LVDS question

Tak Asami asami at
Tue Oct 10 09:10:17 PDT 1995

Ron Cudzewicz of fermi lab wrote:
> Just wondering if LVDS is going to use the same signaling levels, etc.

Yes, Ron.  LVDS is a lot different from conventional differential scsi.
LVDS is signal level compatible to industry standards such as IEEE-1596.3,
EIA-422, 485 or 612.  Diff scsi is EIA 485 compatible.
To make the long story short, its main motivations are to:

1) Take advantage of signal integrity of differential scsi to enable 
   faster data tranfer rate (Fast-40 and Fast-80).
2) Reduce the driving power on the signal so the drivers can be built
   in to the LSI device for lower cost.

LVDS is being documented in the new SPI-2 project in ANSI X3T10 and it
is expected to have ability to automatically detect the signal levels,
(it uses the same cable pin-outs as its predecessor), but they cannot
talk the different levels (single ended, differential, LVDS) on the bus.

Yes, it does have the potential of obsoleting the existing differential scsi.
                           Tak Asami
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