Naveen, 1. Put two (one + redundant) EEPROMs on the backplane. That will hedge your bets in case you fry one of the chips. You still have responsibility to provide the right power to the device (Have you considered what will be the source of the chip power? How would you provide different power sources to each of two chips?) 2. If you have a "control" card in your backplane system, put the EEPROM on the control card. It won't give you a unique ID for the backplane, but in case you have two control cards, you can guarantee that the same chassis ID will be preserved unless both control cards are replaced. Mike ---------------------------------------------------------------- Michael Khusid Ansoft Corporation SI/HF Application Engineer 25 Burlington Mall Road, 6th floor Burlington, MA 01803-4100 Tel 781-229-8900 Ext. 134 <--- New extension Fax 781-229-8624 ---------------------http://www.ansoft.com --------------------- -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Naveen Reddy Sent: Thursday, October 16, 2003 2:53 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Active components on a highspeed backplane Dear All, Have any of you folks had any designs where you had to place an active component on the backplane? In particular, I need to have a unique 'Board ID' for each backplane and the only feasible solution I can think of is to add a Serial EEPROM; but I am a little weary of this solution because of the risk of 'frying' the chip. Using dedicated pins on connnectors is another possibility, but this is going to require more pins than I can spare. If you have had designs similar to this, I would really like to hear your thoughts on this. Regards Naveen. ------------------------------------------------------------------ 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 ------------------------------------------------------------------ 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