Here is the DDR2 Standard right from JEDEC's website.
<A HREF="http://www.jedec.org/download/search/JESD79-2.pdf" target="_new">http://www.jedec.org/download/search/JESD79-2.pdf</A>
<A HREF="http://www.stompfest.com" target="_new">Stompfest Sept. 13-14 - Indy. IN</A> - Should be some good gaming!!!