Hello and Welcome to the Intel® Embedded Community.
From your questions it seems like you are just getting started with Intel® Atom™. Let me point you to a few resources that might be useful:
Here is the User's Guide for the N450 board: http://download.intel.com/design/intarch/manuals/324421.pdf
For an introduction to Atom, there is a good book available from Intel Press, "Break Away with Intel® Atom™ Processors"
I want to make you aware of a special place to go with questions like yours. The Intel® e-Help desk is staffed by Intel representatives who support select Intel embedded platforms including Atom
To access e-Help, you need to be a Privileged member of the Intel® Embedded Community. If you are not already a Privileged member, you can request an upgrade to your community account here:
In addition to access to e-Help, Prvileged members may also access the confidential content within the Intel® Embedded Design Center, such as design documents, specifications, and training materials.
I hope this helps.
J. Felix McNulty
Community Moderator (Intel contractor)