diff --git a/fuzzers/029-bram-fifo-config/Makefile b/fuzzers/029-bram-fifo-config/Makefile
index b4482201..e3bf802a 100644
--- a/fuzzers/029-bram-fifo-config/Makefile
+++ b/fuzzers/029-bram-fifo-config/Makefile
@@ -10,8 +10,7 @@ build/segbits_bramx.rdb: $(SPECIMENS_OK)
 build/segbits_bramx.db: build/segbits_bramx.rdb
 	${XRAY_DBFIXUP} --db-root build --zero-db bits.dbf \
 		--seg-fn-in build/segbits_bramx.rdb \
-		--seg-fn-out build/segbits_bramx.unmerged.db
-	python3 merge_in_use.py build/segbits_bramx.unmerged.db > build/segbits_bramx.db
+		--seg-fn-out build/segbits_bramx.db
 	${XRAY_MASKMERGE} build/mask_bramx.db $(addsuffix /segdata_bram_[lr].txt,$(SPECIMENS))
 
 pushdb:
diff --git a/fuzzers/029-bram-fifo-config/bits.dbf b/fuzzers/029-bram-fifo-config/bits.dbf
index 4f5f5aba..e69de29b 100644
--- a/fuzzers/029-bram-fifo-config/bits.dbf
+++ b/fuzzers/029-bram-fifo-config/bits.dbf
@@ -1,2 +0,0 @@
-27_150,BRAM.RAMB18_Y0.RAM_IN_USE
-27_169,BRAM.RAMB18_Y1.RAM_IN_USE
diff --git a/fuzzers/029-bram-fifo-config/generate.py b/fuzzers/029-bram-fifo-config/generate.py
index 502cdaf4..d61205f1 100644
--- a/fuzzers/029-bram-fifo-config/generate.py
+++ b/fuzzers/029-bram-fifo-config/generate.py
@@ -27,10 +27,8 @@ def main():
         for param, tag in (
                 ('Y0_IN_USE', 'RAMB18_Y0.IN_USE'),
                 ('Y1_IN_USE', 'RAMB18_Y1.IN_USE'),
-                ('RAMB_Y0_IN_USE', 'RAMB18_Y0.RAM_IN_USE'),
-                ('RAMB_Y1_IN_USE', 'RAMB18_Y1.RAM_IN_USE'),
-                ('FIFO_Y0_IN_USE', 'RAMB18_Y0.FIFO_IN_USE'),
-                ('FIFO_Y1_IN_USE', 'RAMB18_Y1.FIFO_IN_USE'),
+                ('FIFO_Y0_IN_USE', 'RAMB18_Y0.FIFO_MODE'),
+                ('FIFO_Y1_IN_USE', 'RAMB18_Y1.FIFO_MODE'),
                 ):
             segmk.add_tile_tag(tile_param['tile'], tag, tile_param[param])
 
diff --git a/fuzzers/029-bram-fifo-config/merge_in_use.py b/fuzzers/029-bram-fifo-config/merge_in_use.py
deleted file mode 100644
index 4a8b05b5..00000000
--- a/fuzzers/029-bram-fifo-config/merge_in_use.py
+++ /dev/null
@@ -1,63 +0,0 @@
-""" Merge IN_USE entries. 
-
-Segmatch has trouble directly solving for RAM_IN_USE and FIFO_IN_USE.
-Instead if solves for IN_USE (e.g. RAM_IN_USE or FIFO_IN_USE) and the FIFO_IN_USE bit.
-
-This tool merges the 3 entries into 2 entries RAM_IN_USE and FIFO_IN_USE.
-
-
-BRAM.RAMB18_Y0.FIFO_IN_USE 27_150
-BRAM.RAMB18_Y0.IN_USE 27_100 27_99
-BRAM.RAMB18_Y0.RAM_IN_USE !27_150
-
-becomes
-
-BRAM.RAMB18_Y0.FIFO_IN_USE 27_100 27_99 27_150
-BRAM.RAMB18_Y0.RAM_IN_USE 27_100 27_99 !27_150
-
-"""
-import argparse
-
-def main():
-    parser = argparse.ArgumentParser(description=__doc__)
-
-    parser.add_argument('unmerged_db')
-
-    args = parser.parse_args()
-
-    site_parts = {}
-
-    with open(args.unmerged_db) as f:
-        for l in f:
-            parts = l.strip().split(' ')
-
-            feature = parts[0]
-            bits = parts[1:]
-
-            feature_parts = feature.split('.')
-
-            assert feature_parts[0] == 'BRAM'
-            assert feature_parts[1] in ('RAMB18_Y0', 'RAMB18_Y1')
-            site = feature_parts[1]
-
-            if site not in site_parts:
-                site_parts[site] = {}
-
-            site_parts[site][feature_parts[2]] = bits
-
-    assert len(site_parts) == 2
-    for site in site_parts:
-        assert 'IN_USE' in site_parts[site]
-        assert len(site_parts[site]) == 3
-
-        for feature in site_parts[site]:
-            if feature == 'IN_USE':
-                continue
-
-            print('BRAM.{site}.{feature} {bits}'.format(
-                site=site,
-                feature=feature,
-                bits=' '.join(site_parts[site]['IN_USE'] + site_parts[site][feature])))
-
-if __name__ == "__main__":
-    main()
diff --git a/fuzzers/029-bram-fifo-config/top.py b/fuzzers/029-bram-fifo-config/top.py
index f7c6b797..e620a32c 100644
--- a/fuzzers/029-bram-fifo-config/top.py
+++ b/fuzzers/029-bram-fifo-config/top.py
@@ -32,8 +32,6 @@ def ramb18(tile_name, luts, lines, sites):
     params['tile'] = tile_name
     params['Y0_IN_USE'] = random.randint(0, 1) == 1
     params['Y1_IN_USE'] = not params['Y0_IN_USE']
-    params['RAMB_Y0_IN_USE'] = params['Y0_IN_USE']
-    params['RAMB_Y1_IN_USE'] = params['Y1_IN_USE']
     params['FIFO_Y0_IN_USE'] = False
     params['FIFO_Y1_IN_USE'] = False
 
@@ -62,8 +60,6 @@ def ramb18_2x(tile_name, luts, lines, sites):
     params['tile'] = tile_name
     params['Y0_IN_USE'] = True
     params['Y1_IN_USE'] = True
-    params['RAMB_Y0_IN_USE'] = True
-    params['RAMB_Y1_IN_USE'] = True
     params['FIFO_Y0_IN_USE'] = False
     params['FIFO_Y1_IN_USE'] = False
 
@@ -91,8 +87,6 @@ def ramb36(tile_name, luts, lines, sites):
     params['tile'] = tile_name
     params['Y0_IN_USE'] = True
     params['Y1_IN_USE'] = True
-    params['RAMB_Y0_IN_USE'] = True
-    params['RAMB_Y1_IN_USE'] = True
     params['FIFO_Y0_IN_USE'] = False
     params['FIFO_Y1_IN_USE'] = False
 
@@ -182,8 +176,6 @@ def fifo18(tile_name, luts, lines, sites):
     params['tile'] = tile_name
     params['Y0_IN_USE'] = True
     params['Y1_IN_USE'] = False
-    params['RAMB_Y0_IN_USE'] = False
-    params['RAMB_Y1_IN_USE'] = False
     params['FIFO_Y0_IN_USE'] = True
     params['FIFO_Y1_IN_USE'] = False
 
@@ -218,8 +210,6 @@ def fifo18_ramb18(tile_name, luts, lines, sites):
     params['tile'] = tile_name
     params['Y0_IN_USE'] = True
     params['Y1_IN_USE'] = True
-    params['RAMB_Y0_IN_USE'] = False
-    params['RAMB_Y1_IN_USE'] = True
     params['FIFO_Y0_IN_USE'] = True
     params['FIFO_Y1_IN_USE'] = False
 
@@ -257,8 +247,6 @@ def fifo36(tile_name, luts, lines, sites):
     params['tile'] = tile_name
     params['Y0_IN_USE'] = True
     params['Y1_IN_USE'] = True
-    params['RAMB_Y0_IN_USE'] = False
-    params['RAMB_Y1_IN_USE'] = False
     params['FIFO_Y0_IN_USE'] = True
     params['FIFO_Y1_IN_USE'] = True