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Altera_Forum
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13 years ago

Help, search footprint for PLD ACEX EP1K100FC484-1

Hi, On a PCBA we have a PLD ACEX EP1K100FC484-1 . The footprint on the gerber file of the board show a depopulated "cross area ball" see attached file "PCBA footprint.jpg". But on the datas...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

The footprint could be the same than the one on the datasheet. From your Gerber viewer, measure the distance between two pads and compare with the value from the datasheet. It only looks like you have an unpopulated cross in the middle of your footprint because all the tracks that go from the BGA pads to the vias go away from the centre. If you pay attention you will see that the FPGA pads are regularly spaced and there is no missing row or column in the middle.