Hi again: For those who never saw the PADs utility I was referring to, its advantage is probably not clear, so I will elaborate. On occasion one picks a part from the library and misses the fact that you wanted a thru-hole part and accidentally picked an SMT part. Or you specified an IC using a part number which specified the wrong temp range or tolerance. Maybe you wanted a bi-color LED with three leads and picked the part number for a two lead device. None of these are killer issues, and you would almost certainly pick them up when checking the assembly proof copies, but then what do you do about it? In PADs these were not easy to correct without deleting parts and replacing them - and that often produced strange results in the netlist when done manually. The utility in question would list every part in the design which differed in any way between the schematic and layout files. Sizes, shapes, colors, a -1 instead of a -1A in a catalog number. Whatever. Then you can select which version you want in the final data base. The utility performs a merge and reconciles all the differences automatically. Unless there is such a difference that a part has, say, a different number of pins the result was fine. No choosing forward or back annotation - just tell it to resolve the differences. Not a must have item, just a nice to have. Saves time and surprises. Roy J. Gromlich - Senior Engineer Renaissance Technologies 5000 Ritter Road Suite 202 Mechanicsburg, PA 17055 717-691-7090 > ----- Original Message ----- > From: "Olin Lathrop" > To: "Microcontroller discussion list - Public." > Sent: Friday, April 29, 2005 7:16 AM > Subject: Re: [EE]: question for EAGLE users > > > > Josh Koffman wrote: > > >> Sometimes the Schematic and the PCB get out of synch - IC4 is one > > >> thing in the Schematic and something else on the PCB. > > >> In any case, the last PADs revision I worked with had a really neat > > >> feature - it would generate a differences list between the Schematic > > >> data base and the PCB layout data base. It would analyze the data > > >> base and display, in side-by-side form, all the di > > > > > > I believe you want to do an ERC. > > > > No, only DRC (design rules check) verifies the board and schematic are > > consistant. The ERC (electrical rules check) only checks the schematic > for > > various errors like dangling power input pins, only input pins on a net, > > etc. > > > > > > ***************************************************************** > > Embed Inc, embedded system specialists in Littleton Massachusetts > > (978) 742-9014, http://www.embedinc.com > > -- > > http://www.piclist.com PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist