KSZ8463MLI datasheet(21/213 Pages) MICROCHIP

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 2018 Microchip Technology Inc.

DS00002642A-page 21

KSZ8463ML/RL/FML/FRL

FIGURE 3-3:

AUTO-NEGOTIATION FLOW CHART

3.1.14

LINKMD® CABLE DIAGNOSTICS

The KSZ8463 LinkMD uses 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 a

maximum distance of 200m and an accuracy of ±2m. Internal circuitry displays the TDR information in a user-readable

digital format in register P1SCSLMD[8:0] or P2SCSLMD[8:0].

Cable diagnostics are only valid for copper connections. Fiber-optic operation is not supported.

3.1.14.1

Access

LinkMD is initiated by accessing register P1SCSLMD (0x07C) or P2SCSLMD (0x094), the PHY special control/status

and LinkMD register.

START AUTO-NEGOTIATION

FORCE LINK SETTING

LISTEN FOR 10BASE-T

LINK PULSES

LISTEN FOR 100BASE-TX

IDLES

ATTEMPT AUTO-

NEGOTIATION

LINK MODE SET

BYPASS AUTO-NEGOTIATION

AND SET LINK MODE

LINK MODE SET?

PARALLEL

OPERATION

YES

JOIN FLOW

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