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// See LICENSE for license details.
package chiselTests
import org.scalatest._
import chisel3._
import chisel3.testers.BasicTester
import chisel3.util._
class WhenTester() extends BasicTester {
val cnt = Counter(4)
when(Bool(true)) { cnt.inc() }
val out = Wire(UInt.width(3))
when(cnt.value === UInt.Lit(0)) {
out := UInt.Lit(1)
} .elsewhen (cnt.value === UInt.Lit(1)) {
out := UInt.Lit(2)
} .elsewhen (cnt.value === UInt.Lit(2)) {
out := UInt.Lit(3)
} .otherwise {
out := UInt.Lit(0)
}
assert(out === cnt.value + UInt.Lit(1))
when(cnt.value === UInt.Lit(3)) {
stop()
}
}
class OverlappedWhenTester() extends BasicTester {
val cnt = Counter(4)
when(Bool(true)) { cnt.inc() }
val out = Wire(UInt.width(3))
when(cnt.value <= UInt.Lit(0)) {
out := UInt.Lit(1)
} .elsewhen (cnt.value <= UInt.Lit(1)) {
out := UInt.Lit(2)
} .elsewhen (cnt.value <= UInt.Lit(2)) {
out := UInt.Lit(3)
} .otherwise {
out := UInt.Lit(0)
}
assert(out === cnt.value + UInt.Lit(1))
when(cnt.value === UInt.Lit(3)) {
stop()
}
}
class WhenSpec extends ChiselFlatSpec {
"When, elsewhen, and otherwise with orthogonal conditions" should "work" in {
assertTesterPasses{ new WhenTester }
}
"When, elsewhen, and otherwise with overlapped conditions" should "work" in {
assertTesterPasses{ new OverlappedWhenTester }
}
}
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