Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/AT91SAM9G10/PMC/CKGR_PLLBR#0x0
PLL B Register
Divider B
PLL B Counter
PLLB Clock Frequency Range
PLL Multiplier
Divider for USB Clock
https://github.com/cmsis-svd/cmsis-svd-data