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Altera_Forum
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9 years ago

Cyclone 4 ALTPLL wrong freq output

I used EP4CE55F23I7 in a custom board. The problem is that the output of the ALTPLL is wrong. Input clk freq is 50Mhz. ALTPLL output clk freq is around 100KHz although I configured it to an output...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

The two boards behave strangely.

As I said before, two input clocks have this issue. But in one board, two output clocks from the two ALTPLL (driven by two independent clocks) are in KHz. In the second board, only one output is in KHz and the other output is not generated at all. So I think this may be related to pins soldering?

I still have few boards that are not soldered, only the FPGA is soldered and I may try to solder the other necessary components and try one last board before taking any decision.

The package is BGA so I cannot check if the pins are correctly soldered or not.

Thanks