differential scsi termination
asami at dt.wdc.com
Mon Feb 5 19:05:02 PST 1996
* From the SCSI Reflector, posted by:
* Tak Asami <asami at dt.wdc.com>
> * From the SCSI Reflector, posted by:
> * "James Leahy" <jleahy at pyramid.com>
> I've been told that the termination for differential ultra-scsi is
> being reduced to 90 ohms from 120 ohms. Could someone from the X3t10
> committee comment on this?
Not to my knowledge. Fast-20 is about to becomd a standard, and the
latest draft revision, as far as I know, is 6, and it has been stable
for several month.
This document still specifies Termpwr-330ohm-150ohm-330ohm-gnd for
differential impedance of about 120ohm. This is identical to what is
on SPI (which is already a standard).
Could that "rumor" come from spi-2 low voltage differential work?
LVD tereminator's differential impedance is somewhere around 90ohm.
_|_|_| asami at dt.wdc.com
_|/ _| WESTERN DIGITAL (714) 932-7621 : Voice
_|_|_| (714) 932-6496 : Fax
More information about the T10