Bitfields for Intel 82439HX Error Command register:
Bit(s)	Description	)
 7	SERR# duration
	=0 one PCI clock
	=1 until error flags are cleared
 6-3	reserved
 2	force bad parity on multiple-bit uncorrectable error
 1	assert SERR# on multiple-bit uncorrectable error
 0	assert SERR# on single-bit correctable error
SeeAlso: #01098,#01127