diff --git a/mem/register_cluster/RegisterClusterRTL.py b/mem/register_cluster/RegisterClusterRTL.py
index ca0aa1f8..128ad085 100644
--- a/mem/register_cluster/RegisterClusterRTL.py
+++ b/mem/register_cluster/RegisterClusterRTL.py
@@ -90,7 +90,8 @@ def update_msgs_signals():
             (s.reg_bank[i].send_data.val & reg_towards_fu)
         s.reg_bank[i].send_data.rdy @= s.send_data_to_fu[i].rdy
 
-        s.recv_data_from_routing_crossbar[i].rdy @= s.send_data_to_fu[i].rdy
+        s.recv_data_from_routing_crossbar[i].rdy @= ((s.inport_opt.write_reg_from[i] == PORT_ROUTING_CROSSBAR) \
+                & (s.inport_opt.operation == OPT_NAH)) | s.send_data_to_fu[i].rdy
         s.recv_data_from_fu_crossbar[i].rdy @= 1
         s.recv_data_from_const[i].rdy @= 1