Bitfields for AMD-640 DRAM Control Register 2:
Bit(s)	Description	)
 7	enable EDO test mode
	when set, EDO RAM contents will read correctly, FPM not
 6	reserved (0)
 5-3	(AMD-640) reserved (0)
 5	(VT82C580VPX) SDRAM CAS# latency (0 = latency 2, 1 = latency 3)
 4	(VT82C580VPX) reserved (0)
 3	(VT82C580VPX) enable Turbo EDO mode (0 = x-2-2-2, 1 = x-1-1-1 bursts)
 2	add one wait state for memory data-to-host data pop
 1	reduce RAS# precharge by 1T for SDRAM
 0	reduce RAS# to CAS# delay for SDRAM
Note:	bits 1 and 0 have no effect unless SDRAM has been selected via the
	  DRAM type register (see #00991)
SeeAlso: #00983,#00996,#00982