Motorola MVME712AM, MVME712A/D3, MVME712-12, MVME712B user manual GND Ground Termpwr Terminator Power

3

Support Information

Table 3-7. SCSI INTERFACE Interconnect Signals (MVME712B) (Continued)

Pin	Signal	Signal Name and Description
Number	Mnemonic
33	DB07*	DATA bus (bit 7) - most signiÞcant bit and the
		highest priority during the arbitration phase.
34	DBP*	DATA bus (parity) - data parity is odd. Use of
		parity is a system option. Parity is not valid
		during the arbitration phase.
35-37	GND	GROUND
38	TERMPWR	TERMINATOR POWER
39,40	GND	GROUND
41	ATN*	ATTENTION - signal driven by the initiator.
		Indicates the attention condition.
42	GND	GROUND
43	BSY*	BUS BUSY - OR-tied signal that indicates that
		the bus is being used.
44	ACK*	ACKNOWLEDGE - signal driven by an initiator
		to indicate an acknowledgment for a REQ/ACK
		data transfer handshake.
45	RST*	RESET - OR-tied signal that indicates the RESET
		condition.
46	MSG*	MESSAGE - signal driven by the target during
		the message phase.
47	SEL*	SELECT - signal used by an initiator to select a
		target or by a target to reselect an initiator.
48	D/C*	DATA/COMMAND - signal driven by the
		target. It indicates whether command or data
		information is on the data bus. True (low)
		indicates command.
49	REQ*	REQUEST - signal driven by a target to indicate
		a request for a REQ/ACK data transfer
		handshake.
50	O/I*	OUTPUT/INPUT - signal driven by a target that
		controls the direction of data movement on the
		bus. True (low) indicates input to the initiator.
		False (high) indicates output from the initiator.
		This signal is also used to distinguish between
		selection and reselection phases.

3-12 MVME712-12/-13/A/AM/B Transition Modules and LCP2 Adapter Board UserÕs Manual