參數(shù)資料
型號: KSZ8893FQL-FX
廠商: Micrel Inc
文件頁數(shù): 45/117頁
文件大小: 0K
描述: IC SWITCH ETH 3PORT 128-PQFP
標(biāo)準(zhǔn)包裝: 66
控制器類型: 以太網(wǎng)開關(guān)控制器
接口: MII,RMII,SNI
電源電壓: 3.1 V ~ 3.5 V
工作溫度: -40°C ~ 85°C
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)
包裝: 托盤
產(chǎn)品目錄頁面: 1081 (CN2011-ZH PDF)
配用: 576-1603-ND - EVAL KIT EXPERIMENTAL KSZ8893MQL
其它名稱: 576-3273
Micrel, Inc.
KSZ8893FQL
October 2007
33
M9999-101607-1.3
LinkMD Cable Diagnostics
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 with
maximum distance of 200m and accuracy of +/- 2m. 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 registers {26,27} and {42,43}, the LinkMD Control/Status registers, for ports 1 and 2,
respectively; and in conjunction with registers 29 and 45, Port Control Register 13, for ports 1 and 2, respectively.
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 {26,27,29} on port 1.
1. Disable auto MDI/MDI-X by writing a ‘1’ to register 29, 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 26, bit [4]. This enable bit is self-clearing.
3. Wait (poll) for register 26, bit [4] to return a ‘0’; indicating cable diagnostic test is completed.
4. Read cable diagnostic test results in register 26, 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 KSZ8893FQL is unable to shut down the link partner. In this
instance, the test is not run, since it would be impossible for the KSZ8893FQL 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 26, bit [0] and register 27, 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 26 and 27 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.
For port 2 and for the MIIM PHY registers, LinkMD usage is similar.
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