hbwhelp@micrel.com or (408) 955-1690 2.3.10 Auto Nego" />
參數(shù)資料
型號: KSZ8993F
廠商: Micrel Inc
文件頁數(shù): 23/100頁
文件大小: 0K
描述: IC CONV MED 10/100 3PORT 128PQFP
標準包裝: 66
系列: *
類型: *
應用: *
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: 散裝
產(chǎn)品目錄頁面: 1081 (CN2011-ZH PDF)
其它名稱: 576-1033
Micrel, Inc.
KS8993F/FL
June 2009
29
M9999-062509
hbwhelp@micrel.com or (408) 955-1690
2.3.10 Auto Negotiation
The KS8993F conforms to the auto negotiation protocol as described by the 802.3 committee. Auto negotiation allows
UTP (Unshielded Twisted Pair) link partners to select the best common mode of operation. In auto negotiation the link
partners advertise capabilities across the link to each other. If auto negotiation is not supported or the link partner to
the KS8993F is forced to bypass auto negotiation, then the mode is set by observing the signal at the receiver. This is
known as parallel mode because while the transmitter is sending auto negotiation advertisements, the receiver is
listening for advertisements or a fixed signal protocol.
The link set up is depicted in the following flow diagram.
Figure 3: Auto Negotiation and Parallel Detection
2.4
MAC and Switch Function
2.4.1
Address Look Up
The internal look up table stores MAC addresses and their associated information. It contains a 1K uni-cast address
table plus switching information. The KS8993F is guaranteed to learn 1K addresses and distinguishes itself from hash-
based look up tables, which depending on the operating environment and probabilities, may not guarantee the absolute
number of addresses it can learn.
Start Auto Negotiation
Force Link Setting
Listen for 10BaseT Link
Pulses
Listen for 100BaseTX
Idles
Attempt Auto
Negotiation
Link Mode Set
Bypass Auto Negotiation
and Set Link Mode
Link Mode Set ?
Parallel
Operation
Join Flow
No
Yes
No
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