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| 型号： | CORE10/100-RM |
| 厂商： | Microsemi SoC |
| 文件页数： | 62/106页 |
| 文件大小： | 0K |
| 描述： | IP CORE10/100 ETHERNET MAC |
| 标准包装： | 1 |
| 系列： | * |
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Software Interface
Core10100 v4.0
Receive Address Filtering
There are three kinds of addresses on the LAN: the unicast addresses, the multicast addresses, and the broadcast
addresses. If the first bit of the address (IG bit) is 0, the frame is unicast, i.e., dedicated to a single station. If the first bit
is 1, the frame is multicast, i.e., destined for a group of stations. If the address field contains all ones, the frame is
broadcast and is received by all stations on the LAN.
When Core10100 operates in perfect filtering mode, all frames are checked against the addresses in the address filtering
RAM. The unicast, multicast, and broadcast frames are treated in the same manner.
When Core10100 operates in the imperfect filtering mode, the frames with the unicast addresses are checked against a
single physical address. The multicast frames are checked using the 512-bit hash table. To receive the broadcast frame,
the hash table bit corresponding to the broadcast address CRC value must be set. Core10100 applies the standard
Ethernet CRC function to the first six bytes of the frame that contains a destination address. The least significant nine
bits of the CRC value are used to index the table. If the indexed bit is set, the frame is accepted. If this bit is cleared, the
802.3 Frame Destination Address
CRC Generator
47 0
IG
DA
47
9 8
0
Multicast
Address?
Yes
512-Bit Hash Table
Hash Table
Index
No
One Physical Address
Figure 4-15 · Filtering with One Physical Address and the Hash Table
It is important that one bit in the hash table corresponds to many Ethernet addresses. Therefore, it is possible that some
frames may be accepted by Core10100, even if they are not intended to be received. This is because some frames that
should not have been received have addresses that hash to the same bit in the table as one of the proper addresses. The
software should perform additional address filtering to reject all such frames. The receive address filtering RAM must be
enabled using the ADDRFILTER core parameter to enable the above functionality.
62
v4.0
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