Hello, I master engineer student. I'm designing a program to give PCB design rules of signal integrity, I'm not a digital circuit designer. I'm looking for a high digital circuit diagram to test the program by using it to generate design rules that I can build and test. I don't want a very complex circuit, I want one with these features: small number of chips Chips easily available from suppliers Fast enough to need transmission lines Fast enough to have signal integrity problems. easily testable ( maybe receives data from PC and send results back to pC) complex enough to need a 4-6 layer board. thanks for your collaboration. JuanMa ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list 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