SCAM on LDV (round 2)

Lohmeyer, John JLOHMEYE at
Fri Oct 25 20:33:00 PDT 1996

* From the SCSI Reflector (scsi at, posted by:

Skip and George,

I'll put LVD SCAM on the SPI-2 meeting agenda for Monday Morning.  I   
meant to put the agenda out today but got interrupted by events at work.   
 It should go out Monday.

And yes, it is not immediately obvious that SCAM works with LVD.  I think   
there is a perception that SCAM cannot work with differential because   
there are no HVD SCAM implementations.  This was because the pin count is   
just too expensive with external transceivers -- not a fundamental   
problem with differential.

My response to George was delayed while I got confirmation that we   
actually supported SCAM in our part.  For me, the most non-obvious   
question is what happens when all those current-mode LVD drivers are all   
asserting at the same time.  It seems like the receivers will see a large   
voltage -- they do, but it is not a problem.


PS: George: Sorry if I sounded arrogant.  Skip: Are we really 6 months   
ahead of you guys?  ;-)

John Lohmeyer                 E-Mail: john.lohmeyer at
Symbios Logic Inc.             Voice: 719-533-7560
4420 ArrowsWest Dr.              Fax: 719-533-7036
Colo Spgs, CO 80907-3444    SCSI BBS: 719-533-7950 300--14400 baud

* For SCSI Reflector information, send a message with
* 'info scsi' (no quotes) in the message body to majordomo at

More information about the T10 mailing list