I would be interested in hearing other BGA routing strategies. Barbra > -----Original Message----- > From: Jon R. DeGenova [SMTP:[log in to unmask]] > Sent: Wednesday, May 13, 1998 2:01 PM > To: [log in to unmask] > Subject: Re: [DC] Minimum routing layers for a 256 pin BGA part with > > Pat, > > We divide the part into the four quadrants, and in each quadrant > fan toward the corner of the part. This makes for a horizontal > and a vertical routing channel (like a plus sign) through the > center of the part. > > Jon DeGenova > [log in to unmask] > > > ______________________________ Reply Separator > _________________________________ > Subject: [DC] Minimum routing layers for a 256 pin BGA part with 1.27 > Author: "DesignerCouncil E-Mail Forum." <[log in to unmask]>, > Pat > Paulson <[log in to unmask]> at Internet > Date: 5/13/98 11:59 AM > > > I'm working on my first design using a BGA part and I'm looking for any > ideas that would be helpful. I'm using a 25 mil pad for the solder ball > with pin escapes (through hole vias) for each pad. These pin escapes are > placed in the same direction so the solder side of the pcb looks like the > bga footprint for de-bug purposes. > > I guess this means I have to use 4 layers to route away from the part? Are > there any tricks that I'm missing? I'm ready to say the heck with pin > escapes at the part. What techniques do other people use? I'm using 6/6 > widths/spacing. > > Thank you for your ideas/help! > > Pat Paulson > VTEL Corp. > [log in to unmask] > > ################################################################ > DesignerCouncil E-Mail Forum provided as a free service by IPC using > LISTSERV > 1.8 c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text > in the body: > To subscribe: SUBSCRIBE DesignerCouncil <your full name> > To unsubscribe: SIGNOFF DesignerCouncil > ################################################################ > Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional > informa tion. > For the technical support contact Dmitriy Sklyar at [log in to unmask] or > 847-509-970 0 ext.311 > ################################################################ > > ################################################################ > DesignerCouncil E-Mail Forum provided as a free service by IPC using > LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE DesignerCouncil <your full name> > To unsubscribe: SIGNOFF DesignerCouncil > ################################################################ > Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional > information. > For the technical support contact Dmitriy Sklyar at [log in to unmask] or > 847-509-9700 ext.311 > ################################################################ ################################################################ DesignerCouncil E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################