diff --git a/fuzzers/030-iob/generate.py b/fuzzers/030-iob/generate.py
index 19c8576f..82ecd66b 100644
--- a/fuzzers/030-iob/generate.py
+++ b/fuzzers/030-iob/generate.py
@@ -85,6 +85,13 @@ def main():
                 site, '_'.join(STEPDOWN_IOSTANDARDS) + '.STEPDOWN',
                 iostandard in STEPDOWN_IOSTANDARDS)
 
+            if 'IN_TERM' in d:
+                segmaker.add_site_group_zero(
+                    segmk, site, 'IN_TERM.', [
+                        'NONE', 'UNTUNED_SPLIT_40', 'UNTUNED_SPLIT_50',
+                        'UNTUNED_SPLIT_60'
+                    ], 'NONE', d['IN_TERM'])
+
             if d['type'] is None:
                 segmk.add_site_tag(site, 'INOUT', 0)
                 segmk.add_site_tag(site, '{}.IN_USE'.format(iostandard), 0)
diff --git a/fuzzers/030-iob/generate.tcl b/fuzzers/030-iob/generate.tcl
index f0776206..7d1c18d5 100644
--- a/fuzzers/030-iob/generate.tcl
+++ b/fuzzers/030-iob/generate.tcl
@@ -44,6 +44,7 @@ proc loc_pins {} {
         set drive [lindex $line 4]
         set slew [lindex $line 5]
         set pulltype [lindex $line 6]
+        set in_term [lindex $line 7]
 
         # Have: site
         # Want: pin for site
@@ -69,6 +70,10 @@ proc loc_pins {} {
             lappend props SLEW $slew
         }
 
+        if {$in_term != "None"} {
+            lappend props IN_TERM $in_term
+        }
+
         puts $props
 
         set_property -dict "$props" $port
diff --git a/fuzzers/030-iob/top.py b/fuzzers/030-iob/top.py
index b622fc78..e7c59238 100644
--- a/fuzzers/030-iob/top.py
+++ b/fuzzers/030-iob/top.py
@@ -62,6 +62,19 @@ def run():
         "SSTL135": ["DIFF_SSTL135"],
     }
 
+    IN_TERM_ALLOWED = [
+        'SSTL15',
+        'SSTL15_R',
+        'SSTL18',
+        'SSTL18_R',
+        'SSTL135',
+        'SSTL135_R',
+        'HSTL_I'
+        'HSTL_I_18'
+        'HSTL_II',
+        'HSTL_II_18',
+    ]
+
     iostandard = random.choice(iostandards)
 
     if iostandard in ['LVTTL', 'LVCMOS18']:
@@ -149,6 +162,15 @@ def run():
                 p['SLEW'] = None
                 p['IBUF_LOW_PWR'] = random.randint(0, 1)
 
+                if iostandard in IN_TERM_ALLOWED:
+                    p['IN_TERM'] = random.choice(
+                        (
+                            'NONE',
+                            'UNTUNED_SPLIT_40',
+                            'UNTUNED_SPLIT_50',
+                            'UNTUNED_SPLIT_60',
+                        ))
+
                 i_idx += 1
             elif p['type'] == 'IBUFDS':
                 p['pad_wire'] = 'di[{}]'.format(i_idx)
@@ -228,9 +250,15 @@ def run():
             if p['type'] is not None:
                 tile_params.append(
                     (
-                        tile, site, p['pad_wire'], iostandard_site, p['DRIVE'],
+                        tile,
+                        site,
+                        p['pad_wire'],
+                        iostandard_site,
+                        p['DRIVE'],
                         verilog.unquote(p['SLEW']) if p['SLEW'] else None,
-                        verilog.unquote(p['PULLTYPE'])))
+                        verilog.unquote(p['PULLTYPE']),
+                        p['IN_TERM'] if 'IN_TERM' in p else None,
+                    ))
             params['tiles'].append(p)
 
     write_params(tile_params)