diff --git a/soc/runtime/dds.c b/soc/runtime/dds.c
index f148df869..ae9bcab57 100644
--- a/soc/runtime/dds.c
+++ b/soc/runtime/dds.c
@@ -2,6 +2,7 @@
 #include <hw/common.h>
 #include <stdio.h>
 
+#include "exceptions.h"
 #include "dds.h"
 
 #define DDS_FTW0  0x0a
@@ -42,6 +43,8 @@ static void fud(long long int fud_time)
     rtio_o_timestamp_write(fud_time+3*8);
     rtio_o_value_write(0);
     rtio_o_we_write(1);
+    if(rtio_o_error_read())
+        exception_raise(EID_RTIO_UNDERFLOW);
 
     if(r) {
         fud_sync();
diff --git a/soc/runtime/rtio.c b/soc/runtime/rtio.c
index 6f38b9419..d6cb77ba7 100644
--- a/soc/runtime/rtio.c
+++ b/soc/runtime/rtio.c
@@ -32,6 +32,8 @@ void rtio_replace(long long int timestamp, int channel, int value)
     rtio_o_timestamp_write(timestamp);
     rtio_o_value_write(value);
     rtio_o_replace_write(1);
+    if(rtio_o_error_read())
+        exception_raise(EID_RTIO_UNDERFLOW);
 }
 
 void rtio_sync(int channel)