Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/ATSAM3A8C/UOTGHS/HSTDMANXTDSC6#0x0
Host DMA Channel Next Descriptor Address Register (n = 6)
Next Descriptor Address
https://github.com/cmsis-svd/cmsis-svd-data