Scott, The revisions are [still!] not posted yet. Many of the changes are complete and we're in the publications review loop. Thanks for the reminder; I'll keep you posted. -mark -----Original Message----- From: Scott McMorrow [mailto:scott@xxxxxxxxxxxxx]=20 Sent: Thursday, September 07, 2006 2:40 PM To: Mark Alexander Cc: si-list@xxxxxxxxxxxxx Subject: Re: [SI-LIST] Re: Decoupling capacitors for BGA Mark I was wondering if you ever did update those app notes on PDS design. =20 Did I miss your SI-List post? Scott Scott McMorrow Teraspeed Consulting Group LLC 121 North River Drive Narragansett, RI 02882 (401) 284-1827 Business (401) 284-1840 Fax http://www.teraspeed.com Teraspeed(r) is the registered service mark of Teraspeed Consulting Group LLC Mark Alexander wrote: > Kishore, Subbu, > > I'll note that XAPP623 is getting a bit out-of-date. For more > up-to-date information on the latest techniques, check out the PDS > section of the Virtex-4 User Guide. Though it's not as generic as > XAPP623 (it applies specifically to the Virtex-4 device family), the > basic principles it covers apply fairly well to high-speed digital > devices and PCBs of 2006. > > I'm finishing up revisions/updates for both of these documents; will > make a post to SI-List when the new versions are published. > > -mark > > > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] > On Behalf Of Kishore Bachu > Sent: Friday, May 12, 2006 3:48 AM > To: subramanian1683@xxxxxxxxx; si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Re: Decoupling capacitors for BGA > > Classification: UNCLASSIFIED > > Hi Subramanian, > > For your reference, you can find the following article in Xilinx > website. > "Power Distribution System (PDS) Design: Using Bypass/Decoupling > Capacitors" > Xapp623.pdf > > Regards, > Kishore. > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] > On Behalf Of Subramanian R > Sent: Friday, May 12, 2006 2:32 PM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Decoupling capacitors for BGA > > Hello All, > We are using a 0.5mm Pitch 457-Pin BGA Processor. It is running at a > maximum of 532MHz. > It has 60 Power pins (Core & I/O) > > How do i place the Decoupling capacitors? > > Now we have placed all decaps (0402 pack) around the BGA (like an > island) and connected it to the VCC plane. Should i need to route it to > the individual pins itself? > > The BGA does not have much space between the Balls. So not more than 4-5 > caps can be placed right over the BGA on the other side. > > The other thing i can go for is Inter-plane capacitance. But for that > VCC-GND dielectric should be around 2-3mils, i understand. That doesn't > look possible with our PCB thickness requirements. It is a 6-layer PCB > > Thanks for any suggestions. > > Regards > Subbu > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > List FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > List technical documents are available at: > http://www.si-list.org > > List archives are viewable at: =3D3D20 > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > =3D3D20 > > > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > List FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > List technical documents are available at: > http://www.si-list.org > > List archives are viewable at: =3D20 > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > =3D20 > > > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > List FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > List technical documents are available at: > http://www.si-list.org > > List archives are viewable at: =20 > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > =20 > > =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu