Duplicating of Modules

[Arsh G]

Hi,

I'm trying to instantiate multiple instances of the same module in chisel for example

val X1   = Module(new Y(proto= ...))
val X2   = Module(new Y(proto= ...))
val X3   = Module(new Y(proto= ...))
val X4   = Module(new Y(proto= ...))
...
upto n times
I've tried mapping them to List, so
val X   = Module(new Y(proto= ...))
val Y  = (0 until n).map(x => X).toList

The chisel compiles but when I do hardware simulation I can only see one module not multiple ones in this method.

Can someone point out why this is happening, I've tried googling but of no help ? :(

Thank you

[Edward Wang]

Hi,

Thanks for your interest in Chisel. One thing to take a look at could be https://www.chisel-lang.org/docs/cookbooks/hierarchy#how-do-i-instantiate-multiple-instances-with-the-same-module-parameterization

Additionally, are all the modules used? FIRRTL/CIRCT I believe will remove unused hardware elements so that might be another possibility.

[Kevin Laeufer]

Something that might also be worth trying is:

val Y = (0 until n).map(_ => Module(new Y(proto= ...))).toList

The difference here is that this now calls the constructor n times.
The previous version was just copying the _reference_ to the module n
times. I.e., you got n references to the same module instance.

- Kevin

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