Hello,
Unfortunately, the Phase-locked loop (PLL) is not available for the S32K11x product series. That is why you cannot select it.
Please, refer to the Reference Manual rev 12.1 "Figure 27-1. Clocking diagram" note number 3.
" 3. For S32K11x, inputs and muxes connected to PCC are Reserved. Also SPLLDIVx_CLK are Reserved as indicated in RED "
Best regards,
Diana