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// See LICENSE for license details.
package chiselTests
import chisel3._
import chisel3.testers.BasicTester
import chisel3.util._
/**
* This test used to fail when assignment statements were
* contained in DeqIO and EnqIO constructors.
* The symptom is creation of a firrtl file
* with missing declarations, the problem is exposed by
* the creation of the val outs in VectorPacketIO
*
* NOTE: The problem does not exist now because the initialization
* code has been removed from DeqIO and EnqIO
*
* IMPORTANT: The canonical way to initialize a decoupled inteface is still being debated.
*/
class Packet extends Bundle {
val header = UInt(1.W)
}
/**
* The problem occurs with just the ins or the outs
* lines also.
* The problem does not occur if the Vec is taken out
*/
class VectorPacketIO(val n: Int) extends Bundle {
val ins = Vec(n, chisel3.util.DeqIO(new Packet()))
val outs = Vec(n, chisel3.util.EnqIO(new Packet()))
}
/**
* a module uses the vector based IO bundle
* the value of n does not affect the error
*/
class BrokenVectorPacketModule extends Module {
val n = 4
val io = IO(new VectorPacketIO(n))
// Avoid a "Reference io is not fully initialized" error from firrtl.
for (i <- 0 until n) {
io.outs(i) <> io.ins(i)
}
/* the following method of initializing the circuit may change in the future */
io.ins.foreach(_.nodeq())
io.outs.foreach(_.noenq())
}
class VectorPacketIOUnitTester extends BasicTester {
val dut = Module(new BrokenVectorPacketModule)
dut.io <> DontCare
// This counter just makes the test end quicker
val c = Counter(1)
when(c.inc()) {
stop()
}
}
class VectorPacketIOUnitTesterSpec extends ChiselFlatSpec {
"a circuit using an io containing a vector of EnqIO wrapped packets" should
"compile and run" in {
assertTesterPasses {
new VectorPacketIOUnitTester
}
}
}
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