added new gbe design

diff --git a/gbe_trb b/gbe_trb
new file mode 160000 (submodule)
index 0000000..a4565aa
--- /dev/null
+++ b/gbe_trb
@@ -0,0 +1 @@
+Subproject commit a4565aa930ad8c78a6a897efd91da7a026180b87