My personal preference is to always try and make the schematic symbol look like the physical component (same number of pins/side, same pin # sequence, etc). In this case it just does not seem practical or possible since the pins are actually an array beneath the component. I think I'm going with the partitioned symbol approach as most of you have suggested. Thanks for the help. Scott D. Riley Technical Design Service 607-658-9322 - Office 607-785-1696 - FAX www.techdesignservice.com -----Original Message----- From: James Jackson [mailto:[log in to unmask]] Sent: Tuesday, March 15, 2005 9:18 AM To: (Designers Council Forum); Scott Riley Subject: RE: [DC] Schematics for high pin count BGA devices Each one has their own preferred ways to do things... so here is another to consider. If possible - break up the device into at least 2 'blocks'. The first one can be just the 4-sided square with pins on the left and right. The second can have pins on the top and bottom. The first would be the I/O, Clock, etc. The second would be the Power and Ground pins. This would allow you to jockey the I/O pins to your hearts' content... which will sometimes change - based upon PCB layout... I.E. - if this pin moved over here, I could have a better routed board. (Also - sometimes the engineer will re-compile the FPGA's or CPLD's which could necessitate changing a logically divided 'based upon function' type of symbol - but not so with the above method.) The Power and Ground usually do not change - and can also have their respective bypass capacitors near them - making for a better visual of what capacitors go where. Even at 484 pins - this should fit on a C-Size titleblock sheet. Regards, James Jackson Oztronics -----Original Message----- From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of Scott Riley Sent: Tuesday, March 15, 2005 7:47 AM To: [log in to unmask] Subject: [DC] Schematics for high pin count BGA devices I'm looking for a little information on the best way to represent BGA components with a high pin count (EX: 484 I/O) in a schematic. I need to be able to document a schematic for a board that will have two BGA devices (484 I/O and 165 I/O). Once the customer reviews/approves the schematic I would extract a netlist and use it to create rats on the layout and for programmatic comparison. My assumption is that I will need to create symbols that have all the pins around the perimeter of a square or rectangle, but was hoping someone could share their experience on schematics for similar components and if there is a better/different approach. Scott D. Riley Technical Design Service 607-658-9322 - Office 607-785-1696 - FAX <http://www.techdesignservice.com/> www.techdesignservice.com ---------------------------------------------------------------------------- ----- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ---------------------------------------------------------------------------------