參數(shù)資料
型號(hào)： KS8993
廠商： Micrel Inc
文件頁(yè)數(shù)： 9/35頁(yè)
文件大?。?/td> 0K
描述： IC SWITCH 10/100 3PORT 128PQFP
標(biāo)準(zhǔn)包裝： 66
系列： *
類型： *
應(yīng)用： *
安裝類型： 表面貼裝
封裝/外殼： 128-BFQFP
供應(yīng)商設(shè)備封裝： 128-PQFP（14x20）
配用： 576-1011-ND - BOARD EVAL EXPERIMENT FOR KS8993
May 2005
17
KS8993
Micrel
squelch circuit rejects signals with levels less than 400mV or with short pulse widths in order to prevent noises at the RXP or
RXM input from falsely triggering the decoder. When the input exceeds the squelch limit, the PLL locks onto the incoming signal
and the KS8993 decodes a data frame. The receiver clock is maintained active during idle periods in between data reception.
Power Management
Power Save Mode
The KS8993 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 KS8993 will shutdown most of the internal circuits to save power if there is no link.
An additional features are available:
Transmit Disable for Port 1 set external pin MUX[1] = 1 and MUX[2] = Float
Transmit Disable for Port 2 set external pin MUX[1] = 0 and MUX[2] = Float
Power Down on Port 3 set external pin MUX[1] = float and MUX[2] = 1
See
“I/O Description” section for pin description.
LED Mode Selection
Use the following table as a quick reference for setting the LED mode. See MODESEL
“I/O Description” section for
MODESEL[3:2] usage.
MODESEL[1:0]
LED[1:3]3
LED[1:3]2
LED[1:3]1
LED[1:3]0
00
Link + Act
Collision
FDX
Speed
01
RX Act
TX Act
FDX
Reserved
10
100 / Link / Act
10 / Link / Act
FDX
Collision
11
Link + Act
FDX + Collision
Reserved
Speed
Table 1. LED Mode Selection
Auto-Negotiation
The KS8993 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 KS8993 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
KS8993_09 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:3-Port 10/100 Integrated Switch with PHY and Frame Buffer
KS8993-EVAL 功能描述:BOARD EVAL EXPERIMENT FOR KS8993 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
KS8993F 功能描述:IC CONV MED 10/100 3PORT 128PQFP RoHS:是 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
KS8993F-A1 功能描述:IC CONV MED 10/100 3PORT 128PQFP 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
KS8993FA5 功能描述:IC SWITCH 3-PORT 10/100 128-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
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