Experimental Physics and
Industrial Control System

	It is absolutely possibly to run multiple VxWorks systems
in a VME crate. VMEbus is designed as a multi-master bus.
One of the issues that crops up is that each interrupt level
can only be "steered" to one of the masters. I.e. if you have
two I/O modules which require interrupt service, and you'd like
each VxWorks system to service one of the I/O modules, then
each module will have to use a different VMEbus interrupt level,
and each VxWorks system should only enable "sensitivity" to one
of the two interrupt levels.

	There are also considerations of bus arbitration for 
Basic read/write access. In my experience the most profound 
Implication of this is that you need to include the bus grant
"daisy chain" jumpers on non-self-configuring backplanes.

HTH -- Larry


> -----Original Message-----
> From: W T Meyer [mailto:[email protected]] 
> Sent: Tuesday, November 09, 2004 7:03 PM
> To: [email protected]
> Subject: Multiple IOC's in a crate?
> 
> 
> Is it possible to run two or more IOCs in a single VME crate? 
> At present 
> we're running MVV-177 IOCs running VxWorks, but are 
> considering upgrading.
> 
> Tom Meyer
> 

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