Why do you think you have to route differneital pairs broadside coupled? I'm interpreting your statement that this means in two adjacent layers. Is that correct? > [Original Message] > From: <jain.nitin@xxxxxxxxx> > To: <leeritchey@xxxxxxxxxxxxx> > Cc: <si-list@xxxxxxxxxxxxx> > Date: 6/19/2006 6:34:31 PM > Subject: [SI-LIST] Re: 14 Layer Stackup > > > Hello Lee, > > Thanks for the information. I had thought about the stackup you just > suggested. I have a issue with this stackup. I have lot of high speed > differential nets to be routed and if I use the stackup you suggested > I'll have to route in board side coupled fashion which is not easy (in > terms of cost, reliability etc). What do you think if I have some kind > of following arrangement: > Top 1 > Signal 2 > Plane 3 Vdd1 > Signal 4 > Plane 5 Gnd > Plane 6 Vdd2 > Signal 7 > Signal 8 > Plane 9 Gnd > Plane 10 Vdd3 > Signal 11 > Plane 12 Gnd > Signal 13 > Bottom 14 > > I think you might not very comfortable with Vdd1 in layer 3. What issues > I can face if I go with above stackup. > > With regards, > Nitin > =0D > -----Original Message----- > From: Lee Ritchey [mailto:leeritchey@xxxxxxxxxxxxx]=0D > Sent: Monday, June 19, 2006 8:14 PM > To: Nitin Jain (WT01 - Broadband Networks); si-list@xxxxxxxxxxxxx > Subject: RE: [SI-LIST] 14 Layer Stackup > > Jain, > > I'd suggest you change the stackup as I have shown below. Then, I'd > make layer assignments as shown. > > > > [Original Message] > > From: <jain.nitin@xxxxxxxxx> > > To: <si-list@xxxxxxxxxxxxx> > > Date: 6/19/2006 10:01:00 AM > > Subject: [SI-LIST] 14 Layer Stackup > > > > > > Hello, > > > > We are planning to use 14 layer stackup for our design. In our stackup > > > we have total 6 planes and we are planning to use 3 planes as power=0D > > planes and hence we are left with 3 gnd planes. Now I want to know is=0D > > there any defined strategy to assign planes as pwr or gnd. In other=0D > > words which plane should be assigned as pwr and which should be=0D > > assigned as gnd.=3D0D =3D0D The 14 layer stackup looks like this: > > > > Top 1 top > > Signal 2 Signal > > Plane 3 Plane Gnd > > Signal 4 Plane Vdd1 > > Plane 5 Signal > > Plane 6 Signal > > Signal 7 Plane Gnd > > Signal 8 Plane Vdd2 > > Plane 9 Signal > > Plane 10 Signal > > Signal 11 Plane Vdd3 > > Plane 12 Plane Gnd > > Signal 13 Signal > > Bottom 14 Bottom > > > > With regards, > > Nitin > > > > > > The information contained in this electronic message and any=0D > > attachments > to=3D > > this message are intended for the exclusive use of the addressee(s)=0D > > and=3D may contain proprietary, confidential or privileged information. > > > If you=3D are not the intended recipient, you should not disseminate,=0D > > distribute > or=3D > > copy this e-mail. 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