5
0xCB
0xD7
0x4B
0x57
0x59
0x45
NBMF5R
0xCF
0xD3
0xDD
0xC1
0x5D
0x41
0x4F
0x53
NBMF4R
0x01
0x1D
0x13
0x0F
0x93
0x8F
0x81
0x9D
NBMF3R
0x5F
0x43
0x4D
0x51
0xCD
0xD1
0xDF
0xC3
NBMF2R
0x91
0x8D
0x83
0x9F
0x03
0x1F
0x11
0x0D
NBMF1R
0x87
0x9B
0x95
0x89
0x15
0x09
0x07
0x1B
NBMF0R
0x49
0x55
0x5B
0x47
0xDB
0xC7
0xC9
0xD5
Содержание 6000
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