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Appendix A. Library Specifications
121
• We recommend using active SCSI terminators on fast single-ended SCSI busses. The
active terminator helps maintain a high degree of signal integrity and improves
noise immunity.
• A minus sign (-) next to the signal indicates an active low signal.
• All passive terminators use a 220Ω pull-up resistor and 330Ω pull-down resistor for
each signal. Resistor tolerances in the terminator network are ±5%, or less. Use
resistors with ±1% tolerance for improved noise margins.
25 SR/+RST 59 -RST/-RST
26 SR/+MSG 60 -MSG/-MSG
27 SR/+SEL 61 -SEL/-SEL
28 SR/+C/D 62 -C/D/-C/D
29 SR/+REQ 63 -REQ/-REQ
30 SR/+I/O 64 -I/O/-I/O
31 SR/+DB8 65 -DB8/-DB8
32 SR/+DB9 66 -DB9/-DB9
33 SR/+DB10 67 -DB10/-DB10
34 SR/+DB11 68 -DB11/-DB11
Pin Signal Pin Signal