diff --git a/firmware/firmware.map b/firmware/firmware.map
index 03ca7e4..703fb8e 100644
--- a/firmware/firmware.map
+++ b/firmware/firmware.map
@@ -6,31 +6,31 @@
 
 链结器命令稿和内存映射
 
-LOAD /tmp/ccljpktb.o
-LOAD /tmp/ccyHRNCG.o
+LOAD /tmp/ccAfohhF.o
+LOAD /tmp/ccqZrkCR.o
 
 .memory         0x0000000000000000      0x1b0
                 0x0000000000000000                . = 0x0
  *(.init)
- .init          0x0000000000000000       0x10 /tmp/ccljpktb.o
+ .init          0x0000000000000000       0x10 /tmp/ccAfohhF.o
  *(.text)
- .text          0x0000000000000010        0x0 /tmp/ccljpktb.o
- .text          0x0000000000000010       0x82 /tmp/ccyHRNCG.o
+ .text          0x0000000000000010        0x0 /tmp/ccAfohhF.o
+ .text          0x0000000000000010       0x82 /tmp/ccqZrkCR.o
                 0x0000000000000010                putc
                 0x0000000000000052                puts
                 0x0000000000000078                memcpy
  *(*)
- .data          0x0000000000000092        0x0 /tmp/ccljpktb.o
- .bss           0x0000000000000092        0x0 /tmp/ccljpktb.o
- .rela.init     0x0000000000000092        0x0 /tmp/ccljpktb.o
- .data          0x0000000000000092        0x0 /tmp/ccyHRNCG.o
- .bss           0x0000000000000092        0x0 /tmp/ccyHRNCG.o
- .text.startup  0x0000000000000092       0x88 /tmp/ccyHRNCG.o
+ .data          0x0000000000000092        0x0 /tmp/ccAfohhF.o
+ .bss           0x0000000000000092        0x0 /tmp/ccAfohhF.o
+ .rela.init     0x0000000000000092        0x0 /tmp/ccAfohhF.o
+ .data          0x0000000000000092        0x0 /tmp/ccqZrkCR.o
+ .bss           0x0000000000000092        0x0 /tmp/ccqZrkCR.o
+ .text.startup  0x0000000000000092       0x88 /tmp/ccqZrkCR.o
                 0x0000000000000092                main
  *fill*         0x000000000000011a        0x2 
  .rodata.str1.4
-                0x000000000000011c       0x80 /tmp/ccyHRNCG.o
- .comment       0x000000000000019c       0x11 /tmp/ccyHRNCG.o
+                0x000000000000011c       0x80 /tmp/ccqZrkCR.o
+ .comment       0x000000000000019c       0x11 /tmp/ccqZrkCR.o
                                          0x12 (松开之前的大小)
                 0x00000000000001b0                . = ALIGN (0x4)
  *fill*         0x00000000000001ad        0x3 
diff --git a/scripts/kamikaze_test/kamikaze_test.al b/scripts/kamikaze_test/kamikaze_test.al
index c616359..9faa104 100644
--- a/scripts/kamikaze_test/kamikaze_test.al
+++ b/scripts/kamikaze_test/kamikaze_test.al
@@ -18,7 +18,7 @@
         <CWC_FILE/>
     </Source_Files>
     <TOP_MODULE>
-        <LABEL/>
+        <LABEL></LABEL>
         <MODULE>top</MODULE>
         <CREATEINDEX>auto</CREATEINDEX>
     </TOP_MODULE>
@@ -26,6 +26,6 @@
         <Current_Step>0</Current_Step>
         <SRC-Last-Read/>
         <SLC-Last-Read/>
-        <SDC-Last-Read></SDC-Last-Read>
+        <SDC-Last-Read/>
     </Project_Settings>
 </Project>
diff --git a/src/csr.txt b/src/csr.txt
new file mode 100644
index 0000000..0177fc5
--- /dev/null
+++ b/src/csr.txt
@@ -0,0 +1,10 @@
+0x300	MSTATUS:	IE[0], PRIV[2:1], CY[3]
+0x341	MEPC		Storage last pc and jump to interrupt or exception address
+0x342	MCAUSE		INT[31](it is trigged by an interrupt), Exception op-code[4:0]
+0x301	MISA		ISA support RV32IMC
+
+0xF11	MVID		"ANLG"	(Anlogic)
+0xF12	MARCHID		"ZYKZ"	(Zhiyuan Kamikaze)
+0xF13	MIMPID		"0000"	(r0p0)
+
+/* performance counter will not be implemented in this CPU */
diff --git a/src/fetch.v b/src/fetch.v
index 9a2f6a4..0ac4e7c 100644
--- a/src/fetch.v
+++ b/src/fetch.v
@@ -14,7 +14,7 @@ module kamikaze_fetch(clk_i,
 	input [31:0] im_data_i; 
 	output reg [31:0] instr_o;
 	output [31:0] im_addr_o;
-	output reg instr_valid_o;
+	output instr_valid_o;
 	output is_compressed_instr_o;
 	output [31:0] pc_o;
 	//input stall_i; /* IF 停止信号 */
@@ -34,7 +34,10 @@ module kamikaze_fetch(clk_i,
 	
 	assign is_compressed_instr_o = is_compressed_instr;
 	
-	localparam CPU_START = 32'h0; /* 启动地址 */
+	reg align_wait;	/* 对齐等待 */
+	
+	assign instr_valid_o = !align_wait;
+	localparam CPU_START = 32'h2; /* 启动地址 */
 	
 	assign im_addr_o = pc_4[1]? (pc_4 + 2'b10): pc_4; /* 舍入 */
 	assign stall_requiring = (pc_add_prev == 2) && (pc[1:0] == 2'b00); /* 16位对齐等待，防止冲数据 */
@@ -42,29 +45,33 @@ module kamikaze_fetch(clk_i,
 	assign pc_o = pc;
 	
 	
+	
+	
 	always @(posedge clk_i or negedge rst_i)
 	begin
 		if(!rst_i)
 		begin
-			pc_4 <= CPU_START;
-			pc <= CPU_START;/* PC 比 pc_4 滞后1 CLK */
+			pc_4 <= {CPU_START[31:2], 2'b00};
+			pc <= {CPU_START[31:2], 2'b00};/* PC 比 pc_4 滞后1 CLK */
 			fetch_start <= 0;
 			pc_add_prev <= 4;
 			last_instr <= 32'h0;
-			instr_valid_o <= 0;
+			align_wait = CPU_START[1];
 		end
 		else
 		begin
 			if(!stall_i)
-			begin
+			begin	
 				if(fetch_start == 1'b0)
 				begin
 					fetch_start <= 1'b1; /* 取 0 指令 */
 					pc_4 <= pc_4 + 16'h4;
-					instr_valid_o <= 1;
 				end
 				else
 				begin
+					if(align_wait)
+						align_wait <= 0;
+						
 					pc_4 <= pc_4 + pc_add;
 					pc <= pc + pc_add;
 				
diff --git a/src/int_exp.txt b/src/int_exp.txt
new file mode 100644
index 0000000..4088ee2
--- /dev/null
+++ b/src/int_exp.txt
@@ -0,0 +1,11 @@
+interrupt & exception table:
+base_address: IVT_BASE, must be aligned to 4
+
+initial_sp
+reset_address
+bus_error(misaligned/invalid memory access)
+execute_error(divided by zero or illegal instruction)
+sys_call(ecall instruction, ebreak will triggers the debugger if it is online)
+nmi(not maskable interrupt, it is interrupt 0)
+interrupts 1-31
+
diff --git a/src/regfile.v b/src/regfile.v
new file mode 100644
index 0000000..e69de29
diff --git a/src/tb.v b/src/tb.v
index 48bca08..aaf8788 100644
--- a/src/tb.v
+++ b/src/tb.v
@@ -6,7 +6,6 @@ module system_tb;
 	initial begin
 		$dumpfile("kamikaze.vcd");
 		$dumpvars(0, system_tb);
-		#10 rst = 0;
 		#15 rst = 1;
 		#1000 $finish;