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RTL8201CP

SINGLE-CHIP/SINGLE-PORT 10/100M FAST ETHERNET PHYCEIVER (With Auto Crossover)

Unspecified 

RTL8201CP

Datasheet

7.2. Auto-Negotiation and Parallel Detection

The RTL8201CP supports IEEE 802.3u clause 28 Auto-negotiation for operation with other transceivers

supporting auto-negotiation. The RTL8201CP 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 RTL8201CP will enable half duplex mode and enter parallel detection

mode. The RTL8201CP will default to transmit FLP (Fast Link Pulse) and wait for the link partner to

respond. If the RTL8201CP receives FLP, then the auto-negotiation process will go on. If it receives NLP

(Normal Link Pulse), then the RTL8201CP 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 RTL8201CP, just 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 RTL8201CP.

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

FX (Pin 24)

L

L

H

Table 22. Setting the Medium Type and Interface Mode to MAC

MII/SNIB (Pin 44) Operation Mode

H

UTP mode and MII interface.

L

UTP mode and SNI interface.

X

Fiber mode and MII interface.

7.2.2. UTP Mode and MII Interface

ANE

(Pin 37)

H

H

H

H

L

L

L

L

SPEED

(Pin 39)

L

L

H

H

L

L

H

H

Table 23. UTP Mode and MII Interface

DUPLEX Operation

(Pin 38)

L

Auto-negotiation enabled. The ability field does not support 100Mbps or full

duplex mode operation.

H

Auto-negotiation enabled. The ability field does not support 100Mbps

operation.

L

Auto-negotiation enabled. The ability field does not support full duplex

mode operation.

H

Default setup, auto-negotiation enabled. The RTL8201CP supports 10Base-T

/100Base-TX, half/full duplex mode operation.

L

Auto-negotiation disabled. Forces the RTL8201CP into 10Base-T and half

duplex mode.

H

Auto-negotiation disabled. Forces the RTL8201CP into 10Base-T and full

duplex mode.

L

Auto-negotiation disabled. Forces the RTL8201CP into 100Base-TX and half

duplex mode.

H

Auto-negotiation disabled. Forces the RTL8201CP into 100Base-TX and full

duplex mode.

Single-Chip/Port 10/100 Fast Ethernet PHYceiver

16

Track ID: JATR-1076-21 Rev. 1.21

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