Bitfields for Intel 82371SB slave IDE timing register:
Bit(s)	Description	)
 7-6	secondary drive 1 IORDY# sample point
	00 five clocks after DIOx# assertion
	01 four clocks
	10 three clocks
	11 two clocks
 5-4	secondary drive 1 recovery time
	00 four clocks
	01 three clocks
	10 two clocks
	11 one clock
 3-2	primary drive 1 IORDY# sample point
 1-0	primary drive 1 recovery time
SeeAlso: #01223