override def clone =

[Stephan]

Hi All,

Can anyone explain the need of the clone methode often seen in Bundle definitions and provide a minimalistic example that truely relies on that definition. Thanks in advance.

Regards,
Stephan

[Jonathan Bachrach]

cloning is the way that types are copied allowing even wires to provide their type as input to things like ValidIO:

class ValidIO[+T <: Data](gen: T) extends Bundle {

  val valid = Bool(OUTPUT)

  val bits = gen.clone.asOutput

  def fire(dummy: Int = 0): Bool = valid

  override def clone: this.type = new ValidIO(gen).asInstanceOf[this.type]

}

usage:

  new ValidIO(UInt(width = 8))

the main place where you need to provide a clone method is when a bundle class definition depends on its parameters for creation.  it's pretty easy to do if you just copy and paste the template from above.  the template includes the this.type return type and the coercion to this.type using asInstanceOf.

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[Martin Schoeberl]

Thanks for providing this small example. Would be good if this (and other tips) could be collected either in the tutorial or in getting started.

Cheers,
Martin

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[Stephan]

Thanks from my side also!

- Stephan