In this lab you shall write test code for a 5:1 multiplexer. The interface of the multiplexer is:

class Mux5 extends Module {
  val io = IO(new Bundle {
    val a = Input(UInt(8.W))
    val b = Input(UInt(8.W))
    val c = Input(UInt(8.W))
    val d = Input(UInt(8.W))
    val e = Input(UInt(8.W))
    val sel = Input(UInt(3.W))
    val y = Output(UInt(8.W))
  })
  .....
}

Write the test code for the Mux5 implementation. Try not to look into the implementation. The implementation has errors. Your job is to show those errors with your test code. You do not need to correct the errors in Mux5.

There is no starting code given. You need to start from scratch (look into an older lab for test examples).

• Use ChiselTest and place your code in src/test/scala, and run your test with sbt test.

• Chapter 3 of Digital Design with Chisel

With IntelliJ import the lab project as follows:

• Start IntelliJ
• Click Import Project, or on a running IntelliJ: File - New - Project from Existing Source...
• Navigate to .../lab5 and select the file build.sbt, press Open
• Press OK on the next dialog box