AHA 29160 and Twintailed SCSI?
sysv at wildape.com
Mon Jul 24 03:30:00 MDT 2000
Kris Land wrote:
> Hello, and good morning.
> The 29160 card is a 160MSCSI spec card running at 80Mhz across a 16 bit
> data bus in differential mode or LVD "Low Voltage Differential". U2W or
> ultra two wide SCSI is loosely referred to as LVD. The first LVD to be
> released under the SCSI spec was LVD so the name caught on but LVD/U2W runs
> at a clock rate of 40Mhz not 80MHZ which is the spec for 160M even thought
> 160M does use LVD for its transmission lines.
> LVD is + and - differential pairs unlike SE "Single Ended" which uses
> ground as the signel reference point. The problem with twintailed is going
> to be high frequency reflections the SCSI spec does not allow for "T"'s or
> splits on the SCSI chain. So even though this may???? work, there may a
> sever performance hit as well as data loss.
The card also supports `all' other kind of SCSI, wich one would be
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