KSZ8895FLXC View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
KSZ8895FLXC
Microchip Technology
'KSZ8895FLXC' PDF : 108 Pages View PDF
KSZ8895MQX/RQX/FQX/MLX
• Priority 2: 100BASE-TX, half-duplex
• Priority 3: 10BASE-T, full-duplex
• Priority 4: 10BASE-T, half-duplex
If auto-negotiation is not supported or the KSZ8895MQX/RQX/FQX/MLX link partner is forced to bypass auto-negotia-
tion, the KSZ8895MQX/RQX/FQX/MLX sets its operating mode by observing the signal at its receiver. This is known as
parallel detection, and allows the KSZ8895MQX/RQX/FQX/MLX to establish link by listening for a fixed signal protocol
in the absence of auto-negotiation advertisement protocol. The auto-negotiation link up process is shown in Figure 3-3.
FIGURE 3-3:
AUTO-NEGOTIATION FLOW CHART
START AUTO-NEGOTIATION
FORCE LINK SETTING
NO
YES
PARALLEL
OPERATION
BYPASS AUTO-NEGOTIATION
AND SET LINK MODE
ATTEMPT AUTO-
NEGOTIATION
LISTEN FOR 100BASE-TX
IDLES
LISTEN FOR 10BASE-T
LINK PULSES
NO
JOIN FLOW
LINK MODE SET?
YES
LINK MODE SET
3.1.12 LINKMD® CABLE DIAGNOSTICS
The LinkMD® feature utilizes time domain reflectometry (TDR) to analyze the cabling plant for common cabling prob-
lems 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 dig-
ital format.
Note: Cable diagnostics are only valid for copper connections and do not support fiber optic operation.
3.1.12.1 Access
LinkMD® is initiated by accessing the PHY special control/status Registers {26, 42, 58, 74, 90} and the LinkMD result
Registers {27, 43, 59, 75, 91} for ports 1, 2, 3, 4 and 5 respectively; and in conjunction with the Registers Port Control
12 and 13 for ports 1, 2, 3, 4 and 5 respectively to disable Auto-Negotiation and Auto MDI/MDI-X.
Alternatively, the MIIM PHY Registers 0 and 1d can be used for LinkMD® access also.
2016 Microchip Technology Inc.
DS00002246A-page 23
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