Bitfields for AMD-640 DRAM Configuration Register 1:
Bit(s)	Description	)
 7-5	type of address mapping for memory banks 0 and 1
	---EDO/FastPageMode---
	000 eight-bit column address
	001 nine-bit column address
	010 ten-bit column address
	011 eleven-bit column address
	100 twelve-bit column address
	other reserved
	---SDRAM---
	0xx = 16-Mbit SDRAM (see #00991)
	1xx = 64-Mbit SDRAM
 4	reserved (0)
 3-1	type of address mapping ofr memory banks 2 and 3
 0	reserved (0)
SeeAlso: #00983,#00990