Bitfields for AMD-645 IDE Address Setup Time register:
Bit(s)	Description	)
 7-6	primary drive 0 address setup time
	00 = 1T
	01 = 2T
	10 = 3T
	11 = 4T
 5-4	primary drive 1 address setup time (same values as above)
 3-2	secondary drive 0 address setup time
 1-0	secondary drive 1 address setup time
SeeAlso: #01034,#01041