A 5-slot CPCI system operating at 66 MHz is straight forward if you do your design carefully. I have successfully executed same on two occasions over a year ago for military aircraft upgrades (F-18 and F-22). Obey all the SI rules, use 10 Ohm series terminations (as per the PCI specification, and no termination diodes are necessary), and you will find proper settling within 5 ns for all drive strengths, and compatibility with 33 MHz cards as well. There was also a paper that demonstrated the same success presented at DesignCon99, but I don't recall the author. Respectfully, Mike Michael L. Conn Owner/Principal Consultant Mikon Consulting (408)727-5697 *** Serving Your Needs with technical Excellence *** ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu