diff --git a/src/paras.h b/src/paras.h
index b09fa00..e7919c7 100644
--- a/src/paras.h
+++ b/src/paras.h
@@ -11,7 +11,7 @@
     PARA( lut          , int    , '\0'  ,  false   , 8     , 0  , 30        , "max input numbers of LUT") \
     PARA( sp           , double , '\0'  ,  false   , 0.01  , 0  , 1         , "max input numbers of LUT") \
     PARA( brk_sp       , double , '\0'  ,  false   , 0.05  , 0  , 1         , "max input numbers of LUT") \
-    PARA( t            , int    , '\0'  ,  false   , 20    , 0  , 1000      , "max input numbers of LUT") \
+    PARA( t            , int    , '\0'  ,  false   , 30    , 0  , 1000      , "max input numbers of LUT") \
     PARA( vsat_inc     , int    , '\0'  ,  false   , 10    , 0  , 100000    , "max input numbers of LUT") \
     PARA( vsat_max     , int    , '\0'  ,  false   , 10000 , 0  , 100000    , "max input numbers of LUT") \
     PARA( fw_inc       , int    , '\0'  ,  false   , 1     , 0  , 1000      , "max input numbers of LUT") \