Fujitsu MB86617A manual Is set at ‘1’

LSI Specification				MB86617A
BIT	Bit Name	Action	Value	Function
			0	Indicates that port event and resume processing have notoccurred.
		Read
				Indicates that Connected, Bias, Disabled, Fault bit has changed when Int_enable bit
2	Port_event		1
				is set at ‘1’.
				Indicates that resume processing was performed when Resume_Int bit is set at‘1’.
		Write	-	Clears the bit value to ‘0’ by writing in ‘1’.
		Read/	0	Disables arbitration acceleration function.
1	Enab_accel
		Write	1	Enables arbitration acceleration function.
		Read/	0	Disables multi-speed packet concatenation function.
0	Enab_multi
		Write
			1	Enables multi-speed packet concatenation function.

Rev.1.0 89 Fujitsu VLSI