[PCB_FORUM] Re: AMC format

Hey, Samuel,

 

So you're saying the fingers and ESD strips should be 50u" (.00005")?  I
haven't looked at the spec. yet regarding the gold plating.

 

The spec. I'm using is "AMC.0 R1.0", dated January 3, 2005.  Are you
saying this is about to become obsolete?

 

Thanks for your help.

 

Regards,

 

Gary E. MacIndoe

PCB Design Engineer

Advanced Micro Devices

Longmont, Colorado

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Samuel Cais
Sent: Monday, October 30, 2006 10:20 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: AMC format

 

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

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