# Eagle PCB duplicating parts

I've recently designed a FPGA breakout board using an FPGA BGA package, and due to the lack of packages I had on hand, I got the BGA-256 and drew new symbols and updated the connections from scratch.

Everything was spot on until I started drawing the schematic - upon a quick spot check to the PCB layout, my one BGA had turned into two identically-oriented packages with identical airwires as well as identical pin consolidation within the BGA array.

Any ideas on how to correct this issue? I cannot delete the duplicate part because if I do, I receive the "No forward-/backward-annotation can be performed!" error. Here's the schematic:

Board with "cloned" device:

So, what I was trying to do is put two pairs (four FPGAs) of FPGAs together for bitcoin mining onto a DIMM-form card that can "hot socket" into a multi-socket backplane/motherboard that carries the I/O and interface devices.

To save space and prevent from cluttering the schematic excessively, I decided to only connect pins that I determined were needed for my setup, namely the configuration and power pins and certain pins from I/O banks 0 to 3. Mapping these pins would also give me a much clearer view upon routing.

This is why the FPGA symbol in the schematic is multi-grouped and not a standard shape or size. The larger symbol to the left is a representation of the DIMM edge connector that I will build these FPGAs to. The only connection I have made at the point of screen capturing was to tie low all appropriate grounding points on the edge connector and FPGA ballout.

At first glance, because I stated I was using two pairs, having second copies may seem to make my life easier; but instead of having two pairs in parallel, I would have two doing the exact same thing.

• Alright, I just posted both the schematic and the board so you can also see the duplicated component. Read the edit; I'm in the process of writing a more detailed writeup as to what I was planning on doing with this. That, when connected with the way the board looks, will make more sense. Thanks for your help. – ecfedele Aug 13 '13 at 4:41
• I've just included the images, for the schematic it might be worth putting the devices closer together and doing a crop, images here only display as 630 x 424 pixels. – PeterJ Aug 13 '13 at 4:45
• I edited my post with a good amount of elaboration about the setup and its purpose, if anyone needs any more information run it past me and I'll provide you with whatever you need. – ecfedele Aug 13 '13 at 4:49
• IT is a common problem with PCB when you have multiple symbol components. Check out the references to all of your items, make sure you do not have the same pins assigned to 2 different symbols, that is one common problem. It is hard to see this on your schematic you attached. – FarhadA Aug 13 '13 at 9:28

• You have it pretty much spot-on - the components are marked U$1 and U$2, along the lines of the pretty-standard Eagle designators. The vertical component is the edge connector. That being said - do you think simply connecting the individual segments of the FPGA will resolve the issue? – ecfedele Aug 13 '13 at 5:28