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參數(shù)資料
| 型號： | RTL8316 |
| 英文描述： | Specifications |
| 中文描述： | 規(guī)格 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大?。?/td> | 375K |
| 代理商： | RTL8316 |
RTL8316
2001/11/09
Rev.1.72
12
6.4 Address Search and Learning
The address look-up table consists of 8K entries of hash table and 128 entries of CAM. The RTL8316 uses the last 13 bits of
MAC address Direct Mapping method to index the 8K-entry look-up table for address searching and learning. If the mapped
location in the 8K entries is occupied, then the RTL8316 will compare the destination MAC address with the contents of the
CAM for address searching and store source MAC address to CAM for address learning. The 128 entry CAM can avoid the
address hash collision and will improve the switch network performance.
6.5 Address Aging
The address aging function supports the ability to keep the contents of the address table to be the most recent and correct in a
dynamic network topology. A learned source address entry will be cleared (aging out) if it is not updated by the address
learning process during an aging time period. The default aging timer of the MAC address look-up table is about 300 sec.
6.6 Illegal Frames
Illegal frames such as a bad CRC packet, runt packet (less than 64 bytes) or oversized packet (greater than 1536) will be
discarded.
6.7 802.1D Reserved Group Addresses Filtering
The RTL8316 supports the ability to enable or disable the drop frames function of the 802.1D specified reserved group MAC
addresses: 01-80-C2-00-00-03 to 01-80-C2-00-00-0F. The RTL8316 default setting will disable dropping of these reserved
group MAC address control frames. The frames with group MAC address 01-80-C2-00-00-01~2 will always be filtered.
6.8 Back off Algorithm
The RTL8316 implements the truncated exponential back off algorithm compliant to the IEEE 802.3 standard. The collision
counter will be restarted after 16 consecutive collisions.
6.9 Inter-Frame Gap
The Inter-Frame Gap is 9.6us for 10Mbps Ethernet and 960ns for 100Mbps fast Ethernet.
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