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| 型号： | KSZ8873MLL AM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 33/115页 |
| 文件大小： | 0K |
| 描述： | IC ETHERNET SWITCH 3PORT 64LQFP |
| 产品培训模块： | KSZ8873 Ethernet Switches |
| 标准包装： | 1,000 |
| 控制器类型： | 以太网开关控制器 |
| 接口： | MII |
| 电源电压： | 1.8V，2.5V，3.3V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP |
| 供应商设备封装： | 64-PQFP（10x10） |
| 包装： | 带卷 (TR) |
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Micrel, Inc.
KSZ8873MLL/FLL/RLL
September 20, 2013
24
Revision 1.6
LinkMD
Cable Diagnostics
KSZ8873MLL/FLL/RLL supports the LinkMD
. The LinkMD feature utilizes time domain reflectometry (TDR) to analyze
the cabling plant for common cabling problems such as open circuits, short circuits and impedance mismatches.
LinkMD
works by sending a pulse of known amplitude and duration down the MDI and MDI-X pairs and then analyzes
the shape of the reflected signal. Timing the pulse duration gives an indication of the distance to the cabling fault. Internal
circuitry displays the TDR information in a user-readable digital format.
Note: Cable diagnostics are only valid for copper connections and do not support fiber optic operation.
Access
LinkMD
is initiated by accessing the PHY special control/status registers {26, 42} and the LinkMD result registers {27, 43}
for ports 1 and 2 respectively; and in conjunction with the port registers control 13 for ports 1and 2 respectively to disable
Auto MDI/MDIX.
Alternatively, the MIIM PHY registers 0 and 29 can be used for LinkMD
access.
Usage
The following is a sample procedure for using LinkMD
with registers {42,43,45} on port 2:
1.
Disable auto MDI/MDI-X by writing a ‘1’ to Register 45, bit [2] to enable manual control over the differential pair used
to transmit the LinkMD
pulse.
2.
Start cable diagnostic test by writing a ‘1’ to Register 42, bit [4]. This enable bit is self-clearing.
3.
Wait (poll) for Register 42, bit [4] to return a ‘0’, indicating cable diagnostic test is completed.
4.
Read cable diagnostic test results in Register 42, bits [6:5]. The results are as follows:
00 = normal condition (valid test)
01 = open condition detected in cable (valid test)
10 = short condition detected in cable (valid test)
11 = cable diagnostic test failed (invalid test)
The ‘11’ case, invalid test, occurs when the KSZ8873MLL/FLL/RLL is unable to shut down the link partner. In this
instance, the test is not run, since it would be impossible for the KSZ8873MLL/FLL/RLL to determine if the detected
signal is a reflection of the signal generated or a signal from another source.
5.
Get distance to fault by concatenating Register 42, bit [0] and Register 43, bits [7:0]; and multiplying the result by a
constant of 0.4. The distance to the cable fault can be determined by the following formula:
D (distance to cable fault) = 0.4 x {( Register 26, bit [0]),(Register 27, bits [7:0])}
D (distance to cable fault) is expressed in meters.
Concatenated value of Registers 42 and 43 is converted to decimal before multiplying by 0.4.
The constant (0.4) may be calibrated for different cabling conditions, including cables with a velocity of propagation
that varies significantly from the norm.
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相关代理商/技术参数 |
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|---|---|
| KSZ8873MLL-EVAL | 功能描述:以太网开发工具 3-Port Fast Ethernet Switch with 1x MII Interface - Evaluation Board RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
| KSZ8873MLLI | 功能描述:以太网 IC 3-Port Fast Ethernet Switch with 1x RMII Interface (Industrial Grade, Lead Free) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8873MLLJ | 功能描述:以太网 IC 3-Port Fast Ethernet Switch with 1x RMII Interface (Extended Temp) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8873MML | 功能描述:以太网 IC 3-Port Fast Ethernet Switch with 2x MII Interface, Lead Free RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8873MML-EVAL | 功能描述:以太网开发工具 3-Port Fast Ethernet Switch with 2x MII Interface - Evaluation Board RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
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