diff --git a/lib_xua/README.md b/lib_xua/README.md
new file mode 100644
index 00000000..8f9fab40
--- /dev/null
+++ b/lib_xua/README.md
@@ -0,0 +1,9 @@
+# lib_xua
+
+- 版本：3.5.1
+- 私有版本维护：Vergil Wong
+
+## 主要改动
+
+- 添加了`I2S_TDM_LRCLK_EDGES`，以适配AK4438VN的TDM时序，参考[修改时序以配置TDM](https://docs.pawpaw.cn/docs/applications/USB-Audio-Interface/Advanced-Guide/app-note/dac-timing-config/)
+- 添加了`AUDIO_UNSAFE_RESRC`，以将`unsafe`资源的赋值，合并到Audio线程中，以避免编译器检查（额外占用核心）
\ No newline at end of file
diff --git a/lib_xua/src/core/main.xc b/lib_xua/src/core/main.xc
index efa8ec29..17fdfca0 100755
--- a/lib_xua/src/core/main.xc
+++ b/lib_xua/src/core/main.xc
@@ -575,6 +575,10 @@ int main()
 
         on tile[AUDIO_IO_TILE]:
         {
+            #ifndef AUDIO_UNSAFE_RESRC
+            #define AUDIO_UNSAFE_RESRC
+            #endif
+            AUDIO_UNSAFE_RESRC
             /* Audio I/O task, includes mixing etc */
             usb_audio_io(c_mix_out
 #if (XUA_SPDIF_TX_EN) && (SPDIF_TX_TILE != AUDIO_IO_TILE)
diff --git a/lib_xua/src/core/ports/audioports.xc b/lib_xua/src/core/ports/audioports.xc
index fac58cbc..ca6d16da 100644
--- a/lib_xua/src/core/ports/audioports.xc
+++ b/lib_xua/src/core/ports/audioports.xc
@@ -73,6 +73,9 @@ void ConfigAudioPorts(
     if(!isnull(p_lrclk))
     {
         /* Clock LR clock from bit clock-block */
+        #if((XUA_PCM_FORMAT == XUA_PCM_FORMAT_TDM)&&(I2S_TDM_LRCLK_EDGES==0))
+        set_port_inv(p_lrclk);//反向lrclk的输出
+        #endif
         configure_out_port_no_ready(p_lrclk, clk_audio_bclk, 0);
     }