Hi Hal and others, I read this interesting post and I believe there is a very interesting basic question behind the topic At the end of the day it seems we are in fornt of the doubt should one follow the Appnote and/or guideline or make simulations? I have no doubt that the Appnote and guideline can be very accurate and give good suggestion but every PCB is a unique "world" where the suggestion you got from Appnote could work perfectly but could also fails. A golden rule cannot be golden enough to not be verified in your real PCB ... to make such a verification, I would say that a good simulator is the ultimate solution. Along others advantages, a direct usage of a simulator will allow to gain deep knowledge of your application and short the design cycle by an unexpected ratio. It has been demonstrated the ROI of a good simulator is practically "infinite" Giancarlo ----- Original Message ----- From: "Hal Murray" <hmurray@xxxxxxxxxxxxxxx> To: <si-list@xxxxxxxxxxxxx> Cc: "Hal Murray" <hmurray@xxxxxxxxxxxxxxx> Sent: Wednesday, November 10, 2004 5:46 AM Subject: [SI-LIST] Re: DDR SDRAM signal routing > So to answer Peter Miller's original question, convince your boss that > you'll probably save money and time in the long run if you are allowed > to do simulations ... How much does it cost for a consultant to do the simulations? (and/or sanity check) I assume the answer is "It depends", but some rough estimates and/or considerations might be helpful. -- The suespammers.org mail server is located in California. So are all my other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited commercial e-mail to my suespammers.org address or any of my other addresses. These are my opinions, not necessarily my employer's. I hate spam. ------------------------------------------------------------------ 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 ------------------------------------------------------------------ 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