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----
-layout: docs
-title: "Troubleshooting"
-section: "chisel3"
----
-This page is a starting point for recording common and not so common problems in developing with Chisel3. In particular, those situations where there is a work around that will keep you going.
-
-### `type mismatch` specifying width/value of a `UInt`/`SInt`
-
-*I have some old code that used to work correctly in chisel2 (and still does if I use the `import Chisel._` compatibility layer)
-but causes a `type mismatch` error in straight chisel3:*
-
-```scala
-class TestBlock extends Module {
- val io = IO(new Bundle {
- val output = Output(UInt(width=3))
- })
-}
-```
-*produces*
-```bash
-type mismatch;
-[error] found : Int(3)
-[error] required: chisel3.internal.firrtl.Width
-[error] val output = Output(UInt(width=3))
-```
-
-The single argument, multi-function object/constructors from chisel2 have been removed from chisel3.
-It was felt these were too prone to error and made it difficult to diagnose error conditions in chisel3 code.
-
-In chisel3, the single argument to the `UInt`/`SInt` object/constructor specifies the *width* and must be a `Width` type.
-Although there are no automatic conversions from `Int` to `Width`, an `Int` may be converted to a `Width` by applying the `W` method to an `Int`.
-In chisel3, the above code becomes:
-```scala
-class TestBlock extends Module {
- val io = IO(new Bundle {
- val output = Output(UInt(3.W))
- })
-}
-```
-`UInt`/`SInt` literals may be created from an `Int` with the application of either the `U` or `S` method.
-
-```scala
-UInt(42)
-```
-in chisel2, becomes
-```scala
-42.U
-```
-in chisel3
-
-A literal with a specific width is created by calling the `U` or `S` method with a `W` argument.
-Use:
-```scala
-1.S(8.W)
-```
-to create an 8-bit wide (signed) literal with value 1.