diff --git a/.gitignore b/.gitignore
index 2e70a80..fe30a83 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,5 +4,4 @@ sim/run/run.log
 sim/run/vsim.wlf
 sim/run/work/*
 sim/run/wlf*
-refer_rtl/sm3_rtl_v2/*
-refer_rtl/sm3_rtl_v2
+
diff --git a/refer_rtl/sm3_rtl_v2 b/refer_rtl/sm3_rtl_v2
deleted file mode 160000
index 61856db..0000000
--- a/refer_rtl/sm3_rtl_v2
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 61856db6612150f5373f832e36d7bec6fce4accd