我正在学习凿子下面的文档on GithubChisel3。功能模块Mux4
到目前为止,一切工作完美无瑕。但我卡在第13章,"Functional Module Creation"
我无法让代码工作。我创建了凿模板项目的副本我所有的.scala类。下面是我写/复制与可变位宽创建MUX4:
/凿模板/ src目录/主/斯卡拉/ Mux4.scala
import Chisel._
class Mux4(w: Int) extends Module {
val io = IO(new Bundle {
val sel = UInt(INPUT, 2)
val in0 = UInt(INPUT, w)
val in1 = UInt(INPUT, w)
val in2 = UInt(INPUT, w)
val in3 = UInt(INPUT, w)
val out = UInt(OUTPUT, w)
})
io.out := Mux2(io.sel(1),
Mux2(io.sel(0), io.in0, io.in1),
Mux2(io.sel(0), io.in2, io.in3))
}
class Mux2(w: Int) extends Module {
val io = IO(new Bundle {
val sel = Bool(INPUT)
val in0 = UInt(INPUT, w)
val in1 = UInt(INPUT, w)
val out = UInt(OUTPUT, w)
})
when(io.sel) {
io.out := io.in0
}.otherwise {
io.out := io.in1
}
}
object Mux2 {
def apply(sel: UInt, in0: UInt, in1: UInt): UInt = {
val m = new Mux2(in0.getWidth)
m.io.sel := sel.toBool()
m.io.in0 := in0
m.io.in1 := in1
m.io.out
}
}
测试仪阶i类写道:
/凿模板/ src目录/测试/斯卡拉/ Mux4Test.scala
import Chisel.iotesters.{ChiselFlatSpec, Driver, PeekPokeTester}
class Mux4Test(c: Mux4) extends PeekPokeTester(c) {
val sel = 3
val (in0, in1, in2, in3) = (5, 7, 11, 15)
poke(c.io.sel, sel)
poke(c.io.in0, in0)
poke(c.io.in1, in1)
poke(c.io.in2, in2)
poke(c.io.in3, in3)
step(1)
System.out.println("Circuit: "+peek(c.io.out)
+" Expected: "+TestMux4.result(sel, in0, in1, in2, in3))
}
object TestMux4{
def result(sel: Int, in0: Int, in1: Int, in2: Int, in3: Int): Int = {
val out = sel match{
case 0 => in3
case 1 => in2
case 2 => in1
case 3 => in0
}
out
}
}
class Mux4Tester extends ChiselFlatSpec {
behavior of "Mux4"
backends foreach {backend =>
it should s"do Mux4 $backend" in {
Driver(() => new Mux4(4), backend)(c => new Mux4Test(c)) should be (true)
}
}
}
最重要的部分从输出
STEP 0 -> 1
Circuit: 0 Expected: 5
的MUX4类(电路)返回0作为输出,而它应该是5,这是因为选择过程如下:
00 - > IO .OUT = IN3 = 15
01 - > io.out = IN2 = 11
10 - > io.out = IN1 = 7
11 - > io.out = IN0 = 5
在Mux4Test.scala类我写VAL SEL = 3。这样做的比特表示是,因此,我期望IN0 = 5。
我在哪里错了?
我也只是意识到实际维基的例子有同样的错误。我很抱歉!我马上解决它。 – jkoenig
谢谢你的回答快@jkoenig。现在它工作了! – mtosch
我也预解码修复,以确保此错误是夹在未来,对不起任何挫折这就造成了! – jkoenig