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MPC5777C EBI constraints

Question asked by Etienne Alepins on Jul 12, 2018
Latest reply on Jul 13, 2018 by Etienne Alepins

Hi,

 

We are in the process of allocating the CPU pins of our board. We want to use the following EBI CS:

 

CS0: 32bits muxed

CS1: 16bits non-muxed

CS2: 16bits non-muxed

CS3: 32bits muxed

 

We also want to use TEA signal.

 

1) We don't see how CS2 can used used in muxed mode since the same pin is used both for CS2, Addr31 and Data31...

2) Can we used both CS3 and TEA? It seems not since they are on the same pin.

3) Would it be possible to use CS0 and CS1 to drive 4 chips selects through an external decoder?

 

We do not understand why there are such constraints limitating the use of EBI module...

 

Thanks!

Étienne

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