diff --git a/fuzzers/002-tilegrid/Makefile b/fuzzers/002-tilegrid/Makefile
index a093422..cc4ac6b 100644
--- a/fuzzers/002-tilegrid/Makefile
+++ b/fuzzers/002-tilegrid/Makefile
@@ -1,7 +1,8 @@
 FUZDIR=$(shell pwd)
 BUILD_DIR=$(FUZDIR)/build
 TILEGRID_TDB_DEPENDENCIES=
-TILEGRID_TDB_DEPENDENCIES += clb/build/segbits_tilegrid.tdb
+TILEGRID_TDB_DEPENDENCIES += clb/build/segbits_tilegrid.tdb \
+			     clb_int/build/segbits_tilegrid.tdb
 GENERATE_FULL_ARGS=
 
 database: build/tilegrid.json
diff --git a/fuzzers/002-tilegrid/add_tdb.py b/fuzzers/002-tilegrid/add_tdb.py
index 124db6c..6b7274a 100644
--- a/fuzzers/002-tilegrid/add_tdb.py
+++ b/fuzzers/002-tilegrid/add_tdb.py
@@ -77,6 +77,7 @@
     int_frames, int_words = localutil.get_int_params()
     tdb_fns = [
         ("clb/build/segbits_tilegrid.tdb", 36, 2),
+        ("clb_int/build/segbits_tilegrid.tdb", 60, 2),
     ]
 
     for (tdb_fn, frames, words) in tdb_fns:
diff --git a/fuzzers/002-tilegrid/clb_int/Makefile b/fuzzers/002-tilegrid/clb_int/Makefile
new file mode 100644
index 0000000..a55bb4b
--- /dev/null
+++ b/fuzzers/002-tilegrid/clb_int/Makefile
@@ -0,0 +1,4 @@
+N ?= 48
+GENERATE_ARGS?=--oneval 0 --design params.csv --dword 1 --dframe 3a
+include ../fuzzaddr/common.mk
+
diff --git a/fuzzers/002-tilegrid/clb_int/generate.tcl b/fuzzers/002-tilegrid/clb_int/generate.tcl
new file mode 100644
index 0000000..93c16fd
--- /dev/null
+++ b/fuzzers/002-tilegrid/clb_int/generate.tcl
@@ -0,0 +1,17 @@
+source "$::env(XRAY_DIR)/utils/utils.tcl"
+
+proc run {} {
+    create_project -force -part $::env(XRAY_PART) design design
+    read_verilog top.v
+    synth_design -top top
+
+    set_property BITSTREAM.GENERAL.PERFRAMECRC YES [current_design]
+
+    place_design
+    route_design
+
+    write_checkpoint -force design.dcp
+    write_bitstream -force design.bit
+}
+
+run
diff --git a/fuzzers/002-tilegrid/clb_int/top.py b/fuzzers/002-tilegrid/clb_int/top.py
new file mode 100644
index 0000000..250aebe
--- /dev/null
+++ b/fuzzers/002-tilegrid/clb_int/top.py
@@ -0,0 +1,81 @@
+import os
+import random
+random.seed(int(os.getenv("SEED"), 16))
+from utils import util
+from utils.db import Database
+
+
+def gen_sites():
+    db = Database(util.get_db_root())
+    grid = db.grid()
+    for tile_name in sorted(grid.tiles()):
+        loc = grid.loc_of_tilename(tile_name)
+        gridinfo = grid.gridinfo_at_loc(loc)
+        if gridinfo.tile_type in ['CLEL_L', 'CLEL_R', 'CLEM_L', 'CLEM_R']:
+            site_name = sorted(gridinfo.sites.keys())[0]
+            if gridinfo.tile_type[-1] == 'L':
+                int_tile_loc = (loc.grid_x + 1, loc.grid_y)
+            else:
+                int_tile_loc = (loc.grid_x - 1, loc.grid_y)
+
+            int_tile_name = grid.tilename_at_loc(int_tile_loc)
+
+            if not int_tile_name.startswith('INT_'):
+                continue
+
+            yield int_tile_name, site_name
+
+
+def write_params(params):
+    pinstr = 'tile,val\n'
+    for tile, (site, val) in sorted(params.items()):
+        pinstr += '%s,%s,%s\n' % (tile, val, site)
+    open('params.csv', 'w').write(pinstr)
+
+
+def run():
+    print('''
+module top();
+    ''')
+
+    params = {}
+
+    sites = sorted(list(gen_sites()))
+    for (tile_name, site_name), isone in zip(sites,
+                                             util.gen_fuzz_states(len(sites))):
+        params[tile_name] = (site_name, isone)
+
+        # Force HARD0 -> GFAN1 with I2 = 0
+        # Toggle 1 pip with I1 = ?
+        print(
+            '''
+            wire lut_to_f7_{0}, f7_to_f8_{0};
+            (* KEEP, DONT_TOUCH, LOC = "{0}" *)
+            LUT6_L #(
+            .INIT(0)
+            ) lut_rom_{0} (
+                    .I0(1),
+                    .I1({1}),
+                    .I2(0),
+                    .I3(1),
+                    .I4(1),
+                    .I5(1),
+                    .LO(lut_to_f7_{0})
+                    );
+            (* KEEP, DONT_TOUCH, LOC = "{0}" *)
+            MUXF7_L f7_{0} (
+                .I0(lut_to_f7_{0}),
+                .LO(f7_to_f8_{0})
+                );
+            (* KEEP, DONT_TOUCH, LOC = "{0}" *)
+            MUXF8 f8_{0} (
+                .I0(f7_to_f8_{0})
+                );
+'''.format(site_name, isone))
+
+    print("endmodule")
+    write_params(params)
+
+
+if __name__ == '__main__':
+    run()