Bitfields for Intel 82371FB/83271SB programmable chip select control register:
Bit(s)	Description	)
 15-2	I/O address which will assert PCS# signal
 1-0	PCS address mask
	00 four bytes
	01 eight contiguous bytes
	10 disabled
	11 sixteen contiguous bytes
SeeAlso: #01167,#01219,#01221