Bitfields for Intel 82437VX,82439TX Arbitration Control register:
Bit(s)	Description	)
 7	extended CPU-to-PIIX PHLDA# signalling enabled
 6-0	(82439TX) reserved
 6-4	reserved
 3	(82437VX) CPU priority enable
	=1 CPU gets PCI bus after two PCI slots
	=0 CPU gets PCI bus after three PCI slots
 2-0	reserved
SeeAlso: #01099,#01108,#01110