diff --git a/Makefile b/Makefile
index 11e58b5..d80f37b 100644
--- a/Makefile
+++ b/Makefile
@@ -5,9 +5,9 @@ VERILATOR_CFLAGS += -MMD -Wall --build -cc -Wno-lint \
 # include path
 INC_PATH ?= 
 
-# files of emu
+# files of the RTL project
 TOPNAME ?= top
-DIR ?= $(NVBOARD_HOME)/emu
+DIR ?= $(NVBOARD_HOME)/example
 OBJ_DIR = $(DIR)/obj_dir
 
 # generated executable file
@@ -48,4 +48,4 @@ run: $(DST_BIN) cons
 clean:
 	rm -rf $(OBJ_DIR)
 
-.PHONY: clean run cons
\ No newline at end of file
+.PHONY: clean run cons
diff --git a/README.md b/README.md
index c62852c..f875b42 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ NVBoard(NJU Virtual Board)是基于SDL开发的虚拟FPGA开发板，可以在Ve
 .
 ├── board                   开发板配置文件
 │   └── ...
-├── emu                     演示项目目录
+├── example                 示例项目
 │   └── ...
 ├── include
 │   ├── at_scancode.h
@@ -44,7 +44,7 @@ NVBoard(NJU Virtual Board)是基于SDL开发的虚拟FPGA开发板，可以在Ve
 
 ## 示例
 
-本项目下的emu是一个演示项目，在该目录下通过 `make run` 命令可运行该项目。
+`example`目录下包含一个示例项目，在该目录下通过 `make run` 命令可运行该项目。
 
 ## 使用说明
 
diff --git a/emu/src/README.md b/emu/src/README.md
deleted file mode 100644
index e79a411..0000000
--- a/emu/src/README.md
+++ /dev/null
@@ -1,2 +0,0 @@
-# 注意
-emu添加了新的图像rom文件，直接在$NVBOARD_HOME运行 `make run` 会找不到该文件，因此需要cd到emu文件夹下
diff --git a/emu/src/clkgen.v b/emu/src/clkgen.v
deleted file mode 100644
index f00005c..0000000
--- a/emu/src/clkgen.v
+++ /dev/null
@@ -1,30 +0,0 @@
-module clkgen (
-    input clkin,
-    input rst,
-    input clken,
-    output reg clkout
-);
-    
-    parameter clk_freq = 1000;
-    parameter countlimit = 50000000/2/clk_freq;
-
-    reg [31:0] clkcount;
-    always @(posedge clkin) begin
-        if(rst)begin
-            clkcount <= 0;
-            clkout <= 1'b0;
-        end
-        else begin
-            if(clken)begin
-                if(clkcount + 1 == countlimit)begin
-                    clkcount <= 32'd0;
-                    clkout <= ~clkout;
-                end
-                else begin
-                    clkcount <= clkcount + 1;
-                end
-            end
-        end
-    end
-
-endmodule
diff --git a/emu/.gitignore b/example/.gitignore
similarity index 100%
rename from emu/.gitignore
rename to example/.gitignore
diff --git a/emu/Makefile b/example/Makefile
similarity index 100%
rename from emu/Makefile
rename to example/Makefile
diff --git a/example/src/README.md b/example/src/README.md
new file mode 100644
index 0000000..ae1c4eb
--- /dev/null
+++ b/example/src/README.md
@@ -0,0 +1,2 @@
+# 注意
+添加了新的图像rom文件，直接在$NVBOARD_HOME运行 `make run` 会找不到该文件，因此需要cd到emu文件夹下
diff --git a/emu/src/main.cpp b/example/src/main.cpp
similarity index 100%
rename from emu/src/main.cpp
rename to example/src/main.cpp
diff --git a/emu/src/picture.hex b/example/src/picture.hex
similarity index 100%
rename from emu/src/picture.hex
rename to example/src/picture.hex
diff --git a/emu/src/ps2_keyboard.v b/example/src/ps2_keyboard.v
similarity index 100%
rename from emu/src/ps2_keyboard.v
rename to example/src/ps2_keyboard.v
diff --git a/emu/src/seg.v b/example/src/seg.v
similarity index 100%
rename from emu/src/seg.v
rename to example/src/seg.v
diff --git a/emu/src/test.v b/example/src/test.v
similarity index 100%
rename from emu/src/test.v
rename to example/src/test.v
diff --git a/emu/src/top.cons b/example/src/top.cons
similarity index 100%
rename from emu/src/top.cons
rename to example/src/top.cons
diff --git a/emu/src/top.v b/example/src/top.v
similarity index 100%
rename from emu/src/top.v
rename to example/src/top.v
diff --git a/emu/src/vga_ctrl.v b/example/src/vga_ctrl.v
similarity index 100%
rename from emu/src/vga_ctrl.v
rename to example/src/vga_ctrl.v