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Altera_Forum
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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

After more investigation, I found that some PLLs in one FPGA are working. Others don't. The FPGA in the other board has some PLLs that work and other that don't work. PLLs are not the same in the two boards.

Is this an issue with the supply? Is this an issue in the FPGA chips?