Bitfields for PCI Configuration Bridge Control Register:
Bit(s)	Description	)
 7	enable fast back-to-back cycles on secondary bus
 6	reset secondary bus
 5	master abort mode on secondary bus
 4	reserved
 3	VGA enable (when set, forward VGA memory and I/O ranges to seconary
	  bus)
 2	ISA enable
 1	reserved
 0	enable parity error response
SeeAlso: #00878,#01131