Bitfields for AMD-640 Non-Cacheable Control Register:
Bit(s)	Description	)
 7	segment C000h-C7FFh cacheable and write-protected
 6	D000h-DFFFh cacheable and write-protected
 5	E000h-EFFFh cacheable and write-protected
 4	F000h-FFFFh cacheable and write-protected
 3	reserved (0)
 2	force L2 cache fill
 1	reserved (1)
 0	L2 write mode (0 = writeback, 1 = write-through)
SeeAlso: #00983,#00985,#00987