KSZ8863RLL-EVAL

Manufacturer Part NumberKSZ8863RLL-EVAL
DescriptionBOARD EVALUATION FOR KSZ8863RLL
ManufacturerMicrel Inc
KSZ8863RLL-EVAL datasheets

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Specifications of KSZ8863RLL-EVAL

Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names576-3868
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Micrel, Inc.
®
LinkMD
Cable Diagnostics
Port 2 of KSZ8863MLL/FLL/RLL supports the LinkMD
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 {42,43}, the LinkMD
registers 45, Port Control Register 13.
Alternatively, the MIIM PHY registers 0 and 29 can be used for LinkMD
Usage
The following is a sample procedure for using LinkMD
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 KSZ8863MLL/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 KSZ8863MLL/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.
Functional Overview: Power Management
The KSZ8863MLL/FLL/RLL supports a full chip hardware power down mode. When activated (pin PWRDN =0), the entire
chip is powered down.
The KSZ8863MLL/FLL/RLL can also use a single 2.5V power supply instead of 3.3V. It will save about 30% of the power
compared to 3.3V power supply.
The KSZ8863MLL/FLL/RLL supports enhanced power management feature in low power state with energy detection to
ensure low-power dissipation during device idle periods. There are five operation modes under the power management
function which is controlled by two bits in Register 195 (0xC3) and one bit in Register 29 (0x1D),45(0x2D) as shown
below:
Register 195 bit[5:4] = 00 Normal Operation Mode
Register 195 bit[5:4] = 01 Energy Detect Mode
November 2009
®.
®
The LinkMD
feature utilizes time domain reflectometry (TDR) to
®
Control/Status registers for port 2, and in conjunction with
®
access.
®
with registers {42,43,45} on port 2.
21
KSZ8863MLL/FLL/RLL
M9999-110309-1.1

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