Bitfields for OpenHCI "HcFmInterval" register:
Bit(s)	Description	)
 31	"FIT"	toggled each time a new value is loaded into bits 13-0
 30-16	"FSMPS"	largest data packet in bits
 15-14	reserved
 13-0	"FI"	Frame Interval (between to consecutive SOFs)
SeeAlso: #00902,#00914