Bitfields for Intel 82437VX,82439TX SDRAM control register:
Bit(s)	Description	)
 15-9	reserved
 8-6	Special SDRAM Mode Select
	000 normal mode (default)
	001 enable NOP command
	010 enable All Banks Precharge command
	011 enable Mode Register Command
	100 enable CBR Cycle
	101 reserved
	11x reserved
 5	(82437VX) reserved
 5	(82439TX) RAS# to CAS# Override
	=1 and CAS# latency=0, RAS# to CAS# is delayed 2 HCLKs
	=0 RAS# to CAS# delay determined solely by CAS# latency setting
 4	CAS# latency
	=1 latency is 2 for all SDRAM cycles
	=0 latency is 3
 3	RAS# precharge and refresh timing
	=0 slower
	=1 faster
 2	reserved
 1	(82437VX) reserved
 1	(82439TX) 64-Mbit Technology Enable
	=1 supports 64M-bit SDRAM devices
	=0 supports 64M-bit EDO/FPM devices only
 0	reserved
SeeAlso: #01099,#01108,#01112