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Dave: thanks again for your help.
I'm actually using the BGA package, which does not have such PAD.
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Ok.
Can you probe each of the vias to the BGA balls? If you board has been designed well, then the bottom of each via will have had the solder mask removed so that you can stick a scope probe tip in each via.
Probe each of the supply voltages and confirm they are at the correct level.
Probe each of the JTAG pins and confirm they toggle when the JTAG tool is used to access them (Quartus has a JTAG debugger tool).
Check that the chip-enable input (nCE) is low, and check that the MSEL pins are asserted to an appropriate level.
The JTAG interface should work if the power is applied and the device JTAG chain is connected ok.
Cheers,
Dave
Honored Contributor
