Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Keil/AT32F437xx_v2/USB_OTG1_HOST/HCFG#0x0
OTGFS host configuration register (OTGFS_HCFG)
FS/LS PHY clock select
FS- and LS-only support
https://github.com/cmsis-svd/cmsis-svd-data