Bitfields for Intel 82434LX/NX DRAM Control:
Bit(s)	Description	)
 7-6	(NX only) DRAM burst timing
	00  X-4-4-4 read/write (default)
	01  X-4-4-4 read, X-3-3-3 write
	10  reserved
	11  X-3-3-3 read/write
 5	parity error mask
 4	0-Active RAS# mode
 3	SMRAM enable (must be set to enable reg 72h)
 2	Burst-of-Four Refresh
 1	Refresh Type
	=0 RAS#-only
	=1 CAS#-before-RAS#
 0	DRAM Refresh Enable
SeeAlso: #01055