Re: [PEDA] PCI power pins...
The way I read the PCI spec, a number of years ago when I designed a PCI board, you were REQUIRED to terminate ALL power pins on the board with a specified capacitance that could be from the power plane or capacitors if the plane wasn't enough. It read to me that you could combine pins into one capacitor, but that the capacitance had to be there for the pins. Having said that I have seen a number of boards that don't even have the power pins on the connector. I combined a few pins into fewer caps where I could and the board worked. I don't know if it would have passed the official comliancy test since only three protos were made before management abandoned the project. Robert D. LaMoreaux MTS Systems Corp. Powertrain Technology Division 4622 Runway Blvd. Ann Arbor, MI 48108 734-822-9696 Fax 734-973-1103 Main Desk 734-973- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] PCI power pins...
Hi peter, you can leave the pins floating if motherboard manu;facture terminated on baord if not you cannot leave it floating, you have to terminate with the approraite value mentioned in the pci local bus for the unused pins, usally it is terminated by the motherboard man.. itself. If any help is further required regarding in details contact my mail id Regards masthi "Protel EDA Forum" wrote: I'm using a on-board voltage regulator in order to provide power to my IC. What should I do with all the unused 3.3V and 5V pins? should I use a high freq decoupling cap of 0.01uF for each unused pin? can I tie more than one 3.3 or 5V pins and save some capacitors -> save space? I'd appreciate any help on this... Regards Peter - Do you Yahoo!? Free online calendar with sync to Outlook(TM). Get Your Private, Free E-mail from Indiatimes at http://email.indiatimes.com Buy The Best In BOOKS at http://www.bestsellers.indiatimes.com Bid for Air Tickets @ Re.1 on Air Sahara Flights. Just log on to http://airsahara.indiatimes.com and Bid Now ! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
[PEDA] PCI power pins...
I'm using a on-board voltage regulator in order to provide power to my IC. What should I do with all the unused 3.3V and 5V pins? should I use a high freq decoupling cap of 0.01uF for each unused pin? can I tie more than one 3.3 or 5V pins and save some capacitors -> save space? I'd appreciate any help on this... Regards Peter - Do you Yahoo!? Free online calendar with sync to Outlook(TM). * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
