chisel.lib.dclib.DCCrossbar.scala Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of ip-contributions_2.12 Show documentation

ip-contributions

The newest version!

package chisel.lib.dclib

import chisel3._
import chisel3.util.{log2Ceil, DecoupledIO}

/**
  * A simple crossbar to connect M inputs to N outputs.  The crossbar should be
  * nonblocking in that as long as inputs do not request the same output all
  * transactions can completed simultaneously.
  *
  * Implemented using DCDemux and DCArbiter
  */
class DCCrossbar[D <: Data](data: D, inputs: Int, outputs: Int) extends Module {
  val io = IO(new Bundle {
    val sel = Input(Vec(inputs, UInt(log2Ceil(outputs).W)))
    val c = Vec(inputs, Flipped(new DecoupledIO(data.cloneType)))
    val p = Vec(outputs, new DecoupledIO(data.cloneType))
  })

  override def desiredName: String = "DCCrossbar_" + data.toString + "_M" + inputs + "N" + outputs

  if ((inputs == 1) && (outputs == 1)) {
    io.p(0) <> io.c(0)
  } else {
    val demuxList = for (i <- 0 until inputs) yield Module(new DCDemux(data, outputs))
    val arbList = for (i <- 0 until outputs) yield Module(new DCArbiter(data, inputs, false))
    for (i <- 0 until inputs) {
      demuxList(i).io.c <> io.c(i)
      demuxList(i).io.sel := io.sel(i)

      for (j <- 0 until outputs) {
        demuxList(i).io.p(j) <> arbList(j).io.c(i)
      }
    }
    for (i <- 0 until outputs) {
      arbList(i).io.p <> io.p(i)
    }
  }
}