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KSZ8765CLX-EVAL View Datasheet(PDF) - Micrel

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KSZ8765CLX-EVAL Datasheet PDF : 153 Pages
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Micrel, Inc.
KSZ8765CLX
Auto-Negotiation
The KSZ8765CLX conforms to the auto-negotiation protocol as described by the IEEE 802.3 committee. Auto-negotiation
allows unshielded twisted pair (UTP) link partners to select the highest common mode of operation. Link partners
advertise their capabilities to each other and then compare their own capabilities with those they received from their link
partners. The highest speed and duplex setting that is common to the two link partners is selected as the mode of
operation. Auto-negotiation is supported only for the copper ports.
The following list shows the speed and duplex operation mode from highest to lowest.
Highest: 100Base-TX, full-duplex
High: 100Base-TX, half-duplex
Low: 10Base-T, full-duplex
Lowest: 10Base-T, half-duplex
If auto-negotiation is not supported or the KSZ8765CLX link partner is forced to bypass auto-negotiation, the
KSZ8765CLX sets its operating mode by observing the signal at its receiver. This is known as parallel detection and
allows the KSZ8765CLX 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 the following flow chart.
July 23, 2014
Figure 5. Auto-Negotiation and Parallel Operation
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Revision 1.0
 

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