diff --git a/fuzzers/001-part-yaml/Makefile b/fuzzers/001-part-yaml/Makefile
index 34aa6e75..70b92fe7 100644
--- a/fuzzers/001-part-yaml/Makefile
+++ b/fuzzers/001-part-yaml/Makefile
@@ -6,6 +6,7 @@ database: $(SPECIMENS)
 	cp build/specimen_001/part.yaml build/part.yaml
 	python3 -m utils.xyaml build/part.yaml > build/part_no_iobanks.json
 	python3 add_iobanks.py --part_json build/part_no_iobanks.json --iobanks_info build/specimen_001/iobanks.txt > build/part.json
+	cp ${XRAY_PART}_required_features.fasm build/ 2>/dev/null || true
 
 $(SPECIMENS): Makefile.specimen
 	mkdir -p $@
@@ -14,6 +15,7 @@ $(SPECIMENS): Makefile.specimen
 pushdb:
 	cp build/part.yaml ${XRAY_DATABASE_DIR}/$(XRAY_DATABASE)/${XRAY_PART}.yaml
 	cp build/part.json ${XRAY_DATABASE_DIR}/$(XRAY_DATABASE)/${XRAY_PART}.json
+	cp build/${XRAY_PART}_required_features.fasm ${XRAY_DATABASE_DIR}/$(XRAY_DATABASE)/${XRAY_PART}_required_features.fasm 2>/dev/null || true
 
 run:
 	$(MAKE) clean
diff --git a/fuzzers/001-part-yaml/xc7z010clg400-1_required_features.fasm b/fuzzers/001-part-yaml/xc7z010clg400-1_required_features.fasm
new file mode 100644
index 00000000..f1cfc1d6
--- /dev/null
+++ b/fuzzers/001-part-yaml/xc7z010clg400-1_required_features.fasm
@@ -0,0 +1,4 @@
+CFG_CENTER_MID_X67Y32.ALWAYS_ON_PROP1
+CFG_CENTER_MID_X67Y32.ALWAYS_ON_PROP2
+CFG_CENTER_MID_X67Y32.ALWAYS_ON_PROP3
+
diff --git a/fuzzers/001-part-yaml/xc7z020clg400-1_required_features.fasm b/fuzzers/001-part-yaml/xc7z020clg400-1_required_features.fasm
new file mode 100644
index 00000000..a8b5d226
--- /dev/null
+++ b/fuzzers/001-part-yaml/xc7z020clg400-1_required_features.fasm
@@ -0,0 +1,3 @@
+CFG_CENTER_MID_X123Y84.ALWAYS_ON_PROP1
+CFG_CENTER_MID_X123Y84.ALWAYS_ON_PROP2
+CFG_CENTER_MID_X123Y84.ALWAYS_ON_PROP3
diff --git a/prjxray/db.py b/prjxray/db.py
index d0fa2f3a..bdc85fc3 100644
--- a/prjxray/db.py
+++ b/prjxray/db.py
@@ -42,6 +42,8 @@ class Database(object):
         self.tile_segbits = {}
         self.site_types = {}
 
+        self.required_features = {}
+
         for f in os.listdir(self.db_root):
             if f.endswith('.json') and f.startswith('tile_type_'):
                 tile_type = f[len('tile_type_'):-len('.json')].lower()
@@ -85,6 +87,18 @@ class Database(object):
 
                 self.site_types[site_type_name] = os.path.join(self.db_root, f)
 
+            if f.endswith('_required_features.fasm'):
+                part = f[:-len('_required_features.fasm')]
+
+                with open(os.path.join(self.db_root, f), "r") as fp:
+                    features = []
+                    for line in fp:
+                        line = line.strip()
+                        if len(line) > 0:
+                            features.append(line)
+
+                    self.required_features[part] = set(features)
+
         self.tile_types_obj = {}
 
     def get_tile_types(self):
@@ -147,3 +161,16 @@ class Database(object):
                 self.tile_types[tile_type.upper()])
 
         return self.tile_segbits[tile_type]
+
+    def get_required_fasm_features(self, part=None):
+        """
+        Assembles a set of required fasm features for given part. Returns a list
+        of fasm features.
+        """
+
+        # No required features in the db, return empty list
+        if self.required_features is None:
+            return set()
+
+        # Return list of part specific features
+        return self.required_features.get(part, set())
diff --git a/utils/fasm2frames.py b/utils/fasm2frames.py
index 5551527e..1efd2a4e 100755
--- a/utils/fasm2frames.py
+++ b/utils/fasm2frames.py
@@ -81,6 +81,7 @@ def find_pudc_b(db):
 
 def run(
         db_root,
+        part,
         filename_in,
         f_out,
         sparse=False,
@@ -120,6 +121,10 @@ def run(
             extra_features = fasm.parse_fasm_string(
                 '\n'.join(roi_j['required_features']))
 
+    # Get required extra features for the part
+    required_features = db.get_required_fasm_features(part)
+    extra_features += fasm.parse_fasm_string('\n'.join(required_features))
+
     assembler.parse_fasm_filename(filename_in, extra_features=extra_features)
 
     if emit_pudc_b_pullup and not pudc_b_in_use and pudc_b_tile_site is not None:
@@ -165,7 +170,19 @@ def main():
         db_root_kwargs['required'] = False
         db_root_kwargs['default'] = os.path.join(database_dir, database)
 
+    db_part = os.getenv("XRAY_PART")
+    db_part_kwargs = {}
+    if db_part is None:
+        db_part_kwargs['required'] = True
+    else:
+        db_part_kwargs['required'] = False
+        db_part_kwargs['default'] = db_part
+
     parser.add_argument('--db-root', help="Database root.", **db_root_kwargs)
+    parser.add_argument(
+        '--part',
+        help="Part name. When not given defaults to XRAY_PART env. var.",
+        **db_part_kwargs)
     parser.add_argument(
         '--sparse', action='store_true', help="Don't zero fill all frames")
     parser.add_argument(
@@ -187,6 +204,7 @@ def main():
     args = parser.parse_args()
     run(
         db_root=args.db_root,
+        part=args.part,
         filename_in=args.fn_in,
         f_out=open(args.fn_out, 'w'),
         sparse=args.sparse,
diff --git a/utils/test_fasm2frames.py b/utils/test_fasm2frames.py
index b95631b2..69c32a44 100755
--- a/utils/test_fasm2frames.py
+++ b/utils/test_fasm2frames.py
@@ -70,7 +70,7 @@ class TestStringMethods(unittest.TestCase):
 
             fout = StringIO()
             fasm2frames.run(
-                self.filename_test_data('db'), fin.name, fout, **kw)
+                self.filename_test_data('db'), None, fin.name, fout, **kw)
 
             return fout.getvalue()