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diff --git a/src/VeriFuzz/Simulator/Xst.hs b/src/VeriFuzz/Simulator/Xst.hs
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+{-|
+Module      : VeriFuzz.Simulator.Xst
+Description : Xst (ise) simulator implementation.
+Copyright   : (c) 2018-2019, Yann Herklotz Grave
+License     : BSD-3
+Maintainer  : ymherklotz [at] gmail [dot] com
+Stability   : experimental
+Portability : POSIX
+
+Xst (ise) simulator implementation.
+-}
+
+{-# LANGUAGE QuasiQuotes #-}
+
+module VeriFuzz.Simulator.Xst where
+
+import           Control.Lens               hiding ((<.>))
+import           Data.Text                  (Text)
+import qualified Data.Text                  as T
+import           Prelude                    hiding (FilePath)
+import           Shelly
+import           Text.Shakespeare.Text      (st)
+import           VeriFuzz.Simulator.General
+import           VeriFuzz.Verilog.AST
+import           VeriFuzz.Verilog.CodeGen
+
+data Xst = Xst { xstPath    :: FilePath
+               , netgenPath :: FilePath
+               }
+
+instance Simulator Xst where
+  toText _ = "xst"
+
+instance Synthesize Xst where
+  runSynth = runSynthXst
+
+defaultXst :: Xst
+defaultXst = Xst "/opt/Xilinx/14.7/ISE_DS/ISE/bin/lin64/xst" "/opt/Xilinx/14.7/ISE_DS/ISE/bin/lin64/netgen"
+
+runSynthXst :: Xst -> ModDecl -> FilePath -> Sh ()
+runSynthXst sim mod outf = do
+  writefile xstFile [st|run
+-ifn #{modName}.prj -ofn #{modName} -p artix7 -top #{modName}
+-iobuf NO -ram_extract NO -rom_extract NO -use_dsp48 NO
+-fsm_extract YES -fsm_encoding Auto
+-change_error_to_warning "HDLCompiler:226 HDLCompiler:1832"
+|]
+  writefile prjFile [st|verilog work "rtl.v"|]
+  writefile "rtl.v" $ genSource mod
+  timeout_ (xstPath sim) ["-ifn", toTextIgnore xstFile]
+  run_ (netgenPath sim) ["-w", "-ofmt", "verilog", toTextIgnore $ modFile <.> "ngc", toTextIgnore outf]
+  run_ "sed" ["-i", "/^`ifndef/,/^`endif/ d; s/ *Timestamp: .*//;", toTextIgnore outf]
+  where
+    modName = mod ^. moduleId . getIdentifier
+    modFile = fromText modName
+    xstFile = modFile <.> "xst"
+    prjFile = modFile <.> "prj"
+    vFile = modFile <.> "v"