FindRoute

[amit1947]

Does FindRoute require routes to be pre-defined in the switch executive before it can find a route that can connect 2 channels? In other words, does FindRoute just search the list of pre-defined routes to find the best one that connects 2 channels?

Or does is it able to dynamically "create" a route at runtime (without pre-defined routes)?

[crossrulz]

I do not create routes in my Switch Executive setup.  What I do is connect colum X to row Z and then connect colum Y to row Z.  But I like to make sure I know which row is being used.  You do not have to do that.  You could just state connect colum X to colum Y and it will find a way.

[amit1947]

Thanks for the reply.

Now I understand that FindRoute can dynamically find a path between two channels.

How do I restrict the use of a shared bus so that sharing a bus line is not allowed? For example, if I have several 16x8 matrix cards connected together, where all rows of 8 are shared as a bus, I want to make sure that when making connections between columns of different matrix cards, I do not use the same shared bus "row" (I am not referring to channel exclusion).

When I use "FindRoute" the path it always finds uses "r0". But if I want to make two different connections concurrenlty, both paths would use the same row!

[crossrulz]

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amit1947 wrote:

When I use "FindRoute" the path it always finds uses "r0". But if I want to make two different connections concurrenlty, both paths would use the same row!

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Another reason I explicitly state which row to connect to.  Whithout exclusions, Switch Executive will assume it can reuse rows.

[amit1947]

Ok, I get it, you have to make the connections explicity to specify what "shared" rows to use.

I think this is an oversight on the part of NI. I would think that an executive would be able to optionally manage a shared bus so that paths are can not be shorted together.

[crossrulz]

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amit1947 wrote:

I think this is an oversight on the part of NI. I would think that an executive would be able to optionally manage a shared bus so that paths are can not be shorted together.

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It can.  You just have to put in all of the exclusions in the executive.  I find it easier to just state which rows to use.

[amit1947]

I am only aware of channel exclusion rules. Are there rules that can protect shared rows?