help!

How does the am37xx chip on the beaglebone uses Ethernet??

BeagleBone does not use the AM37xx procesor. That is the BeagleBoard-xM

http://www.elinux.org/Beagleboard:BeagleBoard-xM

BeagleBone uses the AM3358 and has a MII interface that uses the internal MAC. Check the schematics.

http://www.elinux.org/Beagleboard:BeagleBoneBlack

Gerald

Read the manual !