Ampro Corporation P5X manual Scsi Interface Configuration, Pin Signal Function

Little Board/P5x Technical Manual

Table 2– 31. SCSI Interface Connector (J9)

Pin	Signal			Function		Pin	Signal	Function
2		DB0*		Data Bit 0 (LSB)	4		DB1*	Data Bit 1
6		DB2*		Data Bit 2	8		DB3*	Data Bit 3
10		DB4*		Data Bit 4	12		DB5*	Data Bit 5
14		DB6*		Data Bit 6	16		DB7*	Data Bit 7
18		DBP*		Data Bit Parity	26		TERM	Termination +5V DC
							PWR
32		ATN*		Attention	34		GROUND	Signal Ground
36		BSY*		Busy	38		ACK*	Transfer
								Acknowledge
40		RST*		Reset	42		MSG*	Message
44		SEL*		Select	46		C/D*	Control/Data
48		REQ*		Transfer Request	50		I/O*	Data Direction
25		N/A		Key Pin
	1-49(odd), 20,22,24,28,30						Ground
				Table 2– 328. J9 Mating Connectors
		Connector Type				Mating Connector
				RIBBON		3M 3425-7600
						Latching Clip 3505-8050
			DISCRETE WIRE			MOLEX HOUSING 22-55-
						2502
						PIN 16-02-0103

SCSI Interface Configuration

Enable or disable the SCSI interface using Setup. Refer to the Setup description beginning on page 2–62.

Interrupt Request Assignment

The SCSI interface is a PCI peripheral and is assigned to a PCI interrupt using the plug-and-play logic in the BIOS. No user setup is required

Active Terminators

The SCSI interface uses “active terminators” for the SCSI bus. Active terminators draw less current than 330/220 ohm terminators (standard for non-UltraSCSI interfaces), are less susceptible to noise, and are required for the high data transfer rates of UltraSCSI. Termination is controlled by the SCSI BIOS. There is no user setting.

Only the SCSI devices on each end of the SCSI bus should be terminated.

2–37