spinal.lib.misc.plic.PlicTarget.scala Maven / Gradle / Ivy
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package spinal.lib.misc.plic
import spinal.core._
import spinal.lib._
import spinal.lib.bus.misc.BusSlaveFactory
import scala.collection.Seq
case class PlicTarget(id : Int, gateways : Seq[PlicGateway], priorityWidth : Int) extends Area{
assert(gateways.map(_.id).distinct.length == gateways.length, "PLIC gatways have duplicated ID")
val ie = Vec.fill(gateways.length)(Bool())
val threshold = UInt(priorityWidth bits)
val idWidth = log2Up((gateways.map(_.id) ++ Seq(0)).max + 1)
def Request(priority : UInt, id : UInt, valid : Bool) = {
val ret = new Request
ret.priority := priority
ret.id := id
ret.valid := valid
ret
}
case class Request() extends Bundle{
val priority = UInt(priorityWidth bits)
val id = UInt(idWidth bits)
val valid = Bool()
}
val requests = Request(U(0),U(0), True) +: gateways.zipWithIndex.sortBy(_._1.id).map(g =>
Request(
priority = g._1.priority,
id = U(g._1.id),
valid = g._1.ip && ie(g._2)
)
)
val bestRequest = RegNext(requests.reduceBalancedTree((a, b) => {
val takeA = !b.valid || (a.valid && a.priority >= b.priority)
takeA ? a | b
}))
val iep = bestRequest.priority > threshold
val claim = iep ? bestRequest.id | 0
}
// def claim(id : UInt): Unit = {
// switch(id){
// for(gateway <- gateways){
// is(gateway.id){
// gateway.doClaim()
// }
// }
// }
// }
// def driveFrom(bus : BusSlaveFactory, ieBase : BigInt, thresholdBase : BigInt): Unit ={
//
// }