Packages

  • package root

    This is the documentation for Chisel.

    This is the documentation for Chisel.

    Package structure

    The chisel3 package presents the public API of Chisel. It contains the concrete core types UInt, SInt, Bool, FixedPoint, Clock, and Reg, the abstract types Bits, Aggregate, and Data, and the aggregate types Bundle and Vec.

    The Chisel package is a compatibility layer that attempts to provide chisel2 compatibility in chisel3.

    Utility objects and methods are found in the util package.

    The testers package defines the basic interface for chisel testers.

    Definition Classes
    root
  • package chisel3

    This package contains the main chisel3 API.

    This package contains the main chisel3 API.

    Definition Classes
    root
  • package util

    The util package provides extensions to core chisel for common hardware components and utility functions

    The util package provides extensions to core chisel for common hardware components and utility functions

    Definition Classes
    chisel3
  • class Pipe[T <: Data] extends Module

    Pipeline module generator parameterized by data type and latency.

    Pipeline module generator parameterized by data type and latency.

    This defines a module with one input, enq, and one output, deq. The input and output are Valid interfaces that wrap some Chisel type, e.g., a UInt or a Bundle. This generator will then chain together a number of pipeline stages that all advance when the input Valid enq fires. The output deq Valid will fire only when valid data has made it all the way through the pipeline.

    As an example, to construct a 4-stage pipe of 8-bit UInts and connect it to a producer and consumer, you can use the following:

    val foo = Module(new Pipe(UInt(8.W)), 4)
    pipe.io.enq := producer.io
    consumer.io := pipe.io.deq

    If you already have the Valid input or the components of a Valid interface, it may be simpler to use the Pipe factory companion object. This, which Pipe internally utilizes, will automatically connect the input for you.

    Definition Classes
    util
    See also

    Pipe factory for an alternative API

    Valid interface

    Queue and the Queue factory for actual queues

    The ShiftRegister factory to generate a pipe without a Valid interface

  • PipeIO

class PipeIO extends Bundle

Interface for Pipes composed of a Valid input and Valid output

Source
Valid.scala
Linear Supertypes
Bundle, Record, Aggregate, Data, SourceInfoDoc, NamedComponent, HasId, internal.InstanceId, AnyRef, Any
Ordering
  1. Grouped
  2. Alphabetic
  3. By Inheritance
Inherited
  1. PipeIO
  2. Bundle
  3. Record
  4. Aggregate
  5. Data
  6. SourceInfoDoc
  7. NamedComponent
  8. HasId
  9. InstanceId
  10. AnyRef
  11. Any
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. All

Instance Constructors

  1. new PipeIO()

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def :=(that: ⇒ Data)(implicit sourceInfo: SourceInfo, connectionCompileOptions: CompileOptions): Unit

    Connect this data to that data mono-directionally and element-wise.

    Connect this data to that data mono-directionally and element-wise.

    This uses the MonoConnect algorithm.

    that

    the data to connect to

    Definition Classes
    Data
  4. final def <>(that: ⇒ Data)(implicit sourceInfo: SourceInfo, connectionCompileOptions: CompileOptions): Unit

    Connect this data to that data bi-directionally and element-wise.

    Connect this data to that data bi-directionally and element-wise.

    This uses the BiConnect algorithm.

    that

    the data to connect to

    Definition Classes
    Data
  5. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  6. def _cloneTypeImpl: Bundle

    Implementation of cloneType using runtime reflection.

    Implementation of cloneType using runtime reflection. This should _never_ be overridden or called in user-code

    Attributes
    protected
    Definition Classes
    Bundle
    Note

    This is overridden by the compiler plugin (this implementation is never called)

  7. def _elementsImpl: Iterable[(String, Any)]
    Attributes
    protected
    Definition Classes
    Bundle
  8. def _usingPlugin: Boolean

    Indicates if a concrete Bundle class was compiled using the compiler plugin

    Indicates if a concrete Bundle class was compiled using the compiler plugin

    Used for optimizing Chisel's performance and testing Chisel itself

    Attributes
    protected
    Definition Classes
    Bundle
    Note

    This should not be used in user code!

  9. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  10. macro def asTypeOf[T <: Data](that: T): T

    Does a reinterpret cast of the bits in this node into the format that provides.

    Does a reinterpret cast of the bits in this node into the format that provides. Returns a new Wire of that type. Does not modify existing nodes.

    x.asTypeOf(that) performs the inverse operation of x := that.toBits.

    Definition Classes
    Data
    Note

    bit widths are NOT checked, may pad or drop bits from input

    ,

    that should have known widths

  11. final macro def asUInt: UInt

    Reinterpret cast to UInt.

    Reinterpret cast to UInt.

    Definition Classes
    Data
    Note

    value not guaranteed to be preserved: for example, a SInt of width 3 and value -1 (0b111) would become an UInt with value 7

    ,

    Aggregates are recursively packed with the first element appearing in the least-significant bits of the result.

  12. def autoSeed(name: String): PipeIO.this.type

    Takes the last seed suggested.

    Takes the last seed suggested. Multiple calls to this function will take the last given seed, unless this HasId is a module port (see overridden method in Data.scala).

    If the final computed name conflicts with the final name of another signal, the final name may get uniquified by appending a digit at the end of the name.

    Is a lower priority than suggestName, in that regardless of whether autoSeed was called, suggestName will always take precedence if it was called.

    returns

    this object

    Definition Classes
    Data → HasId
  13. def binding: Option[Binding]
    Attributes
    protected[chisel3]
    Definition Classes
    Data
  14. def binding_=(target: Binding): Unit
    Attributes
    protected
    Definition Classes
    Data
  15. def circuitName: String
    Attributes
    protected
    Definition Classes
    HasId
  16. def className: String

    Name for Pretty Printing

    Name for Pretty Printing

    Definition Classes
    BundleRecord
  17. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  18. def cloneType: PipeIO.this.type

    Internal API; Chisel users should look at chisel3.chiselTypeOf(...).

    Internal API; Chisel users should look at chisel3.chiselTypeOf(...).

    cloneType must be defined for any Chisel object extending Data. It is responsible for constructing a basic copy of the object being cloned.

    returns

    a copy of the object.

    Definition Classes
    BundleData
  19. val deq: Valid[T]

    Valid output.

    Valid output. Data will appear here latency cycles after being valid at enq.

  20. def do_asTypeOf[T <: Data](that: T)(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): T

    Definition Classes
    Data
  21. def do_asUInt(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): UInt

    Definition Classes
    AggregateData
  22. final lazy val elements: SeqMap[String, Data]

    The collection of Data

    The collection of Data

    Elements defined earlier in the Bundle are higher order upon serialization. For example:

    Definition Classes
    BundleRecord
    Example:
    1. class MyBundle extends Bundle {
        val foo = UInt(16.W)
        val bar = UInt(16.W)
      }
      // Note that foo is higher order because its defined earlier in the Bundle
      val bundle = Wire(new MyBundle)
      bundle.foo := 0x1234.U
      bundle.bar := 0x5678.U
      val uint = bundle.asUInt
      assert(uint === "h12345678".U) // This will pass
  23. val enq: Valid[T]

    Valid input

  24. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  25. def equals(that: Any): Boolean
    Definition Classes
    HasId → AnyRef → Any
  26. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  27. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  28. def getElements: Seq[Data]

    Returns a Seq of the immediate contents of this Aggregate, in order.

    Returns a Seq of the immediate contents of this Aggregate, in order.

    Definition Classes
    RecordAggregate
  29. final def getWidth: Int

    Returns the width, in bits, if currently known.

    Returns the width, in bits, if currently known.

    Definition Classes
    Data
  30. def hasSeed: Boolean

    returns

    Whether either autoName or suggestName has been called

    Definition Classes
    HasId
  31. def hashCode(): Int
    Definition Classes
    HasId → AnyRef → Any
  32. def ignoreSeq: Boolean

    Overridden by IgnoreSeqInBundle to allow arbitrary Seqs of Chisel elements.

    Overridden by IgnoreSeqInBundle to allow arbitrary Seqs of Chisel elements.

    Definition Classes
    Bundle
  33. def instanceName: String
    Definition Classes
    HasId → InstanceId
  34. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  35. def isLit: Boolean
    Definition Classes
    Data
  36. final def isWidthKnown: Boolean

    Returns whether the width is currently known.

    Returns whether the width is currently known.

    Definition Classes
    Data
  37. def litOption: Option[BigInt]

    Return an Aggregate's literal value if it is a literal, None otherwise.

    Return an Aggregate's literal value if it is a literal, None otherwise. If any element of the aggregate is not a literal with a defined width, the result isn't a literal.

    returns

    an Aggregate's literal value if it is a literal.

    Definition Classes
    AggregateData
  38. def litValue: BigInt

    Returns the literal value if this is a literal that is representable as bits, otherwise crashes.

    Returns the literal value if this is a literal that is representable as bits, otherwise crashes.

    Definition Classes
    Data
  39. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  40. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  41. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  42. def parentModName: String
    Definition Classes
    HasId → InstanceId
  43. def parentPathName: String
    Definition Classes
    HasId → InstanceId
  44. def pathName: String
    Definition Classes
    HasId → InstanceId
  45. def suggestName(seed: ⇒ String): PipeIO.this.type

    Takes the first seed suggested.

    Takes the first seed suggested. Multiple calls to this function will be ignored. If the final computed name conflicts with another name, it may get uniquified by appending a digit at the end.

    Is a higher priority than autoSeed, in that regardless of whether autoSeed was called, suggestName will always take precedence.

    seed

    The seed for the name of this component

    returns

    this object

    Definition Classes
    HasId
  46. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  47. final def toAbsoluteTarget: ReferenceTarget

    Returns a FIRRTL IsMember that refers to the absolute path to this object in the elaborated hardware graph

    Returns a FIRRTL IsMember that refers to the absolute path to this object in the elaborated hardware graph

    Definition Classes
    NamedComponent → InstanceId
  48. final def toNamed: ComponentName

    Returns a FIRRTL ComponentName that references this object

    Returns a FIRRTL ComponentName that references this object

    Definition Classes
    NamedComponent → InstanceId
    Note

    Should not be called until circuit elaboration is complete

  49. def toPrintable: Printable

    Default "pretty-print" implementation Analogous to printing a Map Results in "Bundle(elt0.name -> elt0.value, ...)"

    Default "pretty-print" implementation Analogous to printing a Map Results in "Bundle(elt0.name -> elt0.value, ...)"

    Definition Classes
    BundleRecordData
    Note

    The order is reversed from the order of elements in order to print the fields in the order they were defined

  50. def toString(): String

    The collection of Data

    The collection of Data

    This underlying datastructure is a ListMap because the elements must remain ordered for serialization/deserialization. Elements added later are higher order when serialized (this is similar to Vec). For example:

    // Assume we have some type MyRecord that creates a Record from the ListMap
    val record = MyRecord(ListMap("fizz" -> UInt(16.W), "buzz" -> UInt(16.W)))
    // "buzz" is higher order because it was added later than "fizz"
    record("fizz") := "hdead".U
    record("buzz") := "hbeef".U
    val uint = record.asUInt
    assert(uint === "hbeefdead".U) // This will pass
    Definition Classes
    Record → AnyRef → Any
  51. final def toTarget: ReferenceTarget

    Returns a FIRRTL ReferenceTarget that references this object

    Returns a FIRRTL ReferenceTarget that references this object

    Definition Classes
    NamedComponent → InstanceId
    Note

    Should not be called until circuit elaboration is complete

  52. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  53. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  54. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  55. final def widthOption: Option[Int]

    Returns Some(width) if the width is known, else None.

    Returns Some(width) if the width is known, else None.

    Definition Classes
    Data

Deprecated Value Members

  1. final macro def asUInt(dummy: Int*): UInt
    Definition Classes
    Data
    Annotations
    @deprecated
    Deprecated

    (Since version Chisel 3.5) Calling this function with an empty argument list is invalid in Scala 3. Use the form without parentheses instead

  2. def bindingToString: String
    Attributes
    protected
    Definition Classes
    Data
    Annotations
    @deprecated
    Deprecated

    (Since version Chisel 3.5.0) This was never intended to be visible to user-defined types

  3. def isLit(dummy: Int*): Boolean
    Definition Classes
    Data
    Annotations
    @deprecated
    Deprecated

    (Since version Chisel 3.5) Calling this function with an empty argument list is invalid in Scala 3. Use the form without parentheses instead

  4. def litOption(dummy: Int*): Option[BigInt]
    Definition Classes
    Data
    Annotations
    @deprecated
    Deprecated

    (Since version Chisel 3.5) Calling this function with an empty argument list is invalid in Scala 3. Use the form without parentheses instead

  5. def litValue(dummy: Int*): BigInt
    Definition Classes
    Data
    Annotations
    @deprecated
    Deprecated

    (Since version Chisel 3.5) Calling this function with an empty argument list is invalid in Scala 3. Use the form without parentheses instead

Inherited from Bundle

Inherited from Record

Inherited from Aggregate

Inherited from Data

Inherited from SourceInfoDoc

Inherited from NamedComponent

Inherited from HasId

Inherited from internal.InstanceId

Inherited from AnyRef

Inherited from Any

Connect

Utilities for connecting hardware components

Signals

Ungrouped

SourceInfoTransformMacro

These internal methods are not part of the public-facing API!

The equivalent public-facing methods do not have the do_ prefix or have the same name. Use and look at the documentation for those. If you want left shift, use <<, not do_<<. If you want conversion to a Seq of Bools look at the asBools above, not the one below. Users can safely ignore every method in this group!

🐉🐉🐉 Here be dragons... 🐉🐉🐉

These do_X methods are used to enable both implicit passing of SourceInfo and chisel3.CompileOptions while also supporting chained apply methods. In effect all "normal" methods that you, as a user, will use in your designs, are converted to their "hidden", do_*, via macro transformations. Without using macros here, only one of the above wanted behaviors is allowed (implicit passing and chained applies)---the compiler interprets a chained apply as an explicit 'implicit' argument and will throw type errors.

The "normal", public-facing methods then take no SourceInfo. However, a macro transforms this public-facing method into a call to an internal, hidden do_* that takes an explicit SourceInfo by inserting an implicitly[SourceInfo] as the explicit argument.