Forum Discussion
Altera_Forum
Honored Contributor
Honored ContributorCyclone III PLL loses lock at >75C
I am using PLL reconfiguration. When the FPGA is powered up the PLL is loaded with different M, N and C values for the frequency I want to generate. The PLL will lock below 75C but once it gets t...
Altera_ForumHonored Contributor
Honored ContributorI know this thread is pretty old, but I am having the same problem.
I have a Cyclone III EP3C25F256I7 and when I reconfigure the PLL's M,N,C values to a certain value at high temperatures (65C), the PLL loses lock and doesn't recover. I have about 10 sets of M,N,C values I program the PLL too. Only 1 set of them will cause the PLL to lose lock and not recover. This only happens on 2/6 FPGAs I tested. There is no issue at room temperature and if I hit it with cold spray, it will recover lock as well. Any body experience something similar?
