DESIGNERCOUNCIL Archives

May 1998

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Subject:
Clock lines...
From:
Pat Paulson <[log in to unmask]>
Reply To:
DesignerCouncil E-Mail Forum.
Date:
Fri, 15 May 1998 07:52:57 -0500
Content-Type:
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text/plain (29 lines) 
First I want to say thanks for all the replies about BGA routing. I finally
decided against all pin escapes at the part. This makes life much easier.

Next question is concerning special considerations for clock signals and
EMI.  Some of the Engineers want a ground trace surrounding the clock lines
and others say it would be better to just leave the space around the clock
line that the guard band would normally take up. The clock speeds are 40
Mhz and below using 6/6 on the inners and 8/8 on the outers. One of the 2
clock routing layers is next to the ground plane and the other layer is
next to the power plane.

All info is greatly appreciated!

Pat Paulson
VTEL Corporation
[log in to unmask]

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