| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 82.1 | resolution to #2 question in .0 | ZYDECO::BODA | Realtime Products Support | Wed Mar 31 1993 03:58 | 12 |
| The problem in .0's question #2 has been resolved.
Once the customer put both the KAV's next to each other (as was recommended
to them by a colleague of mine earlier) they no longer experience the
arbiter, slave, or master errors. The arbiter error apparently can simply
mean that there was an arbitration problem on the bus - not that it necessarily
was the arbiter. I could even indicate that there was no arbiter. Given that
we did not know how their intervening VMEbus devices were configured, it's
possible that the arbitration was not taking place correctly.
Rule of thumb therefore is, for KAV30's doing master/slave access to one another,
place them next to eachother on the bus.
|
| 82.2 | You can have open slots, assuming you've configured your VME bus/backplane correctly | STAR::NORDH | OpenVMS Development, DTN 381-1672 | Fri Apr 30 1993 20:32 | 21 |
| Re. .1
>>>Rule of thumb therefore is, for KAV30's doing master/slave access to one another,
>>>place them next to eachother on the bus.
This is not really true! You problem which you had was that the VME slots between
the two KAV30's did not have the arbitrator control lines wired for each open slot
at the back of the backplane.
So, to correct your rule of thumb, is that it must be VME boards(any) between two
masters or have the arbiter lines wired for each slot where no VME modules is inserted, to
pass along the arbiter control lines to the arbiter(slot 1). The arbiter is always the
slot 1 module. I believe I remember that there exist VME "grant" cards, so you do not need
to insert jumpers for each open slot.
All this is documented in the KAV30 documentation set(as far as I remember) under
configuration rules section.
Hope this helps,
-Jan
|
| 82.3 | I stand corrected . . . | ZYDECO::BODA | Realtime Products Support | Sat May 01 1993 03:40 | 14 |
| Hi Jan,
Thanks for that clarification. Unfortunately, I must have missed that in the
installation/configuration portion of the KAV30 H/W and Installation Guide.
The only section on configuring the VMEbus Backplane I saw was on p2-2 which
then refers you to the VMEbus crate and backplane documentation for info
on configuring the VMEbus backplane. I admit I did not have the doc readily
available.
82.2 has just become part of my docset.
Thanks again,
Alan
|