There is no backward compatibility. You can keep 14.2 and load 15.2 and by changing your CDSROOT path you can switch between the two levels. To gain familiarity with 15.2 you may want to take some smaller designs forward. I have not lost any constraints, but diff pair constraints are a bit different. There are new properties that are added to pairs, and the pairs are grouped under the Constraint Manager. Most likely you'll need to edit that information to get back to where you were. On the positive side, the diff pair checking is better. You'll actually be able to see any points where you exceed primary gap above your allowance. The dynamic shapes are good. They do have some quirks. For some reason, my shape fill occasionally disables itself. Manual routing "feel" is different, and most important with this is that there is now a right mouse button with more options, you'll discover that if you need to modify a diff pair. Otherwise it is very much the same as 14.2 ________________________________ From: joe.piper@xxxxxxxxxxxx [mailto:joe.piper@xxxxxxxxxxxx] Sent: Wednesday, November 17, 2004 11:51 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] How do you get boards from v15 back to v14? Before I take the plunge into 15.2, what options exist for porting board files back into 14.2? Are there any other methods besides just creating a clip file of the entire design? I'm concerned about losing constraints, cam, etc. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Joe Piper Layout Design Engineer III PCB Layout CONEXANT SYSTEMS, INC. 9868 Scranton Road, Suite 1000 San Diego, CA 92121-1762 Tel 858.713.3571 Fax 858.713.4003 joe.piper@xxxxxxxxxxxx ******************Legal Disclaimer************************** "This email may contain confidential and privileged material for the sole use of the intended recipient. Any unauthorized review, use or distribution by others is strictly prohibited. If you have received the message in error, please advise the sender by reply email and delete the message. Thank you." ****************************************************************