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| 型号： | GT-48208 |
| 厂商： | Galileo Technology Services, LLC |
| 英文描述： | Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高级交换式 10+10/100 BaseX以太网控制器) |
| 中文描述： | 先进的交换式以太网控制器的10 10/100 BaseX（高级交换式10 10/100 BaseX以太网控制器） |
| 文件页数： | 56/135页 |
| 文件大小： | 1619K |
| 代理商： | GT-48208 |
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GT-482xx Switched Ethernet Controllers for 10+10/100 BaseX
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Revision 1.2
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6.3
Address Learning Process
The GT-482xx has a self-learning mechanism for learning the MAC addresses of attached Ethernet and Fast
Ethernet devices in real time. The GT-482xx searches for the Source Address (SA) of an incoming packet in the
Address Table and acts as follows:
1.
If the SA was not found in the table (a new address) at the end of the packet, the GT-482xx updates its
Address Table. The GT-482xx can also send a New_Address message to the CPU (if present), and if
programmed to do so.
2.
If the SA was found, the GT-482xx compares the port number to the existing port number. If they are dif-
ferent and the static bit is clear, it updates the entry with the new information (and optionally notifies the
CPU). Else, no action is taken.
3.
When a source address exists in the table the Aging bit is set.
When the Static bit in the Address Table is set, the GT-482xx does not modify the entry. When both the Static and
Multiple bits are set, the GT-482xx does not modify the entry and forwards the packet as Multicast. It forwards the
packet according to the Forw bits of the Destination Address.
When two Galaxy devices managed by the same CPU are configured, the CPU may receive new address infor-
mation from both devices, since each device reports learning on its own port. The first learning is on the network
port, and the second learning is on the expansion port.
6.4
Locked Port
The CPU has the ability to lock one or more Ethernet/Fast Ethernet ports. This is done by setting the LockPort bit
in the Port Control register. In this mode, the GT-482xx does not learn any new addresses received from this port.
Ps
Source address effect on priority.
1 - enqueue to high priority queue.
Port#
Port number for this MAC address.
St
Static
1- The entry is static. The Port# can not be modified
0 - The entry can be modified
Mul
Multiple - meaning when bit St is set
1 - Forward this packet as Multicast destination address entry.
0 - Forward this packet only to the destination port.
Id
Forward to CPU only when it is Destination Addresses
1 - Forward packet to the CPU when address is Destination.
0 - no effect
Is
Forward to CPU only when it is Source Addresses
1 - Forward packet to the CPU when address is Source.
0 - no effect
MAC
48 bit of MAC address.
Forw
Forward the packet ALSO to the following ports/CPU (bit mask).
Table 6:
Address Table Entry Field Description (Continued)
Bit
General Description
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