參數(shù)資料
型號(hào)： KS8999I
廠商： Micrel Inc
文件頁數(shù)： 14/52頁
文件大小： 0K
描述： IC SWITCH 9-PORT 10/100 208-PQFP
標(biāo)準(zhǔn)包裝： 100
系列： *
類型： *
應(yīng)用： *
安裝類型： 表面貼裝
封裝/外殼： 208-MQFP，208-PQFP
供應(yīng)商設(shè)備封裝： 208-PQFP（28x28）
包裝： 散裝
配用： 576-1023-ND - BOARD EVAL EXPERIMENT FOR KS8999
January 2005
21
KS8999
Micrel
Power Management
Power Save Mode
The KS8999 will turn off everything except for the Energy Detect and PLL circuits when the cable is not installed on an individual
port basis. In other words, the KS8999 will shutdown most of the internal circuits to save power if there is no link.
MDI/MDI-X Auto Crossover
The KS8999 supports MDI/MDI-X auto crossover. This facilitates the use of either a straight connection CAT-5 cable or a
crossover CAT-5 cable. The auto-sense function will detect remote transmit and receive pairs, and correctly assign the transmit
and receive pairs from the Micrel device. This can be highly useful when end users are unaware of cable types and can also
save on an additional uplink configuration connection.
The auto MDI/MDI-X is achieved by the Micrel device listening for the far end transmission channel and assigning transmit/
receive pairs accordingly. Auto MDI/MDI-X can be disabled by pulling the pin 87 (AUTOMDIX) to low.
Auto-Negotiation
The KS8999 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 KS8999 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 flow for the link set up is depicted below.
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
Figure 2. Auto-Negotiation
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