Bitfields for AMD-640 Cache Control Register 2:
Bit(s)	Description	)
 7-6	reserved (0)
 5	backoff processor until L2 cache filled
 4	reserved (0)
 3	two banks of SRAM instead of one
 2	reserved (0)
 1-0	L2 cache size
	00 = 256K
	01 = 512K
	10 = 1M
	11 = 2M
SeeAlso: #00983,#00984,#00986