Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Cyclone 5 custom board PLL issues

I created a board for cyclone 5 soc 5CSEBA5U19. The design behaves in a strange way. (hardware design) The JTAG chain has the HPS then the FPGA in series, like in DE1-SOC eval board. The FP...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

"don't work" means the lock signal is not raised and no output clock from the PLL. I use the oscilloscope to see the signals.

If no sufficient filtering exists, will the PLL stop working at all ??? I think the board has ferrite beads as filters.