Spectra Logic 10000 User Manual
Page 123
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 150
Ω resistor between the pairs, a 330Ω pull-up
resistor to terminator power and a 330
Ω 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