When using the PLL_ADC_internal followed by a ClockControlBlock which goes to the internal Dual-ADC from the Max10, it is not possible to connect it as shown below.
If so, Quartus can't fit it. Now, when this ClockControlBlock is deleted it works. The reason for this Clock-ControlBlock is to disable the PLL_ADC when not used.
- How would you enable/disable such ADC PLL Clock?
Put the PLL in reset. Given you don't appear to use the clock out of the PLL for anything else I can't see this being a problem.
Gating a clock to an internal block (internal ADC) may well be something the MAX10 routing cannot accommodate. If this was to an external pin I wouldn't anticipate a problem.
The disadavantage of a reset is, that it takes much longer until the PLL is working again. Therefore I would like to use a ClockControl. Is this configuration simply not possible??
If Quartus says 'no' then I suspect it's not possible, although I am a little surprised. I may well try this later...
If you can feed the clock off the device and back in on another pin I'm suspect you'll be able to realise a solution.