Fujitsu M3097DG A.2.2 Bus signals

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A.2.2 Bus signals

			Initiator
Signal name		Type of signal
			Target
Data	DB0	Eight data-bit signals, plus a parity-bit signal that
	DB1	form a DATA BUS. DB(7) is the most significant
	DB2	bit and has the highest priority during the
	DB3	ARBITRATION phase. Bit number, significance,
	DB4	and priority decrease downward to DB(0).
	DB5
	DB6	A data bit is defined as one when the signal value is
	DB7
	(Data Bus n)	true. A data bit is defined as zero when the signal
		value is false. Data parity DB(P) shall be odd.
	DBP	Parity is undefined during the ARBITRATION
	(Data Bus	phase.
	Parity)
Control	BSY	An “ORtied” signal that indicates that the bus is
signals	(Busy)	being used
	SEL	An “ORtied” signal used either by an initiator to
	(Select)	select a target or by a target to reselect an initiator
	RST	An “ORtied” signal that indicates the RESET
	(Reset)	condition
	C/ D	The C/D, I/O, and MSG signals are used to
	(Control/Data)	distinguish between the different information
		transfer phases.
	I/ O
	(Input/Output)
	MSG
	REQ	During an information transfer phase, the target uses
	(Request)	this signal to request the initiator to transfer data
	ACK	A signal driven by an initiator to indicate an
	(Acknowledge	acknowledgement for REQ/ACK data transfer
		handshake
	)
	ATN	A signal driven by an initiator to indicate the
	(Attention)	ATTENTION condition

Appendix A-6