Cyclone III or IV footprints

Hi,

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did turning on the Device Migration feature not result in an accurate .pin file?

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I was taking a more system-level approach in that I wanted to make sure I could physically layout the PCB with decoupling capacitors, termination resistors, and stuff-resistors soldered directly on the BGA vias on the bottom of the board using via-in-pads. Because I always needed a GND via next to a power pin, or next to a VREF pin, I had to look carefully at the BGA package and the fixed pin functions, to decide where I wanted to assign signals; some I/O pads become inaccessible due to the fact I want a GND via in the I/O pins nominal via location.

Check out the pin assignment BGA diagrams on p53, p64, p65

http://www.ovro.caltech.edu/~dwh/carma_board/engineering_specification.pdf (http://www.ovro.caltech.edu/%7edwh/carma_board/engineering_specification.pdf)

The PCB files and a link to a viewer can be found here;

http://www.ovro.caltech.edu/~dwh/carma_board/index.html (http://www.ovro.caltech.edu/%7edwh/carma_board/index.html)

if you wanted to look at the PCB layout.

The bottom of the BGAs on the boards are pretty cool as 0402 capacitors and resistors are pretty darn small!

I did not use the Device Migration manager to implement this. Do you think it would have been able to incorporate all of these design decisions? Perhaps I'll look at it for the Stratix IV GX project I am working on.

Cheers,

Dave