Hi Nagaraj, It sounds like you have a good start, and also some tight performance requirements. I suggest you ask your company to hire a signal integrity consultant to go through this layout with you. I can recommend Teraspeed and Mentor Graphics as two of many good companies which could help you. best regards, Stephanie Goedecke Philips - SP3D Chip Design GmbH Petersbrunnerstr.17 82319 Starnberg / Germany Phone: +49-8151-270-160 Fax : +49-8151-270-200 "Nagaraj" <nagaraj@embeddedwi To: Stephanie Goedecke/STN/SC/PHILIPS@EMEA1 reless.com> <si-list@xxxxxxxxxxxxx> Sent by: cc: si-list-bounce@free Subject: [SI-LIST] Re: 10 Layer Board Stack up lists.org Classification: 2002-12-02 10:32 AM Please respond to nagaraj Hi, Clk Speeds are 100- 150 MHz and routed in Signal Layer 1 . And Vias are Through hole ( 1 to 10 ) Via Size/ Drill Size 20/10,and 18/8 ( DSP Escape ) All Clk Lengths are About 4" And Data bus and Address Bus are Routed in Signal layer 2 and 3 Respectively Please Let me What are all the Other Inputs looking for Regards Nagaraj -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of stephanie.goedecke@xxxxxxxxxxx Sent: Monday, December 02, 2002 5:19 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: 10 Layer Board Stack up Hi, generally, the layers should be symmetrical. The details of the layout depend on the details of the board. Stephanie Goedecke Philips - SP3D Chip Design GmbH Petersbrunnerstr.17 82319 Starnberg / Germany Phone: +49-8151-270-160 Fax : +49-8151-270-200 Hi , In 10 Layer Board stack How Multiple Ground Plane Will be More effective and Why. Is there any Formula/Thumb rule behind this. most of my Critical Signal ( CLK) are Running at Signal Layer 1 and My Board Stack up is Top GND Signal Layer 1 VCC3.3 GND VCC2.5 Signal Layer 2 Signal Layer 3 GND Bottom Thanks in Advance. ------------------------------------------------------------------ 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 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 ------------------------------------------------------------------ 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 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 ------------------------------------------------------------------ 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 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