[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

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