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參數(shù)資料
| 型號(hào)： | KS8999 |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 14/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH 10/100 9PORT 208PQFP |
| 標(biāo)準(zhǔn)包裝： | 24 |
| 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 |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KS8999_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Integrated 9-Port 10/100 Switch with PHY and Frame Buffer |
| KS8999-EVAL | 功能描述:BOARD EVAL EXPERIMENT FOR KS8999 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板 |
| KS8999I | 功能描述:IC SWITCH 9-PORT 10/100 208-PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝 |
| KS9/KSE9/59/103/115 | 制造商:PEPPERL+FUCHS 功能描述:Through beam cable sensor,PNP o/p 250mm |
| KS9~11 | 制造商:Tohodenzai 功能描述: |
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