diff --git a/df_datalink_sp/src/systembus/systembus.c b/df_datalink_sp/src/systembus/systembus.c
index 3e25a09..829711b 100644
--- a/df_datalink_sp/src/systembus/systembus.c
+++ b/df_datalink_sp/src/systembus/systembus.c
@@ -562,18 +562,6 @@ int32_t SystemBus_HandleCmd(SYSBUS *instPtr)
 	return Status;
 }
 
-int32_t SystemBus_FLJ_PeriodUpdate(SYSBUS *instPtr)
-{
-	// TODO
-	return SUCCESS;
-}
-
-int32_t SystemBus_LJ_PeriodUpdate(SYSBUS *instPtr)
-{
-	// TODO
-	return SUCCESS;
-}
-
 /*****************************************************************************/
 /**
  * @brief   This function send a repose frame from system bus tx queue.
diff --git a/df_datalink_sp/src/systembus/systembus.h b/df_datalink_sp/src/systembus/systembus.h
index a901fce..0e895c1 100644
--- a/df_datalink_sp/src/systembus/systembus.h
+++ b/df_datalink_sp/src/systembus/systembus.h
@@ -48,9 +48,6 @@ int32_t SystemBus_Init(SYSBUS **instPtr, SYSBUS_CONFIG *config);
 
 int32_t SystemBus_HandleCmd(SYSBUS *instPtr);
 
-int32_t SystemBus_FLJ_PeriodUpdate(SYSBUS *instPtr);
-int32_t SystemBus_LJ_PeriodUpdate(SYSBUS *instPtr);
-
 int32_t SystemBus_MakeResp(SYSBUS *instPtr);
 
 int32_t SystemBus_TxIntrHandler(SYSBUS *instPtr);