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Appendix A. Library Specifications
123
• On the differential SCSI bus, signal information is sent through a wire pair. The
voltage difference between the pair of signal wires determines the state of the
signal.
• A true DIFFSENS signal (active high) enables the differential drivers. If a single-
ended device or terminator is inadvertently connected, this signal is grounded,
disabling the differential drivers. Single-ended and differential SCSI devices cannot
coexist on the same bus.
• All wire pairs must be terminated. Resistor tolerances in the terminator network are
±5 percent, or less.
• The signal pair is terminated with a 150Ω resistor between the pairs, a 330Ω pull-up
resistor to terminator power and a 330Ω pull-down resistor to ground.
25 +MSG 59 -MSG
26 +SEL 60 -SEL
27 +C/D 61 -C/D
28 +REQ 62 -REQ
29 +I/O 63 -I/O
30 GND 64 GND
31 +DB(8) 65 -DB(8)
32 +DB(9) 66 -DB(9)
33 +DB(10) 67 -DB(10)
34 +DB(11) 68 -DB(11)
Pin Signal Pin Signal