Object

chisel3

dontTouch

Related Doc: package chisel3

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object dontTouch

Marks that a signal should not be removed by Chisel and Firrtl optimization passes

Example: 

  1. class MyModule extends Module {
  val io = IO(new Bundle {
    val a = Input(UInt(32.W))
    val b = Output(UInt(32.W))
  })
  io.b := io.a
  val dead = io.a +% 1.U // normally dead would be pruned by DCE
  dontTouch(dead) // Marking it as such will preserve it
}
Note

Calling this on Data creates an annotation that Chisel emits to a separate annotations file. This file must be passed to FIRRTL independently of the .fir file. The execute methods in chisel3.Driver will pass the annotations to FIRRTL automatically.

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  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. def apply[T <: Data](data: T)(implicit compileOptions: CompileOptions): T

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    Marks a signal to be preserved in Chisel and Firrtl

    Marks a signal to be preserved in Chisel and Firrtl

    data

    The signal to be marked

    returns

    Unmodified signal data

    Note

    Requires the argument to be bound to hardware

  5. final def asInstanceOf[T0]: T0

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  6. def clone(): AnyRef

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  7. final def eq(arg0: AnyRef): Boolean

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  8. def equals(arg0: Any): Boolean

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  9. def finalize(): Unit

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    @throws( classOf[java.lang.Throwable] )

  10. final def getClass(): Class[_]

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  11. def hashCode(): Int

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  12. final def isInstanceOf[T0]: Boolean

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  13. final def ne(arg0: AnyRef): Boolean

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  14. final def notify(): Unit

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  15. final def notifyAll(): Unit

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  16. final def synchronized[T0](arg0: ⇒ T0): T0

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  17. def toString(): String

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  18. final def wait(): Unit

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  19. final def wait(arg0: Long, arg1: Int): Unit

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  20. final def wait(arg0: Long): Unit

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