style(cache): 优化了下acc err写法

chisel/playground/src/cache/DCache.scala

@@ -65,17 +65,17 @@ class DCache(implicit config: CpuConfig) extends Module {
 
   val saved_rdata = RegInit(0.U(DATA_WID.W))
   val acc_err     = RegInit(false.B)
-  io.cpu.rdata   := saved_rdata
-  io.cpu.acc_err := acc_err
 
   val mmio_read_stall  = !io.cpu.wen.orR
   val mmio_write_stall = io.cpu.wen.orR && !io.axi.w.ready
   val cached_stall     = false.B
   io.cpu.dcache_stall := Mux(
-    status === s_idle,
+    status === s_idle && !acc_err,
     Mux(io.cpu.en, (cached_stall || mmio_read_stall || mmio_write_stall), io.cpu.fence_i),
     status =/= s_save
   )
+  io.cpu.rdata   := saved_rdata
+  io.cpu.acc_err := acc_err
 
   switch(status) {
     is(s_idle) {

chisel/playground/src/cache/ICache.scala

@@ -40,25 +40,26 @@ class ICache(implicit config: CpuConfig) extends Module {
   }))))
   io.axi.r.ready := true.B
 
-  val acc_err = RegInit(false.B)
+  val acc_err  = RegInit(false.B)
-  io.cpu.acc_err := acc_err
+  val addr_err = io.cpu.addr(read_next_addr)(63, 32).orR
+
   (0 until config.instFetchNum).foreach(i => {
-    io.cpu.inst(i)       := saved(i).inst
+    io.cpu.inst(i)       := Mux(status === s_idle && !acc_err, 0.U, saved(i).inst)
-    io.cpu.inst_valid(i) := saved(i).valid || acc_err
+    io.cpu.inst_valid(i) := Mux(status === s_idle && !acc_err, false.B, saved(i).valid) && io.cpu.req
   })
 
-  val addr_err = io.cpu.addr(read_next_addr)(63, 32).orR
+  io.cpu.addr_err     := addr_err
-  io.cpu.addr_err := addr_err
+  io.cpu.acc_err      := acc_err
-
+  io.cpu.icache_stall := Mux(status === s_idle && !acc_err, io.cpu.req, status =/= s_save)
-  io.cpu.icache_stall := Mux(status === s_idle, io.cpu.req, status =/= s_save)
 
   switch(status) {
     is(s_idle) {
       acc_err := false.B
       when(io.cpu.req) {
         when(addr_err) {
-          acc_err := true.B
+          acc_err        := true.B
-          status  := s_save
+          saved(0).valid := true.B
+          status         := s_save
         }.otherwise {
           araddr         := pc
           arvalid        := true.B