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// See LICENSE for license details.
package chiselTests
import scala.collection.mutable.Stack
import chisel3._
import chisel3.util._
class ChiselStack(val depth: Int) extends Module {
val io = IO(new Bundle {
val push = Input(Bool())
val pop = Input(Bool())
val en = Input(Bool())
val dataIn = Input(UInt.width(32))
val dataOut = Output(UInt.width(32))
})
val stack_mem = Mem(depth, UInt.width(32))
val sp = Reg(init = UInt(0, width = log2Up(depth + 1)))
val out = Reg(init = UInt(0, width = 32))
when (io.en) {
when(io.push && (sp < UInt(depth))) {
stack_mem(sp) := io.dataIn
sp := sp +% UInt(1)
} .elsewhen(io.pop && (sp > UInt(0))) {
sp := sp -% UInt(1)
}
when (sp > UInt(0)) {
out := stack_mem(sp -% UInt(1))
}
}
io.dataOut := out
}
/*
class StackTester(c: Stack) extends Tester(c) {
var nxtDataOut = 0
var dataOut = 0
val stack = new ScalaStack[Int]()
for (t <- 0 until 16) {
val enable = rnd.nextInt(2)
val push = rnd.nextInt(2)
val pop = rnd.nextInt(2)
val dataIn = rnd.nextInt(256)
if (enable == 1) {
dataOut = nxtDataOut
if (push == 1 && stack.length < c.depth) {
stack.push(dataIn)
} else if (pop == 1 && stack.length > 0) {
stack.pop()
}
if (stack.length > 0) {
nxtDataOut = stack.top
}
}
poke(c.io.pop, pop)
poke(c.io.push, push)
poke(c.io.en, enable)
poke(c.io.dataIn, dataIn)
step(1)
expect(c.io.dataOut, dataOut)
}
}
*/
class StackSpec extends ChiselPropSpec {
property("Stack should elaborate") {
elaborate { new ChiselStack(2) }
}
ignore("StackTester should return the correct result") { }
}
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