20 Jan
2001
20 Jan
'01
7:09 p.m.
does this mean that
differential SCSI doesn't have any ground pins, instead using these for
the complement?
There are some ground lines, but not nearly as many as in single-ended
SCSI. "Narrow" SCSI has 9 data lines (8+parity) and 9 control lines, so
there are 18 differential pairs.
Another interesting feature of HVD (high voltage differential) SCSI is
that there are no "active terminators". The terminations are just single
resistors (110 ohm? I forget.) between the signals of a pair. No
termination voltage source needed.