SCAM on LDV (round 2)

Lohmeyer, John JLOHMEYE at
Thu Oct 24 11:51:00 PDT 1996

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

George wrote:
>What, no comments on SCAM being usable on LDV!!!  Did everyone leave the
>country or what.  Could it be that there just is no interest in SCAM on   
>Many think LVD is the furture of SCSI which implies there is no SCAM in
>the future. It seems to me the only logical thing to do would be to
>elimiate SCAM altogether or to removed it from SPI and make it in to
>a tecnical report.

Not so fast, George.  SCAM should work perfectly fine on LVD.  There is   
no reason the LVD drivers cannot be operated in wired-OR mode (they   
already are required to operate in wired-OR mode on the RST, BSY, and SEL   
signals).  SCAM operates several more signals in wired-OR mode and it   
needs to be able to both drive and receive these signals at the same   
time.  Otherwise, SCAM demands nothing of the drivers and receivers that   
normal SCSI does not demand.

SCAM should also work fine on HVD, but I do not know of any   
implementations because SCAM support for HVD requires way too many pins   
on the protocol chip to support the external transceivers.  LVD solves   
this problem by putting the drivers and receivers on the protocol chip.

>This topic should be placed on the agenda for Palm Springs.

I'll add it if you want, but I think there is very little to discuss.


PS: All of the announced and shipping LVD silicon in the worId already   
supports SCAM.

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

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