diff --git a/chisel/playground/src/Core.scala b/chisel/playground/src/Core.scala
index fbf9d7b..c5760a1 100644
--- a/chisel/playground/src/Core.scala
+++ b/chisel/playground/src/Core.scala
@@ -7,7 +7,7 @@ import chisel3.internal.DontCareBinding
 import defines._
 import defines.Const._
 import pipeline.fetch._
-import pipeline.decoder._
+import pipeline.decode._
 import pipeline.execute._
 import pipeline.memory._
 import pipeline.writeback._
@@ -28,7 +28,7 @@ class Core(implicit val cpuConfig: CpuConfig) extends Module {
   val fetchUnit      = Module(new FetchUnit()).io
   val bpu            = Module(new BranchPredictorUnit()).io
   val instFifo       = Module(new InstFifo()).io
-  val decoderUnit    = Module(new DecoderUnit()).io
+  val decodeUnit     = Module(new DecodeUnit()).io
   val regfile        = Module(new ARegFile()).io
   val executeStage   = Module(new ExecuteStage()).io
   val executeUnit    = Module(new ExecuteUnit()).io
@@ -48,7 +48,7 @@ class Core(implicit val cpuConfig: CpuConfig) extends Module {
   dtlbL1.cache <> io.data.tlb
   dtlbL1.csr <> csr.tlb
 
-  ctrl.decoderUnit <> decoderUnit.ctrl
+  ctrl.decodeUnit <> decodeUnit.ctrl
   ctrl.executeUnit <> executeUnit.ctrl
   ctrl.memoryUnit <> memoryUnit.ctrl
   ctrl.writeBackUnit <> writeBackUnit.ctrl
@@ -56,7 +56,7 @@ class Core(implicit val cpuConfig: CpuConfig) extends Module {
 
   fetchUnit.memory <> memoryUnit.fetchUnit
   fetchUnit.execute <> executeUnit.fetchUnit
-  fetchUnit.decoder <> decoderUnit.fetchUnit
+  fetchUnit.decode <> decodeUnit.fetchUnit
   fetchUnit.instFifo.full     := instFifo.full
   fetchUnit.iCache.inst_valid := io.inst.inst_valid
   io.inst.addr(0)             := fetchUnit.iCache.pc
@@ -65,12 +65,12 @@ class Core(implicit val cpuConfig: CpuConfig) extends Module {
     io.inst.addr(i) := fetchUnit.iCache.pc_next + ((i - 1) * 4).U
   }
 
-  bpu.decoder <> decoderUnit.bpu
+  bpu.decode <> decodeUnit.bpu
   bpu.execute <> executeUnit.bpu
 
-  instFifo.do_flush := ctrl.decoderUnit.do_flush
-  instFifo.ren <> decoderUnit.instFifo.allow_to_go
-  decoderUnit.instFifo.inst <> instFifo.read
+  instFifo.do_flush := ctrl.decodeUnit.do_flush
+  instFifo.ren <> decodeUnit.instFifo.allow_to_go
+  decodeUnit.instFifo.inst <> instFifo.read
 
   for (i <- 0 until cpuConfig.instFetchNum) {
     instFifo.write(i).pht_index := bpu.instBuffer.pht_index(i)
@@ -81,25 +81,25 @@ class Core(implicit val cpuConfig: CpuConfig) extends Module {
     instFifo.write(i).acc_err   := io.inst.acc_err
   }
 
-  decoderUnit.instFifo.info.empty        := instFifo.empty
-  decoderUnit.instFifo.info.almost_empty := instFifo.almost_empty
-  decoderUnit.regfile <> regfile.read
+  decodeUnit.instFifo.info.empty        := instFifo.empty
+  decodeUnit.instFifo.info.almost_empty := instFifo.almost_empty
+  decodeUnit.regfile <> regfile.read
   for (i <- 0 until (cpuConfig.commitNum)) {
-    decoderUnit.forward(i).exe      := executeUnit.decoderUnit.forward(i).exe
-    decoderUnit.forward(i).mem_wreg := executeUnit.decoderUnit.forward(i).exe_mem_wreg
-    decoderUnit.forward(i).mem      := memoryUnit.decoderUnit(i)
+    decodeUnit.forward(i).exe      := executeUnit.decodeUnit.forward(i).exe
+    decodeUnit.forward(i).mem_wreg := executeUnit.decodeUnit.forward(i).exe_mem_wreg
+    decodeUnit.forward(i).mem      := memoryUnit.decodeUnit(i)
   }
-  decoderUnit.csr <> csr.decoderUnit
-  decoderUnit.executeStage <> executeStage.decoderUnit
+  decodeUnit.csr <> csr.decodeUnit
+  decodeUnit.executeStage <> executeStage.decodeUnit
 
   executeStage.ctrl.clear(0) := ctrl.memoryUnit.flush ||
     ctrl.executeUnit.do_flush && ctrl.executeUnit.allow_to_go ||
-    !ctrl.decoderUnit.allow_to_go && ctrl.executeUnit.allow_to_go
+    !ctrl.decodeUnit.allow_to_go && ctrl.executeUnit.allow_to_go
   executeStage.ctrl.clear(1) := ctrl.memoryUnit.flush ||
-    (ctrl.executeUnit.do_flush && decoderUnit.instFifo.allow_to_go(1)) ||
-    (ctrl.executeUnit.allow_to_go && !decoderUnit.instFifo.allow_to_go(1))
+    (ctrl.executeUnit.do_flush && decodeUnit.instFifo.allow_to_go(1)) ||
+    (ctrl.executeUnit.allow_to_go && !decodeUnit.instFifo.allow_to_go(1))
   executeStage.ctrl.allow_to_go(0) := ctrl.executeUnit.allow_to_go
-  executeStage.ctrl.allow_to_go(1) := decoderUnit.instFifo.allow_to_go(1)
+  executeStage.ctrl.allow_to_go(1) := decodeUnit.instFifo.allow_to_go(1)
 
   executeUnit.executeStage <> executeStage.executeUnit
   executeUnit.csr <> csr.executeUnit
diff --git a/chisel/playground/src/CpuConfig.scala b/chisel/playground/src/CpuConfig.scala
index 1571e8d..6288343 100644
--- a/chisel/playground/src/CpuConfig.scala
+++ b/chisel/playground/src/CpuConfig.scala
@@ -52,8 +52,8 @@ case class CacheConfig(
   val bankIndexWidth  = log2Ceil(nbank) // bank index的位宽
   val bankOffsetWidth = log2Ceil(bytesPerBank) // bank offset的位宽
   val offsetWidth     = bankIndexWidth + bankOffsetWidth // offset的位宽
-  val tagWidth        = PADDR_WID - offsetLen // tag的位宽
-  require(offsetWidth + indexWidth == offsetLen) // offsetLen是页内偏移的位宽，为简化设计，这里直接保证每路容量等于页大小
+  val tagWidth        = PADDR_WID - pageOffsetLen // tag的位宽
+  require(offsetWidth + indexWidth == pageOffsetLen) // offsetLen是页内偏移的位宽，为简化设计，这里直接保证每路容量等于页大小
   require(isPow2(nindex))
   require(isPow2(nway))
   require(isPow2(nbank))
diff --git a/chisel/playground/src/cache/mmu/DTlb.scala b/chisel/playground/src/cache/mmu/DTlb.scala
index 8a3d53a..b6d880f 100644
--- a/chisel/playground/src/cache/mmu/DTlb.scala
+++ b/chisel/playground/src/cache/mmu/DTlb.scala
@@ -27,7 +27,7 @@ class DTlb extends Module with Sv39Const {
   io.cache.uncached       := AddressSpace.isMMIO(io.addr)
   io.cache.translation_ok := true.B
   io.cache.hit_L2         := true.B
-  io.cache.ptag           := io.addr(PADDR_WID - 1, offsetLen)
-  io.cache.paddr          := Cat(io.cache.ptag, io.addr(offsetLen - 1, 0))
+  io.cache.ptag           := io.addr(PADDR_WID - 1, pageOffsetLen)
+  io.cache.paddr          := Cat(io.cache.ptag, io.addr(pageOffsetLen - 1, 0))
 
 }
diff --git a/chisel/playground/src/cache/mmu/ITlb.scala b/chisel/playground/src/cache/mmu/ITlb.scala
index b5dd13a..8525796 100644
--- a/chisel/playground/src/cache/mmu/ITlb.scala
+++ b/chisel/playground/src/cache/mmu/ITlb.scala
@@ -17,7 +17,7 @@ class Tlb_ICache extends Bundle {
   val paddr          = Output(UInt(PADDR_WID.W))
 }
 
-class ITlb extends Module with Sv39Const with HasCSRConst {
+class ITlb extends Module with HasTlbConst with HasCSRConst {
   val io = IO(new Bundle {
     val addr  = Input(UInt(XLEN.W))
     val cache = new Tlb_ICache()
@@ -29,11 +29,12 @@ class ITlb extends Module with Sv39Const with HasCSRConst {
   val mode = WireInit(io.csr.mode)
 
   val vm_enabled = (satp.asTypeOf(satpBundle).mode === 8.U) && (mode < ModeM)
+  val itlb       = RegInit(0.U.asTypeOf(tlbBundle))
 
   io.cache.uncached       := AddressSpace.isMMIO(io.addr)
   io.cache.translation_ok := !vm_enabled
   io.cache.hit_L2         := true.B
-  io.cache.ptag           := Mux(vm_enabled, DontCare, io.addr(PADDR_WID - 1, offsetLen))
-  io.cache.paddr          := Cat(io.cache.ptag, io.addr(offsetLen - 1, 0))
+  io.cache.ptag           := Mux(vm_enabled, DontCare, io.addr(PADDR_WID - 1, pageOffsetLen))
+  io.cache.paddr          := Cat(io.cache.ptag, io.addr(pageOffsetLen - 1, 0))
 
 }
diff --git a/chisel/playground/src/ctrl/Ctrl.scala b/chisel/playground/src/ctrl/Ctrl.scala
index d18afe5..cbbf300 100644
--- a/chisel/playground/src/ctrl/Ctrl.scala
+++ b/chisel/playground/src/ctrl/Ctrl.scala
@@ -10,31 +10,31 @@ class Ctrl(implicit val cpuConfig: CpuConfig) extends Module {
   val io = IO(new Bundle {
     val cacheCtrl     = Flipped(new CacheCtrl())
     val fetchUnit     = Flipped(new FetchUnitCtrl())
-    val decoderUnit   = Flipped(new DecoderUnitCtrl())
+    val decodeUnit    = Flipped(new DecodeUnitCtrl())
     val executeUnit   = Flipped(new ExecuteCtrl())
     val memoryUnit    = Flipped(new MemoryCtrl())
     val writeBackUnit = Flipped(new WriteBackCtrl())
   })
 
   val inst0_lw_stall = (io.executeUnit.inst(0).mem_wreg) && io.executeUnit.inst(0).reg_waddr.orR &&
-    (io.decoderUnit.inst0.src1.ren && io.decoderUnit.inst0.src1.raddr === io.executeUnit.inst(0).reg_waddr ||
-      io.decoderUnit.inst0.src2.ren && io.decoderUnit.inst0.src2.raddr === io.executeUnit.inst(0).reg_waddr)
+    (io.decodeUnit.inst0.src1.ren && io.decodeUnit.inst0.src1.raddr === io.executeUnit.inst(0).reg_waddr ||
+      io.decodeUnit.inst0.src2.ren && io.decodeUnit.inst0.src2.raddr === io.executeUnit.inst(0).reg_waddr)
   val inst1_lw_stall = (io.executeUnit.inst(1).mem_wreg) && io.executeUnit.inst(1).reg_waddr.orR &&
-    (io.decoderUnit.inst0.src1.ren && io.decoderUnit.inst0.src1.raddr === io.executeUnit.inst(1).reg_waddr ||
-      io.decoderUnit.inst0.src2.ren && io.decoderUnit.inst0.src2.raddr === io.executeUnit.inst(1).reg_waddr)
+    (io.decodeUnit.inst0.src1.ren && io.decodeUnit.inst0.src1.raddr === io.executeUnit.inst(1).reg_waddr ||
+      io.decodeUnit.inst0.src2.ren && io.decodeUnit.inst0.src2.raddr === io.executeUnit.inst(1).reg_waddr)
   val lw_stall = inst0_lw_stall || inst1_lw_stall
   // TODO: 这里的stall信号可以改进，尝试让前后端完全解耦
   val longest_stall =
     io.executeUnit.fu_stall || io.cacheCtrl.iCache_stall || io.memoryUnit.mem_stall
 
   io.fetchUnit.allow_to_go     := !io.cacheCtrl.iCache_stall
-  io.decoderUnit.allow_to_go   := !(lw_stall || longest_stall)
+  io.decodeUnit.allow_to_go    := !(lw_stall || longest_stall)
   io.executeUnit.allow_to_go   := !longest_stall
   io.memoryUnit.allow_to_go    := !longest_stall
   io.writeBackUnit.allow_to_go := !longest_stall || io.memoryUnit.flush
 
   io.fetchUnit.do_flush     := false.B
-  io.decoderUnit.do_flush   := io.memoryUnit.flush || io.executeUnit.flush || io.decoderUnit.branch
+  io.decodeUnit.do_flush    := io.memoryUnit.flush || io.executeUnit.flush || io.decodeUnit.branch
   io.executeUnit.do_flush   := io.memoryUnit.flush || io.executeUnit.flush
   io.memoryUnit.do_flush    := io.memoryUnit.flush
   io.writeBackUnit.do_flush := false.B
diff --git a/chisel/playground/src/defines/Bundles.scala b/chisel/playground/src/defines/Bundles.scala
index 60ce5a4..ef0fed0 100644
--- a/chisel/playground/src/defines/Bundles.scala
+++ b/chisel/playground/src/defines/Bundles.scala
@@ -62,7 +62,7 @@ class FetchUnitCtrl extends Bundle {
   val do_flush    = Input(Bool())
 }
 
-class DecoderUnitCtrl extends Bundle {
+class DecodeUnitCtrl extends Bundle {
   val inst0 = Output(new Bundle {
     val src1 = new SrcReadSignal()
     val src2 = new SrcReadSignal()
diff --git a/chisel/playground/src/defines/TlbBundles.scala b/chisel/playground/src/defines/TlbBundles.scala
index 7cc8eec..3f0edb7 100644
--- a/chisel/playground/src/defines/TlbBundles.scala
+++ b/chisel/playground/src/defines/TlbBundles.scala
@@ -7,20 +7,18 @@ import cpu.CacheConfig
 import cpu.TLBConfig
 
 trait Sv39Const extends CoreParameter {
-  val PAddrBits = PADDR_WID
-  val Level     = 3
-  val offsetLen = 12
-  val ppn0Len   = 9
-  val ppn1Len   = 9
-  val ppn2Len   = PAddrBits - offsetLen - ppn0Len - ppn1Len // 2
-  val ppnLen    = ppn2Len + ppn1Len + ppn0Len
-  val vpn2Len   = 9
-  val vpn1Len   = 9
-  val vpn0Len   = 9
-  val vpnLen    = vpn2Len + vpn1Len + vpn0Len
+  val PAddrBits     = PADDR_WID // 32
+  val level         = 3
+  val pageOffsetLen = 12 // 页面大小为4KB，对应的偏移量长度为12位
+  val ppn0Len       = 9
+  val ppn1Len       = 9
+  val ppn2Len       = PAddrBits - pageOffsetLen - ppn0Len - ppn1Len // 2
+  val ppnLen        = ppn2Len + ppn1Len + ppn0Len // 20
+  val vpn2Len       = 9
+  val vpn1Len       = 9
+  val vpn0Len       = 9
+  val vpnLen        = vpn2Len + vpn1Len + vpn0Len // 27
 
-  //val paddrLen = PAddrBits
-  //val vaddrLen = VAddrBits
   val satpLen     = XLEN
   val satpModeLen = 4
   val asidLen     = 16
@@ -28,25 +26,23 @@ trait Sv39Const extends CoreParameter {
 
   val ptEntryLen = XLEN
   val satpResLen = XLEN - ppnLen - satpModeLen - asidLen
-  //val vaResLen = 25 // unused
-  //val paResLen = 25 // unused
-  val pteResLen = XLEN - ppnLen - 2 - flagLen
+  val pteResLen  = XLEN - ppnLen - 2 - flagLen
 
   def vaBundle = new Bundle {
     val vpn2   = UInt(vpn2Len.W)
     val vpn1   = UInt(vpn1Len.W)
     val vpn0   = UInt(vpn0Len.W)
-    val offset = UInt(offsetLen.W)
+    val offset = UInt(pageOffsetLen.W)
   }
 
   def vaBundle2 = new Bundle {
     val vpn    = UInt(vpnLen.W)
-    val offset = UInt(offsetLen.W)
+    val offset = UInt(pageOffsetLen.W)
   }
 
   def vaBundle3 = new Bundle {
     val vpn    = UInt(vpnLen.W)
-    val offset = UInt(offsetLen.W)
+    val offset = UInt(pageOffsetLen.W)
   }
 
   def vpnBundle = new Bundle {
@@ -59,12 +55,12 @@ trait Sv39Const extends CoreParameter {
     val ppn2   = UInt(ppn2Len.W)
     val ppn1   = UInt(ppn1Len.W)
     val ppn0   = UInt(ppn0Len.W)
-    val offset = UInt(offsetLen.W)
+    val offset = UInt(pageOffsetLen.W)
   }
 
   def paBundle2 = new Bundle {
     val ppn    = UInt(ppnLen.W)
-    val offset = UInt(offsetLen.W)
+    val offset = UInt(pageOffsetLen.W)
   }
 
   def paddrApply(ppn: UInt, vpnn: UInt): UInt = {
@@ -106,7 +102,7 @@ trait Sv39Const extends CoreParameter {
   }
 
   def maskPaddr(ppn: UInt, vaddr: UInt, mask: UInt) = {
-    MaskData(vaddr, Cat(ppn, 0.U(offsetLen.W)), Cat(Fill(ppn2Len, 1.U(1.W)), mask, 0.U(offsetLen.W)))
+    MaskData(vaddr, Cat(ppn, 0.U(pageOffsetLen.W)), Cat(Fill(ppn2Len, 1.U(1.W)), mask, 0.U(pageOffsetLen.W)))
   }
 
   def MaskEQ(mask: UInt, pattern: UInt, vpn: UInt) = {
@@ -120,7 +116,7 @@ trait HasTlbConst extends Sv39Const {
 
   val maskLen  = vpn0Len + vpn1Len // 18
   val metaLen  = vpnLen + asidLen + maskLen + flagLen // 27 + 16 + 18 + 8 = 69, is asid necessary
-  val dataLen  = ppnLen + PAddrBits //
+  val dataLen  = ppnLen + PAddrBits // 20 + 32 = 52
   val tlbLen   = metaLen + dataLen
   val nway     = tlbConfig.nway
   val nindex   = tlbConfig.nindex
@@ -130,7 +126,7 @@ trait HasTlbConst extends Sv39Const {
   def vaddrTlbBundle = new Bundle {
     val tag   = UInt(tagWid.W)
     val index = UInt(indexWid.W)
-    val off   = UInt(offsetLen.W)
+    val off   = UInt(pageOffsetLen.W)
   }
 
   def metaBundle = new Bundle {
diff --git a/chisel/playground/src/pipeline/decoder/ARegfile.scala b/chisel/playground/src/pipeline/decode/ARegfile.scala
similarity index 98%
rename from chisel/playground/src/pipeline/decoder/ARegfile.scala
rename to chisel/playground/src/pipeline/decode/ARegfile.scala
index fb7b950..27c24a5 100644
--- a/chisel/playground/src/pipeline/decoder/ARegfile.scala
+++ b/chisel/playground/src/pipeline/decode/ARegfile.scala
@@ -1,4 +1,4 @@
-package cpu.pipeline.decoder
+package cpu.pipeline.decode
 
 import chisel3._
 import chisel3.util._
diff --git a/chisel/playground/src/pipeline/decoder/DecoderUnit.scala b/chisel/playground/src/pipeline/decode/DecodeUnit.scala
similarity index 93%
rename from chisel/playground/src/pipeline/decoder/DecoderUnit.scala
rename to chisel/playground/src/pipeline/decode/DecodeUnit.scala
index 437789b..476dfa0 100644
--- a/chisel/playground/src/pipeline/decoder/DecoderUnit.scala
+++ b/chisel/playground/src/pipeline/decode/DecodeUnit.scala
@@ -1,4 +1,4 @@
-package cpu.pipeline.decoder
+package cpu.pipeline.decode
 
 import chisel3._
 import chisel3.util._
@@ -6,11 +6,11 @@ import chisel3.util.experimental.BoringUtils
 import cpu.defines._
 import cpu.defines.Const._
 import cpu.{BranchPredictorConfig, CpuConfig}
-import cpu.pipeline.execute.DecoderUnitExecuteUnit
+import cpu.pipeline.execute.DecodeUnitExecuteUnit
 import cpu.pipeline.fetch.BufferUnit
 import cpu.pipeline.execute
 
-class InstFifoDecoderUnit(implicit val cpuConfig: CpuConfig) extends Bundle {
+class InstFifoDecodeUnit(implicit val cpuConfig: CpuConfig) extends Bundle {
   val allow_to_go = Output(Vec(cpuConfig.decoderNum, Bool()))
   val inst        = Input(Vec(cpuConfig.decoderNum, new BufferUnit()))
   val info = Input(new Bundle {
@@ -19,7 +19,7 @@ class InstFifoDecoderUnit(implicit val cpuConfig: CpuConfig) extends Bundle {
   })
 }
 
-class DataForwardToDecoderUnit extends Bundle {
+class DataForwardToDecodeUnit extends Bundle {
   val exe      = new RegWrite()
   val mem_wreg = Bool()
   val mem      = new RegWrite()
@@ -37,21 +37,21 @@ class DecoderBranchPredictorUnit extends Bundle {
   val update_pht_index = Input(UInt(bpuConfig.phtDepth.W))
 }
 
-class DecoderUnit(implicit val cpuConfig: CpuConfig) extends Module with HasExceptionNO with HasCSRConst {
+class DecodeUnit(implicit val cpuConfig: CpuConfig) extends Module with HasExceptionNO with HasCSRConst {
   val io = IO(new Bundle {
     // 输入
-    val instFifo = new InstFifoDecoderUnit()
+    val instFifo = new InstFifoDecodeUnit()
     val regfile  = Vec(cpuConfig.decoderNum, new Src12Read())
-    val forward  = Input(Vec(cpuConfig.commitNum, new DataForwardToDecoderUnit()))
-    val csr      = Input(new execute.CsrDecoderUnit())
+    val forward  = Input(Vec(cpuConfig.commitNum, new DataForwardToDecodeUnit()))
+    val csr      = Input(new execute.CsrDecodeUnit())
     // 输出
     val fetchUnit = new Bundle {
       val branch = Output(Bool())
       val target = Output(UInt(XLEN.W))
     }
     val bpu          = new DecoderBranchPredictorUnit()
-    val executeStage = Output(new DecoderUnitExecuteUnit())
-    val ctrl         = new DecoderUnitCtrl()
+    val executeStage = Output(new DecodeUnitExecuteUnit())
+    val ctrl         = new DecodeUnitCtrl()
   })
 
   val decoder     = Seq.fill(cpuConfig.decoderNum)(Module(new Decoder()))
diff --git a/chisel/playground/src/pipeline/decoder/Decoder.scala b/chisel/playground/src/pipeline/decode/Decoder.scala
similarity index 98%
rename from chisel/playground/src/pipeline/decoder/Decoder.scala
rename to chisel/playground/src/pipeline/decode/Decoder.scala
index 683c904..915c7d6 100644
--- a/chisel/playground/src/pipeline/decoder/Decoder.scala
+++ b/chisel/playground/src/pipeline/decode/Decoder.scala
@@ -1,4 +1,4 @@
-package cpu.pipeline.decoder
+package cpu.pipeline.decode
 
 import chisel3._
 import chisel3.util._
diff --git a/chisel/playground/src/pipeline/decoder/ForwardCtrl.scala b/chisel/playground/src/pipeline/decode/ForwardCtrl.scala
similarity index 98%
rename from chisel/playground/src/pipeline/decoder/ForwardCtrl.scala
rename to chisel/playground/src/pipeline/decode/ForwardCtrl.scala
index 6bacdbd..9ef1a66 100644
--- a/chisel/playground/src/pipeline/decoder/ForwardCtrl.scala
+++ b/chisel/playground/src/pipeline/decode/ForwardCtrl.scala
@@ -1,4 +1,4 @@
-package cpu.pipeline.decoder
+package cpu.pipeline.decode
 
 import chisel3._
 import chisel3.util._
@@ -10,7 +10,7 @@ import cpu.CpuConfig
 class ForwardCtrl(implicit val cpuConfig: CpuConfig) extends Module {
   val io = IO(new Bundle {
     val in = Input(new Bundle {
-      val forward = Vec(cpuConfig.commitNum, new DataForwardToDecoderUnit())
+      val forward = Vec(cpuConfig.commitNum, new DataForwardToDecodeUnit())
       val regfile = Vec(cpuConfig.decoderNum, new Src12Read())
     })
     val out = Output(new Bundle {
diff --git a/chisel/playground/src/pipeline/decoder/Issue.scala b/chisel/playground/src/pipeline/decode/Issue.scala
similarity index 99%
rename from chisel/playground/src/pipeline/decoder/Issue.scala
rename to chisel/playground/src/pipeline/decode/Issue.scala
index 50bbea7..0c2718e 100644
--- a/chisel/playground/src/pipeline/decoder/Issue.scala
+++ b/chisel/playground/src/pipeline/decode/Issue.scala
@@ -1,4 +1,4 @@
-package cpu.pipeline.decoder
+package cpu.pipeline.decode
 
 import chisel3._
 import chisel3.util._
diff --git a/chisel/playground/src/pipeline/decoder/JumpCtrl.scala b/chisel/playground/src/pipeline/decode/JumpCtrl.scala
similarity index 97%
rename from chisel/playground/src/pipeline/decoder/JumpCtrl.scala
rename to chisel/playground/src/pipeline/decode/JumpCtrl.scala
index ca99b52..c1570a6 100644
--- a/chisel/playground/src/pipeline/decoder/JumpCtrl.scala
+++ b/chisel/playground/src/pipeline/decode/JumpCtrl.scala
@@ -1,4 +1,4 @@
-package cpu.pipeline.decoder
+package cpu.pipeline.decode
 
 import chisel3._
 import chisel3.util._
@@ -13,7 +13,7 @@ class JumpCtrl(implicit val cpuConfig: CpuConfig) extends Module {
       val pc       = UInt(XLEN.W)
       val info     = new InstInfo()
       val src_info = new SrcInfo()
-      val forward  = Vec(cpuConfig.commitNum, new DataForwardToDecoderUnit())
+      val forward  = Vec(cpuConfig.commitNum, new DataForwardToDecodeUnit())
     })
     val out = Output(new Bundle {
       val jump_register = Bool()
diff --git a/chisel/playground/src/pipeline/execute/ExecuteStage.scala b/chisel/playground/src/pipeline/execute/ExecuteStage.scala
index bd826c2..9b948a6 100644
--- a/chisel/playground/src/pipeline/execute/ExecuteStage.scala
+++ b/chisel/playground/src/pipeline/execute/ExecuteStage.scala
@@ -7,11 +7,11 @@ import cpu.defines.Const._
 import cpu.{BranchPredictorConfig, CpuConfig}
 
 class IdExeInst0 extends Bundle {
-  val cpuConfig   = new BranchPredictorConfig()
-  val pc       = UInt(XLEN.W)
-  val info     = new InstInfo()
-  val src_info = new SrcInfo()
-  val ex       = new ExceptionInfo()
+  val cpuConfig = new BranchPredictorConfig()
+  val pc        = UInt(XLEN.W)
+  val info      = new InstInfo()
+  val src_info  = new SrcInfo()
+  val ex        = new ExceptionInfo()
   val jb_info = new Bundle {
     // jump ctrl
     val jump_regiser = Bool()
@@ -24,13 +24,13 @@ class IdExeInst0 extends Bundle {
 }
 
 class IdExeInst1 extends Bundle {
-  val pc          = UInt(XLEN.W)
-  val info        = new InstInfo()
-  val src_info    = new SrcInfo()
-  val ex          = new ExceptionInfo()
+  val pc       = UInt(XLEN.W)
+  val info     = new InstInfo()
+  val src_info = new SrcInfo()
+  val ex       = new ExceptionInfo()
 }
 
-class DecoderUnitExecuteUnit extends Bundle {
+class DecodeUnitExecuteUnit extends Bundle {
   val inst0 = new IdExeInst0()
   val inst1 = new IdExeInst1()
 }
@@ -38,11 +38,11 @@ class DecoderUnitExecuteUnit extends Bundle {
 class ExecuteStage(implicit val cpuConfig: CpuConfig) extends Module {
   val io = IO(new Bundle {
     val ctrl = Input(new Bundle {
-      val allow_to_go = Vec(cpuConfig.decoderNum,Bool())
-      val clear             = Vec(cpuConfig.decoderNum, Bool())
+      val allow_to_go = Vec(cpuConfig.decoderNum, Bool())
+      val clear       = Vec(cpuConfig.decoderNum, Bool())
     })
-    val decoderUnit = Input(new DecoderUnitExecuteUnit())
-    val executeUnit = Output(new DecoderUnitExecuteUnit())
+    val decodeUnit  = Input(new DecodeUnitExecuteUnit())
+    val executeUnit = Output(new DecodeUnitExecuteUnit())
   })
 
   val inst0 = RegInit(0.U.asTypeOf(new IdExeInst0()))
@@ -51,13 +51,13 @@ class ExecuteStage(implicit val cpuConfig: CpuConfig) extends Module {
   when(io.ctrl.clear(0)) {
     inst0 := 0.U.asTypeOf(new IdExeInst0())
   }.elsewhen(io.ctrl.allow_to_go(0)) {
-    inst0 := io.decoderUnit.inst0
+    inst0 := io.decodeUnit.inst0
   }
 
   when(io.ctrl.clear(1)) {
     inst1 := 0.U.asTypeOf(new IdExeInst1())
   }.elsewhen(io.ctrl.allow_to_go(1)) {
-    inst1 := io.decoderUnit.inst1
+    inst1 := io.decodeUnit.inst1
   }
 
   io.executeUnit.inst0 := inst0
diff --git a/chisel/playground/src/pipeline/execute/ExecuteUnit.scala b/chisel/playground/src/pipeline/execute/ExecuteUnit.scala
index db5db7a..1a71984 100644
--- a/chisel/playground/src/pipeline/execute/ExecuteUnit.scala
+++ b/chisel/playground/src/pipeline/execute/ExecuteUnit.scala
@@ -5,21 +5,21 @@ import chisel3.util._
 import cpu.CpuConfig
 import cpu.defines._
 import cpu.defines.Const._
-import cpu.pipeline.decoder.RegWrite
+import cpu.pipeline.decode.RegWrite
 import cpu.pipeline.memory.ExecuteUnitMemoryUnit
 import cpu.pipeline.fetch.ExecuteUnitBranchPredictor
 
 class ExecuteUnit(implicit val cpuConfig: CpuConfig) extends Module {
   val io = IO(new Bundle {
     val ctrl         = new ExecuteCtrl()
-    val executeStage = Input(new DecoderUnitExecuteUnit())
+    val executeStage = Input(new DecodeUnitExecuteUnit())
     val csr          = Flipped(new CsrExecuteUnit())
     val bpu          = new ExecuteUnitBranchPredictor()
     val fetchUnit = Output(new Bundle {
       val flush  = Bool()
       val target = UInt(XLEN.W)
     })
-    val decoderUnit = new Bundle {
+    val decodeUnit = new Bundle {
       val forward = Output(
         Vec(
           cpuConfig.commitNum,
@@ -177,13 +177,13 @@ class ExecuteUnit(implicit val cpuConfig: CpuConfig) extends Module {
     io.memoryStage.inst1.ex.tval := io.fetchUnit.target
   }
 
-  io.decoderUnit.forward(0).exe.wen      := io.memoryStage.inst0.info.reg_wen
-  io.decoderUnit.forward(0).exe.waddr    := io.memoryStage.inst0.info.reg_waddr
-  io.decoderUnit.forward(0).exe.wdata    := io.memoryStage.inst0.rd_info.wdata(io.memoryStage.inst0.info.fusel)
-  io.decoderUnit.forward(0).exe_mem_wreg := io.ctrl.inst(0).mem_wreg
+  io.decodeUnit.forward(0).exe.wen      := io.memoryStage.inst0.info.reg_wen
+  io.decodeUnit.forward(0).exe.waddr    := io.memoryStage.inst0.info.reg_waddr
+  io.decodeUnit.forward(0).exe.wdata    := io.memoryStage.inst0.rd_info.wdata(io.memoryStage.inst0.info.fusel)
+  io.decodeUnit.forward(0).exe_mem_wreg := io.ctrl.inst(0).mem_wreg
 
-  io.decoderUnit.forward(1).exe.wen      := io.memoryStage.inst1.info.reg_wen
-  io.decoderUnit.forward(1).exe.waddr    := io.memoryStage.inst1.info.reg_waddr
-  io.decoderUnit.forward(1).exe.wdata    := io.memoryStage.inst1.rd_info.wdata(io.memoryStage.inst1.info.fusel)
-  io.decoderUnit.forward(1).exe_mem_wreg := io.ctrl.inst(1).mem_wreg
+  io.decodeUnit.forward(1).exe.wen      := io.memoryStage.inst1.info.reg_wen
+  io.decodeUnit.forward(1).exe.waddr    := io.memoryStage.inst1.info.reg_waddr
+  io.decodeUnit.forward(1).exe.wdata    := io.memoryStage.inst1.rd_info.wdata(io.memoryStage.inst1.info.fusel)
+  io.decodeUnit.forward(1).exe_mem_wreg := io.ctrl.inst(1).mem_wreg
 }
diff --git a/chisel/playground/src/pipeline/execute/fu/Csr.scala b/chisel/playground/src/pipeline/execute/fu/Csr.scala
index fc4286c..62a67dc 100644
--- a/chisel/playground/src/pipeline/execute/fu/Csr.scala
+++ b/chisel/playground/src/pipeline/execute/fu/Csr.scala
@@ -42,7 +42,7 @@ class CsrExecuteUnit(implicit val cpuConfig: CpuConfig) extends Bundle {
   })
 }
 
-class CsrDecoderUnit extends Bundle {
+class CsrDecodeUnit extends Bundle {
   val mode      = Output(Priv())
   val interrupt = Output(UInt(INT_WID.W))
 }
@@ -55,7 +55,7 @@ class CsrTlb extends Bundle {
 class Csr(implicit val cpuConfig: CpuConfig) extends Module with HasCSRConst {
   val io = IO(new Bundle {
     val ext_int     = Input(new ExtInterrupt())
-    val decoderUnit = new CsrDecoderUnit()
+    val decodeUnit  = new CsrDecodeUnit()
     val executeUnit = new CsrExecuteUnit()
     val memoryUnit  = new CsrMemoryUnit()
     val tlb         = new CsrTlb()
@@ -253,7 +253,7 @@ class Csr(implicit val cpuConfig: CpuConfig) extends Module with HasCSRConst {
 
   val interrupt_enable = Wire(Vec(INT_WID, Bool()))
   interrupt_enable.zip(ideleg.asBools).map { case (x, y) => x := priviledgedEnableDetect(y) }
-  io.decoderUnit.interrupt := mie(INT_WID - 1, 0) & mip_has_interrupt.asUInt & interrupt_enable.asUInt
+  io.decodeUnit.interrupt := mie(INT_WID - 1, 0) & mip_has_interrupt.asUInt & interrupt_enable.asUInt
 
   // 优先使用inst0的信息
   val mem_pc        = io.memoryUnit.in.pc
@@ -415,7 +415,7 @@ class Csr(implicit val cpuConfig: CpuConfig) extends Module with HasCSRConst {
 
   io.tlb.mode           := mode
   io.tlb.satp           := satp
-  io.decoderUnit.mode   := mode
+  io.decodeUnit.mode    := mode
   io.executeUnit.out.ex := io.executeUnit.in.ex
   io.executeUnit.out.ex.exception(illegalInstr) :=
     (illegal_addr || illegal_access) && write | io.executeUnit.in.ex.exception(illegalInstr)
diff --git a/chisel/playground/src/pipeline/fetch/BranchPredictorUnit.scala b/chisel/playground/src/pipeline/fetch/BranchPredictorUnit.scala
index f066d25..e019e85 100644
--- a/chisel/playground/src/pipeline/fetch/BranchPredictorUnit.scala
+++ b/chisel/playground/src/pipeline/fetch/BranchPredictorUnit.scala
@@ -4,12 +4,13 @@ import chisel3._
 import chisel3.util._
 import cpu.defines.Const._
 import cpu._
-import cpu.pipeline.decoder.Src12Read
+import cpu.pipeline.decode.Src12Read
 import cpu.defines.BRUOpType
 import cpu.defines.FuOpType
 import cpu.defines.FuType
 import cpu.defines.SignedExtend
-import cpu.pipeline.decoder.DecoderBranchPredictorUnit
+import cpu.pipeline.decode.DecoderBranchPredictorUnit
+import pipeline.decode.{DecoderBranchPredictorUnit, Src12Read}
 
 class ExecuteUnitBranchPredictor extends Bundle {
   val bpuConfig        = new BranchPredictorConfig()
@@ -21,7 +22,7 @@ class ExecuteUnitBranchPredictor extends Bundle {
 
 class BranchPredictorIO(implicit cpuConfig: CpuConfig) extends Bundle {
   val bpuConfig = new BranchPredictorConfig()
-  val decoder   = Flipped(new DecoderBranchPredictorUnit())
+  val decode    = Flipped(new DecoderBranchPredictorUnit())
 
   val instBuffer = new Bundle {
     val pc        = Input(Vec(cpuConfig.instFetchNum, UInt(XLEN.W)))
@@ -58,20 +59,20 @@ class GlobalBranchPredictor(
 
   val strongly_not_taken :: weakly_not_taken :: weakly_taken :: strongly_taken :: Nil = Enum(4)
 
-  val imm = io.decoder.info.imm
+  val imm = io.decode.info.imm
 
-  io.decoder.branch_inst := io.decoder.info.valid &&
-    FuType.bru === io.decoder.info.fusel && BRUOpType.isBranch(io.decoder.info.op)
-  io.decoder.target := io.decoder.pc + imm
+  io.decode.branch_inst := io.decode.info.valid &&
+    FuType.bru === io.decode.info.fusel && BRUOpType.isBranch(io.decode.info.op)
+  io.decode.target := io.decode.pc + imm
   // 局部预测模式
 
   val bht       = RegInit(VecInit(Seq.fill(1 << BHT_DEPTH)(0.U(PHT_DEPTH.W))))
   val pht       = RegInit(VecInit(Seq.fill(1 << PHT_DEPTH)(strongly_taken)))
-  val bht_index = io.decoder.pc(1 + BHT_DEPTH, 2)
+  val bht_index = io.decode.pc(1 + BHT_DEPTH, 2)
   val pht_index = bht(bht_index)
 
-  io.decoder.branch :=
-    io.decoder.branch_inst && (pht(pht_index) === weakly_taken || pht(pht_index) === strongly_taken)
+  io.decode.branch :=
+    io.decode.branch_inst && (pht(pht_index) === weakly_taken || pht(pht_index) === strongly_taken)
   val update_bht_index = io.execute.pc(1 + BHT_DEPTH, 2)
   val update_pht_index = bht(update_bht_index)
 
@@ -107,23 +108,23 @@ class AdaptiveTwoLevelPredictor(
 
   val strongly_not_taken :: weakly_not_taken :: weakly_taken :: strongly_taken :: Nil = Enum(4)
 
-  val imm = io.decoder.info.imm
+  val imm = io.decode.info.imm
 
-  io.decoder.branch_inst := io.decoder.info.valid &&
-    FuType.bru === io.decoder.info.fusel && BRUOpType.isBranch(io.decoder.info.op)
-  io.decoder.target := io.decoder.pc + imm
+  io.decode.branch_inst := io.decode.info.valid &&
+    FuType.bru === io.decode.info.fusel && BRUOpType.isBranch(io.decode.info.op)
+  io.decode.target := io.decode.pc + imm
 
   val bht       = RegInit(VecInit(Seq.fill(1 << BHT_DEPTH)(0.U(PHT_DEPTH.W))))
   val pht       = RegInit(VecInit(Seq.fill(1 << PHT_DEPTH)(strongly_taken)))
-  val pht_index = io.decoder.pht_index
+  val pht_index = io.decode.pht_index
 
   for (i <- 0 until cpuConfig.instFetchNum) {
     io.instBuffer.pht_index(i) := bht(io.instBuffer.pc(i)(1 + BHT_DEPTH, 2))
   }
 
-  io.decoder.branch :=
-    io.decoder.branch_inst && (pht(pht_index) === weakly_taken || pht(pht_index) === strongly_taken)
-  io.decoder.update_pht_index := bht(io.decoder.pc(1 + BHT_DEPTH, 2))
+  io.decode.branch :=
+    io.decode.branch_inst && (pht(pht_index) === weakly_taken || pht(pht_index) === strongly_taken)
+  io.decode.update_pht_index := bht(io.decode.pc(1 + BHT_DEPTH, 2))
 
   val update_bht_index = io.execute.pc(1 + BHT_DEPTH, 2)
   val update_pht_index = io.execute.update_pht_index
diff --git a/chisel/playground/src/pipeline/fetch/FetchUnit.scala b/chisel/playground/src/pipeline/fetch/FetchUnit.scala
index 415634d..857bdf1 100644
--- a/chisel/playground/src/pipeline/fetch/FetchUnit.scala
+++ b/chisel/playground/src/pipeline/fetch/FetchUnit.scala
@@ -14,7 +14,7 @@ class FetchUnit(
       val flush  = Input(Bool())
       val target = Input(UInt(XLEN.W))
     }
-    val decoder = new Bundle {
+    val decode = new Bundle {
       val branch = Input(Bool())
       val target = Input(UInt(XLEN.W))
     }
@@ -49,10 +49,10 @@ class FetchUnit(
   io.iCache.pc_next := MuxCase(
     pc_next_temp,
     Seq(
-      io.memory.flush   -> io.memory.target,
-      io.execute.flush  -> io.execute.target,
-      io.decoder.branch -> io.decoder.target,
-      io.instFifo.full  -> pc
+      io.memory.flush  -> io.memory.target,
+      io.execute.flush -> io.execute.target,
+      io.decode.branch -> io.decode.target,
+      io.instFifo.full -> pc
     )
   )
 }
diff --git a/chisel/playground/src/pipeline/memory/MemoryUnit.scala b/chisel/playground/src/pipeline/memory/MemoryUnit.scala
index 4fa805e..9e1890f 100644
--- a/chisel/playground/src/pipeline/memory/MemoryUnit.scala
+++ b/chisel/playground/src/pipeline/memory/MemoryUnit.scala
@@ -5,7 +5,7 @@ import chisel3.util._
 import cpu.defines._
 import cpu.defines.Const._
 import cpu.CpuConfig
-import cpu.pipeline.decoder.RegWrite
+import cpu.pipeline.decode.RegWrite
 import cpu.pipeline.execute.CsrMemoryUnit
 import cpu.pipeline.writeback.MemoryUnitWriteBackUnit
 
@@ -17,7 +17,7 @@ class MemoryUnit(implicit val cpuConfig: CpuConfig) extends Module {
       val flush  = Bool()
       val target = UInt(XLEN.W)
     })
-    val decoderUnit    = Output(Vec(cpuConfig.commitNum, new RegWrite()))
+    val decodeUnit    = Output(Vec(cpuConfig.commitNum, new RegWrite()))
     val csr            = Flipped(new CsrMemoryUnit())
     val writeBackStage = Output(new MemoryUnitWriteBackUnit())
     val dataMemory     = new Lsu_DataMemory()
@@ -93,12 +93,12 @@ class MemoryUnit(implicit val cpuConfig: CpuConfig) extends Module {
   lsu.memoryUnit.in.lr      := io.csr.out.lr
   lsu.memoryUnit.in.lr_addr := io.csr.out.lr_addr
 
-  io.decoderUnit(0).wen   := io.writeBackStage.inst0.info.reg_wen
-  io.decoderUnit(0).waddr := io.writeBackStage.inst0.info.reg_waddr
-  io.decoderUnit(0).wdata := io.writeBackStage.inst0.rd_info.wdata(io.writeBackStage.inst0.info.fusel)
-  io.decoderUnit(1).wen   := io.writeBackStage.inst1.info.reg_wen
-  io.decoderUnit(1).waddr := io.writeBackStage.inst1.info.reg_waddr
-  io.decoderUnit(1).wdata := io.writeBackStage.inst1.rd_info.wdata(io.writeBackStage.inst1.info.fusel)
+  io.decodeUnit(0).wen   := io.writeBackStage.inst0.info.reg_wen
+  io.decodeUnit(0).waddr := io.writeBackStage.inst0.info.reg_waddr
+  io.decodeUnit(0).wdata := io.writeBackStage.inst0.rd_info.wdata(io.writeBackStage.inst0.info.fusel)
+  io.decodeUnit(1).wen   := io.writeBackStage.inst1.info.reg_wen
+  io.decodeUnit(1).waddr := io.writeBackStage.inst1.info.reg_waddr
+  io.decodeUnit(1).wdata := io.writeBackStage.inst1.rd_info.wdata(io.writeBackStage.inst1.info.fusel)
 
   io.writeBackStage.inst0.pc                        := io.memoryStage.inst0.pc
   io.writeBackStage.inst0.info                      := io.memoryStage.inst0.info
diff --git a/chisel/playground/src/pipeline/writeback/WriteBackUnit.scala b/chisel/playground/src/pipeline/writeback/WriteBackUnit.scala
index 1f72ec2..cb9c73b 100644
--- a/chisel/playground/src/pipeline/writeback/WriteBackUnit.scala
+++ b/chisel/playground/src/pipeline/writeback/WriteBackUnit.scala
@@ -4,7 +4,7 @@ import chisel3._
 import chisel3.util._
 import cpu.defines._
 import cpu.defines.Const._
-import cpu.pipeline.decoder.RegWrite
+import cpu.pipeline.decode.RegWrite
 import cpu.CpuConfig
 
 class WriteBackUnit(implicit val cpuConfig: CpuConfig) extends Module {