參數(shù)資料
型號： KSZ8862-16MQL
廠商： Micrel Inc
文件頁數(shù)： 48/125頁
文件大小： 0K
描述： IC SWITCH 10/100 16BIT 128-PQFP
標準包裝： 66
系列： KSZ8862
控制器類型： 以太網開關控制器
接口： PCI
安裝類型： 表面貼裝
封裝/外殼： 128-BFQFP
供應商設備封裝： 128-PQFP（14x20）
包裝： 托盤
配用： 576-1638-ND - BOARD EVALUATION KSZ8862-10FL
576-1637-ND - BOARD EVALUATION KSZ8862-100FX
其它名稱： 576-1564
Micrel, Inc.
KSZ8862-16/32MQL
April 2007
29
M9999-040407-3.0
Functional Overview: MAC and Switch
Address Lookup
The internal lookup table stores MAC addresses and their associated information. It contains a 1K entry unicast address
learning table plus switching information.
The KSZ8862M is guaranteed to learn 1K addresses and distinguishes itself from hash-based look-up tables, which
depending upon the operating environment and probabilities, may not guarantee the absolute number of addresses it can
learn.
Learning
The internal lookup engine updates its table with a new entry if the following conditions are met:
1.
The received packet's Source Address (SA) does not exist in the lookup table.
2.
The received packet is good without receiving errors; the packet size is legal length.
The lookup engine inserts the qualified SA into the table, along with the port number and time stamp. If the table is full,
then the last entry of the table is deleted to make room for the new entry.
Migration
The internal look-up engine also monitors whether a station has moved. If a station has moved, it updates the table
accordingly. Migration happens when the following conditions are met:
1.
The received packet's SA is in the table but the associated source port information is different.
2.
The received packet is good without receiving errors; the packet size is legal length.
The lookup engine updates the existing record in the table with the new source port information.
Aging
The look-up engine updates the time stamp information of a record whenever the corresponding SA appears. The time
stamp is used in the aging process. If a record is not updated for a period of time, the look-up engine removes the record
from the table. The look-up engine constantly performs the aging process and continuously removes aging records. The
aging period is about 200 seconds. This feature can be enabled or disabled through Global Register SGCR1 [10].
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