参数资料
型号: KS8993-EVAL
厂商: Micrel Inc
文件页数: 26/35页
文件大小: 0K
描述: BOARD EVAL EXPERIMENT FOR KS8993
标准包装: 1
相关产品: KS8993I-ND - IC SWITCH 10/100 3PORT 128PQFP
KS8993-ND - IC SWITCH 10/100 3PORT 128PQFP
其它名称: 576-1011
KS8993
Micrel
KS8993
32
May 2005
MLT3 Coding
For 100BaseTX operation the NRZI (Non-Return to Zero Invert on ones) signal is line coded as MLT3. The net result of using
MLT3 is to reduce the EMI (Electro Magnetic Interference) of the signal over twisted pair media. In NRZI coding, the level
changes from high to low or low to high for every “1” bit. For a “0” bit there is no transition. MLT3 line coding transitions through
three distinct levels. For every transition of the NRZI signal the MLT3 signal either increments or decrements depending on
the current state of the signal. For instance if the MLT3 level is at its lowest point the next two NRZI transitions will change the
MLT3 signal initially to the middle level followed by the highest level (second NRZI transition). On the next NRZI change, the
MLT3 level will decrease to the middle level. On the following transition of the NRZI signal the MLT3 level will move to the lowest
level where the cycle repeats. The diagram below describes the level changes. Note that in the actual 100BaseTX circuit there
is a scrambling circuit and that scrambling is not shown in this diagram.
A
3
8
E
9
4
T3
R3
I1
1010 0011 1000 1110 1001 0100 UUUU UUUU UUUU UUUU
10110101011001011100100110101001101001111111111111
Hex Value
Binary 4B
Binary 5B
NRZ
NRZI
MLT3
Figure 11. MLT3 coding
Field
Octect Length
Description
Preamble/SFD
8
Preamble and Start of Frame Delimiter
DA
6
48-bit Destination MAC Address
SA
6
48-bit Source MAC Address
802.1p tag
4
VLAN and priority tag (optional)
Length
2
Frame Length
Protocol/Data
46 to 1500
Higher Layer Protocol and Frame Data
Frame CRC
4
32-bit Cyclical Redundancy Check
ESD
1
End of Stream Delimiter
Idle
Variable
Inter Frame Idles
Table 11. MAC Frame for 802.3
The MAC (Media Access Control) fields are described in the table below.
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KS8993F-A1 功能描述:IC CONV MED 10/100 3PORT 128PQFP RoHS:否 类别:集成电路 (IC) >> 专用 IC 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:调帧器 应用:数据传输 安装类型:表面贴装 封装/外壳:400-BBGA 供应商设备封装:400-PBGA(27x27) 包装:散装
KS8993FA5 功能描述:IC SWITCH 3-PORT 10/100 128-PQFP RoHS:否 类别:集成电路 (IC) >> 专用 IC 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:调帧器 应用:数据传输 安装类型:表面贴装 封装/外壳:400-BBGA 供应商设备封装:400-PBGA(27x27) 包装:散装
KS8993F-EVAL 功能描述:EVAL KIT EXPERIMENTAL KS8993F RoHS:否 类别:编程器,开发系统 >> 评估演示板和套件 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理,电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板
KS8993FL 功能描述:IC CONV MED 10/100 SGL 128PQFP RoHS:否 类别:集成电路 (IC) >> 专用 IC 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:调帧器 应用:数据传输 安装类型:表面贴装 封装/外壳:400-BBGA 供应商设备封装:400-PBGA(27x27) 包装:散装