Network Card User Manual

Chapter 4 Configuring Driver Parameters 29
Gigabit Forced Mode Parameter
In 10/100 mode it was possible to disable auto-negotiation and force the link to the
speed you required. With Gigabit copper interfaces this feature is also available but
may require you to decide whether your side of the connection is a master or a slave.
The link_master parameter will facilitate that. Usually switches will be enabled as
master therefore this parameter can remain unchanged, since slave operation is the
default. If this is not the case Then link_master can be used to enable ce as a
master.
Interpacket Gap Parameters
The ce device supports a programmable mode called enable_ipg0.
When a driver receives a packet with enable_ipg0 set (the default), it adds an
additional time delay before transmitting the packet. This delay, set by the ipg0
parameter, is in addition to the delay set by the ipg1 and ipg2 parameters. The
additional ipg0 delay helps to reduce collisions.
If enable_ipg0 is disabled, the value of ipg0 is ignored and no additional delay is
set. Only the delays set by ipg1 and ipg2 will be used. Disable enable_ipg0 if
other systems keep sending a large number of back-to-back packets. Systems that
have enable_ipg0 set might not have enough time on the network.
You can add the additional delay by setting the ipg0 parameter from 0 to 255, which
is the media byte time delay.
TABLE 4-4 Forced Mode Parameter
Parameter Description
link_master When set to 1 this enables master operation, assuming the link
partner is a slave.
When set to 0 this enables slave operation, assuming the link
partner is a slave. (default)