diff --git a/utils/makesdf.py b/utils/makesdf.py
new file mode 100644
index 00000000..b89fc829
--- /dev/null
+++ b/utils/makesdf.py
@@ -0,0 +1,126 @@
+#!/usr/bin/env python3
+
+import json
+import argparse
+
+
+def get_elems_count(timings, slice, site, bel_type):
+    combinational = 0
+    sequential = 0
+    for delay in timings[slice][site][bel_type]:
+        if 'sequential' in timings[slice][site][bel_type][delay]:
+            sequential += 1
+        else:
+            combinational += 1
+    return combinational, sequential
+
+
+def produce_sdf(timings, outdir):
+
+    for slice in timings:
+        sdf = \
+"""
+(DELAYFILE
+    (SDFVERSION \"3.0\")
+    (TIMESCALE 1ps)
+"""
+        for site in timings[slice]:
+            for bel_type in timings[slice][site]:
+                combinational, sequential = get_elems_count(
+                    timings, slice, site, bel_type)
+                #define CELL
+                cell= \
+"""
+    (CELL
+        (CELLTYPE \"{name}\")
+        (INSTANCE {location})""".format(name=bel_type.upper(), location=site)
+                sdf += cell
+
+                #define delay header (if needed)
+                if combinational > 0:
+                    delay_hdr = \
+"""
+        (DELAY
+            (ABSOLUTE"""
+                    sdf += delay_hdr
+                    # add all delays definitions
+                    for delay in timings[slice][site][bel_type]:
+                        if 'sequential' in timings[slice][site][bel_type][
+                                delay]:
+                            continue
+                        dly = \
+"""
+                (IOPATH {input} {output} ({FAST_MIN}::{SLOW_MIN}) ({FAST_MAX}::{SLOW_MAX}))""".format(**timings[slice][site][bel_type][delay])
+                        if 'extra_ports' in timings[slice][site][bel_type][
+                                delay] is not None:
+                            dly += \
+""" #extra ports {}""".format(timings[slice][site][bel_type][delay]['extra_ports'])
+
+                        sdf += dly
+
+                    # close DELAY definition
+                    enddelay = \
+"""
+            )
+        )"""
+                    sdf += enddelay
+
+                # define TIMINGCHECK header (if needed)
+                if sequential > 0:
+                    timingcheck_hdr = \
+"""
+        (TIMINGCHECK"""
+                    sdf += timingcheck_hdr
+
+                    for delay in timings[slice][site][bel_type]:
+                        if 'sequential' not in timings[slice][site][bel_type][
+                                delay]:
+                            continue
+                        timingcheck = \
+"""
+            ({prop} {input} (posedge {clock}) ({FAST_MIN}::{SLOW_MIN}) ({FAST_MAX}::{SLOW_MAX}))""".format(
+                        prop=timings[slice][site][bel_type][delay]['sequential'].upper(),
+                        **timings[slice][site][bel_type][delay])
+
+                        if 'extra_ports' in timings[slice][site][bel_type][
+                                delay] is not None:
+                            timingcheck += \
+""" #extra ports {}""".format(timings[slice][site][bel_type][delay]['extra_ports'])
+
+                        sdf += timingcheck
+
+                    # close TIMINGCHECK definition
+                    endtimingcheck = \
+"""
+        )"""
+                    sdf += endtimingcheck
+
+                endcell = \
+"""
+    )"""
+                sdf += endcell
+            # end of SDF
+            sdf += \
+"""
+)"""
+
+        with open(outdir + '/' + slice + '.sdf', "w") as fp:
+            fp.write(sdf)
+
+
+def main():
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--json', type=str, help="Input JSON file")
+    parser.add_argument('--sdf', type=str, help="SDF files output directory")
+
+    args = parser.parse_args()
+
+    with open(args.json, 'r') as fp:
+        timings = json.load(fp)
+
+    produce_sdf(timings, args.sdf)
+
+
+if __name__ == '__main__':
+    main()