Bitfields for Intel 82441FX DRAM Control register:
Bit(s)	Description	)
 7	reserved
 6	enable DRAM Refresh Queue
 5	enable DRAM EDO Auto-Detect Mode
 4	DRAM Refresh Type
	=0 CAS before RAS
	=1 RAS only
 3	reserved
 2-0	DRAM refresh rate
	000 disabled
	001 normal (as set by PMCCFG register)
	01x reserved
	1xx reserved
	111 fast refresh (every 32 host clocks)
SeeAlso: #01229,#01233,#01235