diff --git a/README.md b/README.md
index 51070a0..65f58d2 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
+For design and description, see <https://www.wolai.com/zymbox/qsUPoFaTyy88NWHKrjFKtW>
 # RISC-V Simulator Template
 
 A template which enables you to write verilog-like C++ code.
diff --git a/design.md b/design.md
deleted file mode 100644
index f652421..0000000
--- a/design.md
+++ /dev/null
@@ -1 +0,0 @@
-- step1: 完成一个RV32I interpreter（无需支持I-type的指令）
\ No newline at end of file
diff --git a/include/alu.h b/include/alu.h
index e69de29..bd1f341 100644
--- a/include/alu.h
+++ b/include/alu.h
@@ -0,0 +1,4 @@
+#pragma once
+#ifndef ALU_H
+#include "tools.h"
+#endif
\ No newline at end of file
diff --git a/include/bus.h b/include/bus.h
deleted file mode 100644
index e69de29..0000000
diff --git a/include/cpu.h b/include/cpu.h
index 91fd2b5..40b3645 100644
--- a/include/cpu.h
+++ b/include/cpu.h
@@ -14,10 +14,10 @@ private:
 	std::vector<std::unique_ptr<ModuleBase>> mod_owned;
 	std::vector<ModuleBase *> modules;
   bool reset_signal = false;
-  dark::Wire<1> halt_signal;
 
 public:
 	unsigned long long cycles = 0;
+  dark::Wire<9> halt_signal;
 
 private:
 	void sync_all() {
@@ -60,13 +60,18 @@ public:
   bool GetResetSignal(){
     return reset_signal;
   }
-	void run(unsigned long long max_cycles = 0, bool shuffle = false) {
+	uint8_t run(unsigned long long max_cycles = 0, bool shuffle = false) {
 		auto func = shuffle ? &CPU::run_once_shuffle : &CPU::run_once;
     reset_signal=true;
 		while (max_cycles == 0 || cycles < max_cycles) {
 			(this->*func)();
       reset_signal=false;
+      uint32_t halt_signal_value = max_size_t(halt_signal);
+      if(halt_signal_value &(1<<9)) {
+        return halt_signal_value&0xff;
+      }
     }
+    return 255;
 	}
 };
 
diff --git a/include/csu.h b/include/csu.h
index 6319e6b..4de7d96 100644
--- a/include/csu.h
+++ b/include/csu.h
@@ -1,24 +1,62 @@
 #pragma once
 #ifndef CSU_H
+#include <functional>
+#include <array>
 #include "tools.h"
 namespace ZYM {
 const int kROBSize = 32;
 const int kTotalRegister = 32;
 struct CentralScheduleUnit_Input {
   dark::Wire<1> reset;
+  // data from load store queue
+  dark::Wire<6> load_store_queue_emptyspace_receiver;
+  // data from reservation station
+  dark::Wire<6> reservestation_emptyspace_receiver;
+  // data from Memory Station
+  dark::Wire<2> completed_memins_type;
+  dark::Wire<5> completed_memins_ROB_index;
+  dark::Wire<32> completed_memins_read_data;
+  // data from alu
+  dark::Wire<5> completed_aluins_ROB_index;
+  dark::Wire<32> completed_aluins_result;
 };
 struct CentralScheduleUnit_Output {
   dark::Register<1> ready;
   dark::Register<1> force_clear_announcer;
+  dark::Register<9> halt_signal;  // The highest bit is the marker, and the rest is the exit code
+};
+struct ROBRecordType {
+  dark::Register<4> state;
+  dark::Register<32> instruction;
+  dark::Register<5> resulting_register_idx;
+  dark::Register<32> resulting_register_value;
+  dark::Register<1> resulting_PC_ready;
+  dark::Register<32> resulting_PC;
+  dark::Register<4> mem_request_type; // see memory.h
+  dark::Register<32> mem_request_addr;
+  dark::Register<32> mem_request_data;
 };
 struct CentralScheduleUnit_Private {
-  dark::Register<32> predicated_PC;
+  dark::Register<32> predicted_PC;
+  dark::Register<1> has_predicted_PC;  // jalr may force the CPU to stall
+  dark::Register<32> actual_PC;
+  std::array<ROBRecordType, kROBSize> ROB_records;
+  dark::Register<5> ROB_head;
+  dark::Register<5> ROB_tail;
+  dark::Register<6> ROB_size;
 };
 struct CentralScheduleUnit
     : public dark::Module<CentralScheduleUnit_Input, CentralScheduleUnit_Output, CentralScheduleUnit_Private> {
  private:
  public:
   CentralScheduleUnit() { ; }
+  void work() override final {
+    if (bool(reset)) {
+      predicted_PC <= 0;
+      actual_PC <= 0;
+      has_predicted_PC <= 1;
+    }
+  }
 };
 }  // namespace ZYM
 #endif
\ No newline at end of file
diff --git a/include/loadstorequeue.h b/include/loadstorequeue.h
index e69de29..9d171ad 100644
--- a/include/loadstorequeue.h
+++ b/include/loadstorequeue.h
@@ -0,0 +1,4 @@
+#pragma once
+#ifndef LOADSTOREQUEUE_H
+#include "tools.h"
+#endif
\ No newline at end of file
diff --git a/include/memory.h b/include/memory.h
index f37ac50..adb5ac1 100644
--- a/include/memory.h
+++ b/include/memory.h
@@ -39,7 +39,7 @@ struct Memory : dark::Module<Memory_Input, Memory_Output, Memory_Private> {
       ready <= 1;
       return;
     }
-    if(bool(force_clear_signal)) {
+    if(bool(force_clear_receiver)) {
       status <= 0;
       ready <= 1;
       return;
diff --git a/include/reservestation.h b/include/reservestation.h
index e69de29..ca521dc 100644
--- a/include/reservestation.h
+++ b/include/reservestation.h
@@ -0,0 +1,4 @@
+#pragma once
+#ifndef RESERVATIONSTATION_H
+#include "tools.h"
+#endif
\ No newline at end of file
diff --git a/include/tools.h b/include/tools.h
index bf4a42f..71c58f2 100644
--- a/include/tools.h
+++ b/include/tools.h
@@ -7,8 +7,7 @@
 #include "wire.h"
 #include "module.h"
 #include "cpu.h"
-#include "memory.h"
-#include "bus.h"
+
 
 using dark::Bit;
 using dark::sign_extend;
diff --git a/src/main.cpp b/src/main.cpp
index 9bbf183..4318f03 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,10 +1,20 @@
-#include "tools.h"
+#include <iostream>
+#include "alu.h"
 #include "csu.h"
+#include "loadstorequeue.h"
+#include "memory.h"
+#include "registerfile.h"
+#include "reservestation.h"
+#include "tools.h"
 int main(int argc, char **argv) {
   dark::CPU cpu;
+  ZYM::CentralScheduleUnit csu;
   ZYM::Memory memory;
+  cpu.add_module(&csu);
   cpu.add_module(&memory);
+  cpu.halt_signal.assign([&]() -> auto & { return csu.halt_signal; });
   memory.reset = [&]() { return cpu.GetResetSignal(); };
   memory.LoadProgram(std::cin);
+  std::cout << cpu.run(0, true) << std::endl;
   return 0;
 }
\ No newline at end of file