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KSZ9031RNX

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

Micrel, Inc.

KSZ9031RNX

Auto-Negotiation

The KSZ9031RNX conforms to the auto-negotiation protocol, defined in Clause 28 of the IEEE 802.3 Specification.

Auto-negotiation allows UTP (unshielded twisted pair) link partners to select the highest common mode-of-operation.

During auto-negotiation, link partners advertise capabilities across the UTP link 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 operating mode.

The following list shows the speed and duplex operation mode from highest-to-lowest.

• Priority 1: 1000Base-T, full-duplex

• Priority 2: 1000Base-T, half-duplex

• Priority 3: 100Base-TX, full-duplex

• Priority 4: 100Base-TX, half-duplex

• Priority 5: 10Base-T, full-duplex

• Priority 6: 10Base-T, half-duplex

If auto-negotiation is not supported or the KSZ9031RNX link partner is forced to bypass auto-negotiation for 10Base-T

and 100Base-TX modes, the KSZ9031RNX sets its operating mode by observing the input signal at its receiver. This is

known as parallel detection, and allows the KSZ9031RNX to establish a link by listening for a fixed signal protocol in the

absence of the auto-negotiation advertisement protocol.

The auto-negotiation link-up process is shown in Figure 3.

May 14, 2015

Figure 3. Auto-Negotiation Flow Chart

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Revision 2.2

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