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上传时间: 2007-08-10
详细说明： Virtual EthernetTM—also called VetherTM—gives target systems the
ability to become Ethernet communications devices without requiring
that they have Ethernet hardware. This means you can have access to
Ethernet communications speed and function during the development
cycle even when Ethernet capability will not be needed in the final
product. Vether is also useful for debugging target Ethernet hardware
and drivers.
Vether operates in a way similar to the Applied Microsystems Virtual
UART in that the target application driver is replaced with a virtual
application driver. With Vether, the target’s Ethernet driver is
replaced with the Virtual Ethernet driver. In this way, communication
between NetROM and the target is via Vether. Vether uses NetROM’s
shared memory protocols instead of sending and receiving packets
through the target Ethernet hardware, and NetROM sends and
receives target packets on its Ethernet interface. Figure 1 illustrates
this process in a logical block diagram.
The following sections in this document discuss the Vether integration
process, including the necessary steps to configure the source files and
adapt hardware. The text assumes knowledge of the Wind River
development environment, including VxWorks and the various
debugging tools. For additional information about NetROM, refer to
the NetROM User’s Manual, NetROM Installation Guide, and the
NetROM Hardware Interface Reference. ...展开收缩
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