realtek single chip single port 10/100m fast ... - Cornelius-Consult
realtek single chip single port 10/100m fast ... - Cornelius-Consult
realtek single chip single port 10/100m fast ... - Cornelius-Consult
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RTL8201CL<br />
7.2 Auto-negotiation and Parallel Detection<br />
The RTL8201CL sup<strong>port</strong>s IEEE 802.3u clause 28 Auto-negotiation operation which can cooperate with other<br />
transceivers sup<strong>port</strong>ing auto-negotiation. By this mechanism, the RTL8201CL can auto detect the link partner’s<br />
ability and determine the highest speed/duplex configuration and transmit/receive in this configuration. If the link<br />
partner does not sup<strong>port</strong> Auto-negotiation, then the RTL8201CL will enable half duplex mode and enter parallel<br />
detection. The RTL8201CL will default to transmit FLP and wait for the link partner to respond. If the RTL8201CL<br />
receives FPL, then the auto-negotiation process will go on. If it receives NLP, then the RTL8201CL will change to<br />
<strong>10</strong>Mbps and half duplex mode. If it receives a <strong>10</strong>0Mbps IDLE pattern, it will change to <strong>10</strong>0Mbps and half duplex<br />
mode.<br />
To enable the auto-negotiation mode operation on the RTL8201CL, just pull the ANE pin high. And the SPEED pin<br />
and DUPLEX pin will set the ability content of auto-negotiation register. The auto-negotiation mode can be<br />
externally disabled by pulling the ANE pin low. In this case, the SPEED pin and DUXPLEX pin will change the media<br />
configuration of the RTL8201CL.<br />
Below is a list for all configurations of the ANE/SPEED/DUPLEX pins and their operation in Fiber or UTP mode.<br />
Select Medium type and interface mode to MAC<br />
FX<br />
(pin 24)<br />
MII/SNIB<br />
(pin 44)<br />
L H UTP mode and MII interface<br />
L L UTP mode and SNI interface<br />
H X Fiber mode and MII interface<br />
Operation mode<br />
UTP mode and MII interface<br />
ANE<br />
(Pin 37)<br />
SPEED<br />
(Pin 39)<br />
DUPLEX<br />
(Pin 38)<br />
Operation<br />
H L L<br />
Auto-negotiation enable, the ability field does not sup<strong>port</strong> <strong>10</strong>0Mbps and full<br />
duplex mode operation<br />
H L H Auto-negotiation enable, the ability field does not sup<strong>port</strong> <strong>10</strong>0Mbps operation<br />
H H L<br />
H H H<br />
L L L<br />
L L H<br />
L H L<br />
L H H<br />
Auto-negotiation enable, the ability field does not sup<strong>port</strong> full duplex mode<br />
operation<br />
Default setup, auto-negotiation enable, the RTL8201CL will sup<strong>port</strong> <strong>10</strong>BaseT<br />
/<strong>10</strong>0BaseTX, half/full duplex mode operation<br />
Auto-negotiation disable, force the RTL8201CL into <strong>10</strong>BaseT and half duplex<br />
mode<br />
Auto-negotiation disable, force the RTL8201CL into <strong>10</strong>BaseT and full duplex<br />
mode<br />
Auto-negotiation disable, force the RTL8201CL into <strong>10</strong>0BaseTX and half duplex<br />
mode<br />
Auto-negotiation disable, force the RTL8201CL into <strong>10</strong>0BaseTX and full duplex<br />
mode<br />
UTP mode and SNI interface<br />
SNI interface to MAC. It only works in <strong>10</strong>Base-T when the SNI interface is enabled.<br />
ANE SPEED DUPLEX<br />
Operation<br />
(Pin 37) (Pin 39) (Pin 38)<br />
X X L The duplex pin is pulled low to sup<strong>port</strong> the <strong>10</strong>Base-T half duplex<br />
function.<strong>10</strong>Base-T half duplex is the specified default mode in the SNI<br />
interface.<br />
X X H The RTL8201CL also sup<strong>port</strong>s full duplex in SNI mode. The duplex pin is<br />
pulled high to sup<strong>port</strong> <strong>10</strong>Base-T full duplex function.<br />
2002-03-29 16<br />
Rev.1.0<br />
Tel: +49(0)234-9351135 · Fax: +49(0)234-9351137 E-MAIL: info@cornelius-consult.de http://www.cornelius-consult.de
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