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參數(shù)資料
| 型號(hào)： | RTL8309SB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SINGLE-CHIP 9-PORT 10/100MBPS SWITCH CONTROLLER |
| 中文描述： | 單芯片9口10/100Mbps開(kāi)關(guān)控制器 |
| 文件頁(yè)數(shù)： | 97/115頁(yè) |
| 文件大?。?/td> | 866K |
| 代理商： | RTL8309SB |
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RTL8309SB
Datasheet
Single-chip 9-port 10/100Mbps Switch Controller
82
Track ID: JATR-1076-21 Rev. 1.4
8.3.10. Broadcast Storm Control
After 64 consecutive broadcast packets (DID=FFFF-FFFF-FFFF) have been received by a particular port, any following
incoming broadcast packets will be discarded by this port for approximately 800ms. Any non-broadcast packet can reset the
time window and broadcast counter such that the scheme restarts.
Note: Trigger condition is consecutive 64 DID = FFFF-FFFF-FFFF packets. Release condition: receive non-broadcast packet
on or after 800ms.
8.3.11. Broadcast In/Out Drop
If some destination ports are blocking and the buffer is full, broadcast frames are dropped according to the internal
configuration. There are two options:
Broadcast Input Drop
Forwards any broadcast packet to any output port and will drop packets at the source port directly. Although this function
effectively reduces the loading on the RTL8309SB, packets broadcast to non-congested ports will also be dropped.
Broadcast Output Drop
Only forwards broadcast packets to non-congested ports. But if a dropped packet is re-transmitted by a higher protocol in the
congested port, the non-congested port will receive duplicate packets. Figure 9 illustrates this concept.
1. Input Drop: Drop the frame directly. Do not forward to any port
2. Output Drop: Forward only to non-blocking ports (broadcast becomes multicast)
Port 0 1 2 3 4 5 6 7
Rx:
Input Drop:
1. Broadcast packet from Port 0
2. Buffer of Port 7 is full, others are not full
Full
Port 0 1 2 3 4 5 6 7
Rx:
Output Drop:
Full
Figure 9. Input Drop vs. Output Drop
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