KSZ8862 Micrel Semiconductor, KSZ8862 Datasheet - Page 27

• Manufacturer Part Number: KSZ8862
• Description: 2-port Ethernet Switch With Non-pci Interface And Fiber Support
• Manufacturer: Micrel Semiconductor

Auto Negotiation
The KSZ8862M conforms to the auto negotiation protocol as described by the 802.3 committee to allow the channel to
operate at 10Base-T or 100Base-TX on port 2 only.
Auto negotiation allows unshielded twisted pair (UTP) link partners to select the best common mode of operation. In auto
negotiation, the link partners advertise capabilities across the link to each other. If auto negotiation is not supported or the
link partner to the KSZ8862M is forced to bypass auto negotiation, the mode is set by observing the signal at the receiver.
This is known as parallel mode because while the transmitter is sending auto negotiation advertisements, the receiver is
listening for advertisements or a fixed signal protocol.
The link setup is shown in the following flow diagram (Figure 6).
Micrel, Inc.
April 2007
Bypass Auto Negotiation
Start Auto Negotiation
and Set Link Mode
Force Link Setting
YES
NO
Figure 6. Auto Negotiation and Parallel Operation
Attempt Auto
Negotiation
Listen for 100BASE-TX
27
Link Mode Set ?
Link Mode Set
Operation
Parallel
Idles
Join
Flow
YES
NO
Listen for 10BASE-T Link
Pulses
KSZ8862-16/32MQL
M9999-040407-3.0