Bitfields for Intel 82425EX PCI control register:
Bit(s)	Description	)
 0	CPU-to-PCI byte merging
 1	CPU-to-PCI bursting enable
 2	PCI posted-write buffer enable
 4-3	subtractive decode sampling point
	00 slow
	01 typical
	10 fast
	11 reserved
 5	DRAM parity error enable
 6	target abort error enable
 7	reserved
SeeAlso: #01083,#01085,#01086,#01087