Gary, I think the fingers and the esd strip should be hard gold with a min of 50u. The dimension from the edge of the board to the fingers is important and hard to respect. I also tought that the round cut out for the edge connector and the chamfer are about to change so I would recommend you to check this with the spec. Samuel Samuel CAIS Interphase Corporation CAD PCB Designer 2901 N. Dallas Parkway #200 cais@xxxxxxxxxx Plano, TX 75093 214.654.5337 www.Interphase.com ________________________________ From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Peter Hughes Sent: Monday, October 30, 2006 11:06 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] Re: AMC format Hello Gary, We have done a few of these boards and the way we do the edge connector is to build each finger as two pads. Referencing your diagram below the pads that are on the left of each finger are a mechanical pad with no connection but the pads on the right are a connected pad with the pin number. As for the gold fingers a selective plating process was used. Rgrds Peter Hughes, PCB Designer, Concurrent Technologies, 4 Gilberd Close, Newcomen Way, Colchester, Essex, CO4 4WN. Tel: +44 1206 752626 Fax: +44 1206 751116 -----Original Message----- From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary Sent: 30 October 2006 16:41 To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] AMC format Hey guys, I'm doing an Advanced Mezzanine Card (AMC) format design and have a few questions. This format has an edge connector on one end with a strange contact pattern. As opposed to the normal (i.e. PCI) edge connector fingers (all the same), this format has some two part fingers that connect sooner or later than others (see diagram below). My first question is about creating the pads/symbol for this edge connector: as far as the two part padstack fingers (Second, Third & Last Mates), how would you create them? My second question is concerning gold plating this strange finger pattern. It seems to me that the only way is "selective plating", as opposed to the normal edge connector plating process, correct? We're in a state of flux right now, not sure which fab house to ask, so I thought I'd ping you guys. Thanks for any responses! Gary E. MacIndoe PCB Design Engineer Advanced Micro Devices Longmont, Colorado