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RTL8201CL-VD Datasheet(PDF) 22 Page - Realtek Semiconductor Corp. |
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RTL8201CL-VD Datasheet(HTML) 22 Page - Realtek Semiconductor Corp. |
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22 / 39 page  RTL8201CL Datasheet Single-Chip/Port 10/100 Fast Ethernet PHYceiver 16 Track ID: JATR-1076-21 Rev. 1.24 7.2. Auto-Negotiation and Parallel Detection The RTL8201CL supports IEEE 802.3u clause 28 Auto-negotiation for operation with other transceivers supporting auto-negotiation. The RTL8201CL can auto detect the link partner’s abilities and determine the highest speed/duplex configuration possible between the two devices. If the link partner does not support auto-negotiation, then the RTL8201CL will enable half duplex mode and enter parallel detection mode. The RTL8201CL will default to transmit FLP (Fast Link Pulse) and wait for the link partner to respond. If the RTL8201CL receives FLP, then the auto-negotiation process will go on. If it receives NLP (Normal Link Pulse), then the RTL8201CL will change to 10Mbps and half duplex mode. If it receives a 100Mbps IDLE pattern, it will change to 100Mbps and half duplex mode. To enable auto-negotiation mode operation on the RTL8201CL, pull the ANE (Auto-Negotiation Enable) pin high. The SPEED and DUPLEX pins will set the ability content of the auto-negotiation register. Auto-negotiation mode can be externally disabled by pulling the ANE pin low. In this case, the SPEED pin and DUPLEX pin will change the media configuration of the RTL8201CL. Below is a list of all configurations of the ANE/SPEED/DUPLEX pins and their operation in Fiber or UTP mode. 7.2.1. Setting the Medium Type and Interface Mode to MAC Table 22. Setting the Medium Type and Interface Mode to MAC FX (Pin 24) MII/SNIB (Pin 44) Operation Mode L H UTP mode and MII interface. L L UTP mode and SNI interface. H X Fiber mode and MII interface. 7.2.2. UTP Mode and MII Interface Table 23. UTP Mode and MII Interface ANE (Pin 37) SPEED (Pin 39) DUPLEX (Pin 38) Operation H L L Auto-negotiation enabled. The ability field does not support 100Mbps or full duplex mode operation. H L H Auto-negotiation enabled. The ability field does not support 100Mbps operation. H H L Auto-negotiation enabled. The ability field does not support full duplex mode operation. H H H Default setup, auto-negotiation enabled. The RTL8201CL supports 10Base- T /100Base-TX, half/full duplex mode operation. L L L Auto-negotiation disabled. Forces the RTL8201CL into 10Base-T and half duplex mode. L L H Auto-negotiation disabled. Forces the RTL8201CL into 10Base-T and full duplex mode. L H L Auto-negotiation disabled. Forces the RTL8201CL into 100Base-TX and half duplex mode. L H H Auto-negotiation disabled. Forces the RTL8201CL into 100Base-TX and full duplex mode. www.DataSheet4U.net |
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