I've been running signal integrity simulations on my board with PIC18F8621 on it for some time now and one thought hit me. Do I really need it? Is 40MHz so fast to sun signal integrity simulations? So my question is: When is it really useful to run signal integrity simulations? Thank you, Sam -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist