chisel6.4.0 < Back


# Packages

-  package root
  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
-  package circt
  Definition Classes
    util
-  package experimental
  Definition Classes
    util
-  package random
  Definition Classes
    util
- Arbiter
- ArbiterIO
- BinaryMemoryFile
- BinaryToGray
- BitPat
- Cat
- Counter
- Decoupled
- DecoupledIO
- DeqIO
- EnqIO
- Enum
- Fill
- FillInterleaved
- GrayToBinary
- HasBlackBoxInline
- HasBlackBoxPath
- HasBlackBoxResource
- HasExtModuleInline
- HasExtModulePath
- HasExtModuleResource
- HexMemoryFile
- ImplicitConversions
- Irrevocable
- IrrevocableIO
- ListLookup
- LockingArbiter
- LockingArbiterLike
- LockingRRArbiter
- Log2
- Lookup
- MemoryFile
- MemoryReadPort
- MemoryReadWritePort
- MemoryWritePort
- MixedVec
- MixedVecInit
- Mux1H
- MuxCase
- MuxLookup
- OHToUInt
- Pipe
- PopCount
- PriorityEncoder
- PriorityEncoderOH
- PriorityMux
- Queue
- QueueIO
- RRArbiter
- ReadyValidIO
- RegEnable
- Reverse
- SRAM
- SRAMInterface
- ShiftRegister
- ShiftRegisters
- SparseVec
- SwitchContext
- UIntToOH
- Valid
- is
- isPow2
- log2Ceil
- log2Down
- log2Floor
- log2Up
- pla
- scanLeftOr
- scanRightOr
- signedBitLength
- simpleClassName
- switch
- unsignedBitLength

o

chisel3.util

# Log2

###

#### object Log2

Returns the base-2 integer logarithm of an UInt.

Source
  CircuitMath.scala
Example:

1.     Log2(8.U)  // evaluates to 3.U
       Log2(13.U)  // evaluates to 3.U (truncation)
       Log2(myUIntWire)

Note

  The result is truncated, so e.g. Log2(13.U) === 3.U

Linear Supertypes
AnyRef, Any

Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. Log2
2. AnyRef
3. Any

1. Hide All
2. Show All

Visibility

1. Public
2. Protected

### Value Members

1.  final def !=(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
2.  final def ##: Int
   Definition Classes
     AnyRef → Any
3.  final def ==(arg0: Any): Boolean
   Definition Classes
     AnyRef → Any
4.  def apply(x: Bits): UInt
5.  def apply(x: Bits, width: Int): UInt

   Returns the base-2 integer logarithm of the least-significant `width` bits of an UInt.

6.  final def asInstanceOf[T0]: T0
   Definition Classes
     Any
7.  def clone(): AnyRef
   Attributes
     protected[lang]
   Definition Classes
     AnyRef
   Annotations
     @throws(classOf[java.lang.CloneNotSupportedException]) @native()
8.  final def eq(arg0: AnyRef): Boolean
   Definition Classes
     AnyRef
9.  def equals(arg0: AnyRef): Boolean
   Definition Classes
     AnyRef → Any
10.  def finalize(): Unit
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.Throwable])
11.  final def getClass(): Class[_ <: AnyRef]
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
12.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
13.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
14.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
15.  final def notify(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
16.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
17.  final def synchronized[T0](arg0: => T0): T0
    Definition Classes
      AnyRef
18.  def toString(): String
    Definition Classes
      AnyRef → Any
19.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException])
20.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException])
21.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException]) @native()

### Inherited from AnyRef

### Inherited from Any

### Ungrouped