BackendCommons.scala

/**************************************************************************************
* Copyright (c) 2020 Institute of Computing Technology, CAS
* Copyright (c) 2020 University of Chinese Academy of Sciences
* 
* NutShell is licensed under Mulan PSL v2.
* You can use this software according to the terms and conditions of the Mulan PSL v2. 
* You may obtain a copy of Mulan PSL v2 at:
*             http://license.coscl.org.cn/MulanPSL2 
* 
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER 
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR 
* FIT FOR A PARTICULAR PURPOSE.  
*
* See the Mulan PSL v2 for more details.  
***************************************************************************************/

package nutcore.backend

import chisel3._
import chisel3.util._
import chisel3.util.experimental.BoringUtils

import nutcore._

import utils._
import bus.simplebus._
import difftest._

trait HasBackendConst{
  // val multiIssue = true
  val robSize = 16
  val robWidth = 2
  val robInstCapacity = robSize * robWidth
  val checkpointSize = 4 // register map checkpoint size
  val brTagWidth = log2Up(checkpointSize)
  val prfAddrWidth = log2Up(robSize) + log2Up(robWidth) // physical rf addr width

  val DispatchWidth = 2
  val CommitWidth = 2
  val RetireWidth = 2

  val enableCheckpoint = true
}