Bitfields for 82443BX DRAM Control:
Bit(s)	Description	)
 7-6	reserved
 5	module mode configuration (read-only)
	=0 self-refresh entry is staggered; if "SDRAMPWR" (offset 76h bit 4) is
	  set, 3 DIMMs are supported, CKE[5:0] is driven, and dynamic SDRAM
	  power-down is available; if "SDRAMPWR" is clear, 4 DIMMs are
	  supported but power-down is not available
	=1 self-refresh entry is not staggered; 3 DIMMs are supported, only
	  CKE0 is driven, and dynamic power-down is not available
 4:3	DRAM type
	00 EDO
	01 SDRAM
	10 registered SDRAM
	11 reserved
 2:0	DRAM refresh rate
	000 disabled
	001 15.6 microseconds
	010 31.2 microseconds
	011 62.4
	100 124.8
	101 249.6
	else reserved
SeeAlso: #01142