A virtual short on the back side of the pwb  (this would require breaking up pwr and 
gnd
nets) or,
Define a split plane inclosing the pins you dont want connected which would be
associated to a phony net

JaMi Smith wrote:

> Is there a way to control the connection to Planes, or specifically forbid them, by
> defining a physical area on the Board?
>
> Is there any other method?
>
> I am thinking of a circumstance such as a BGA where I may have 1 or more connections
> which are "control" inputs to the BGA, and that as such they need to be tied either
> High (VCC) or Low (GND), but which I do not want to connect directly to the Plane in
> the middle of the Board, since I may want to "cut"  them loose from that specific
> connection during testing or at some other time.
>
> Is there any other way to do this, short of routing the connection out to a jumper
> pattern outside of the BGA?
>
> Another common area where I might want to do this is with a component where I have
> to put the Decoupling Capacitor(s) on the back side of the board, and I do not want
> the specific via that goes thru the Board to the Power Pin to connect to the Plane
> in the middle of the Board (i.e.: I want to decouple the Pin and not the Plane.)
>
> JaMi
>

--
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>John M. Cardone       Electro-Mechanical Dsgn. Engr. Grp.
>M/S 125-14R           Mechanical Engineering Section, 352
>4800 Oak Grove Dr.    NASA / Jet Propulsion Laboratory
>Pasadena, Ca 91109    MailTo:[EMAIL PROTECTED]
>Tel: 818.354.5407     Fax: 818.393.4399
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>




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