diff --git a/experiments/clbpips/generate.py b/experiments/clbpips/generate.py
index 1a625365..58824df8 100644
--- a/experiments/clbpips/generate.py
+++ b/experiments/clbpips/generate.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, re
-
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 print("Loading tags from design.txt.")
 with open("design.txt", "r") as f:
diff --git a/experiments/gndvcc/generate.py b/experiments/gndvcc/generate.py
index 3f814358..f0200544 100644
--- a/experiments/gndvcc/generate.py
+++ b/experiments/gndvcc/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, os, re
+import re
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 tiledata = dict()
 pipdata = dict()
diff --git a/experiments/pipsroute/generate.py b/experiments/pipsroute/generate.py
index aa131cae..c58c8298 100644
--- a/experiments/pipsroute/generate.py
+++ b/experiments/pipsroute/generate.py
@@ -3,13 +3,14 @@
 import sys, re
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
 pipdata = dict()
 ignpip = set()
 
 
 def handle_design(prefix, second_pass):
-    segmk = Segmaker(prefix + ".bits")
+    segmk = Segmaker(util.get_db_root(), prefix + ".bits")
 
     tiledata = dict()
     nlines = 0
diff --git a/fuzzers/010-lutinit/generate.py b/fuzzers/010-lutinit/generate.py
index bcf8c3ac..4e53630c 100644
--- a/fuzzers/010-lutinit/generate.py
+++ b/fuzzers/010-lutinit/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, re
+import sys
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design_%s.bits" % sys.argv[1])
+segmk = Segmaker(util.get_db_root(), "design_%s.bits" % sys.argv[1])
 
 print("Loading tags from design_%s.txt." % sys.argv[1])
 with open("design_%s.txt" % sys.argv[1], "r") as f:
diff --git a/fuzzers/011-ffconfig/generate.py b/fuzzers/011-ffconfig/generate.py
index b16edfca..169a6c1b 100644
--- a/fuzzers/011-ffconfig/generate.py
+++ b/fuzzers/011-ffconfig/generate.py
@@ -10,11 +10,10 @@ LDPE Primitive: Transparent Data Latch with Asynchronous Preset and Gate Enable
 
 from prims import *
 
-import sys, re
-
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 
 def ones(l):
diff --git a/fuzzers/011-ffconfig/top.py b/fuzzers/011-ffconfig/top.py
index 717f2bbf..3baec636 100644
--- a/fuzzers/011-ffconfig/top.py
+++ b/fuzzers/011-ffconfig/top.py
@@ -1,7 +1,5 @@
 import random
 random.seed(0)
-import os
-import re
 from prjxray import util
 
 from prims import *
@@ -14,8 +12,10 @@ f.write("i,prim,loc,bel,init\n")
 
 
 def gen_slices():
-    for _tile_name, site_name, _site_type in util.gen_sites(['SLICEL',
-                                                             'SLICEM']):
+    for _tile_name, site_name, _site_type in util.get_roi().gen_sites([
+        'SLICEL',
+        'SLICEM',
+        ]):
         yield site_name
 
 
diff --git a/fuzzers/012-clbn5ffmux/generate.py b/fuzzers/012-clbn5ffmux/generate.py
index b16cc19a..521e4d03 100644
--- a/fuzzers/012-clbn5ffmux/generate.py
+++ b/fuzzers/012-clbn5ffmux/generate.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, re
-
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 print("Loading tags")
 '''
diff --git a/fuzzers/012-clbn5ffmux/top.py b/fuzzers/012-clbn5ffmux/top.py
index 68013175..efb8079d 100644
--- a/fuzzers/012-clbn5ffmux/top.py
+++ b/fuzzers/012-clbn5ffmux/top.py
@@ -1,7 +1,5 @@
 import random
 random.seed(0)
-import os
-import re
 from prjxray import util
 
 CLBN = 40
@@ -9,8 +7,10 @@ print('//Requested CLBs: %s' % str(CLBN))
 
 
 def gen_slices():
-    for _tile_name, site_name, _site_type in util.gen_sites(['SLICEL',
-                                                             'SLICEM']):
+    for _tile_name, site_name, _site_type in util.get_roi().gen_sites([
+        'SLICEL',
+        'SLICEM'
+        ]):
         yield site_name
 
 
diff --git a/fuzzers/013-clbncy0/generate.py b/fuzzers/013-clbncy0/generate.py
index 8bb35c9a..333c4aa0 100644
--- a/fuzzers/013-clbncy0/generate.py
+++ b/fuzzers/013-clbncy0/generate.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, re
-
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 print("Loading tags")
 '''
diff --git a/fuzzers/013-clbncy0/top.py b/fuzzers/013-clbncy0/top.py
index 531372c1..af32d952 100644
--- a/fuzzers/013-clbncy0/top.py
+++ b/fuzzers/013-clbncy0/top.py
@@ -1,7 +1,5 @@
 import random
 random.seed(0)
-import os
-import re
 from prjxray import util
 
 CLBN = 400
@@ -9,8 +7,10 @@ print('//Requested CLBs: %s' % str(CLBN))
 
 
 def gen_slices():
-    for _tile_name, site_name, _site_type in util.gen_sites(['SLICEL',
-                                                             'SLICEM']):
+    for _tile_name, site_name, _site_type in util.get_roi().gen_sites([
+        'SLICEL',
+        'SLICEM'
+        ]):
         yield site_name
 
 
diff --git a/fuzzers/014-ffsrcemux/generate.py b/fuzzers/014-ffsrcemux/generate.py
index 2701b854..d3618ff8 100644
--- a/fuzzers/014-ffsrcemux/generate.py
+++ b/fuzzers/014-ffsrcemux/generate.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, re
-
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 print("Loading tags")
 '''
diff --git a/fuzzers/015-clbnffmux/generate.py b/fuzzers/015-clbnffmux/generate.py
index 2e69102d..f2d60d1d 100644
--- a/fuzzers/015-clbnffmux/generate.py
+++ b/fuzzers/015-clbnffmux/generate.py
@@ -1,11 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, os, re
-
 from prjxray.segmaker import Segmaker
 from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 cache = dict()
 
 print("Loading tags")
diff --git a/fuzzers/015-clbnffmux/top.py b/fuzzers/015-clbnffmux/top.py
index c3a21fda..052e6e24 100644
--- a/fuzzers/015-clbnffmux/top.py
+++ b/fuzzers/015-clbnffmux/top.py
@@ -1,7 +1,5 @@
 import random
 random.seed(0)
-import os
-import re
 from prjxray import util
 
 CLBN = 400
@@ -9,8 +7,10 @@ print('//Requested CLBs: %s' % str(CLBN))
 
 
 def gen_slices():
-    for _tile_name, site_name, _site_type in util.gen_sites(['SLICEL',
-                                                             'SLICEM']):
+    for _tile_name, site_name, _site_type in util.get_roi().gen_sites([
+        'SLICEL',
+        'SLICEM',
+        ]):
         yield site_name
 
 
diff --git a/fuzzers/016-clbnoutmux/generate.py b/fuzzers/016-clbnoutmux/generate.py
index 71af6b2b..d463f64b 100644
--- a/fuzzers/016-clbnoutmux/generate.py
+++ b/fuzzers/016-clbnoutmux/generate.py
@@ -1,11 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, os, re
-
 from prjxray.segmaker import Segmaker
 from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 cache = dict()
 
 print("Loading tags")
diff --git a/fuzzers/016-clbnoutmux/top.py b/fuzzers/016-clbnoutmux/top.py
index bb5bbbe4..72785a1c 100644
--- a/fuzzers/016-clbnoutmux/top.py
+++ b/fuzzers/016-clbnoutmux/top.py
@@ -1,7 +1,5 @@
 import random
 random.seed(0)
-import os
-import re
 from prjxray import util
 
 CLBN = 400
@@ -9,8 +7,10 @@ print('//Requested CLBs: %s' % str(CLBN))
 
 
 def gen_slices():
-    for _tile_name, site_name, _site_type in util.gen_sites(['SLICEL',
-                                                             'SLICEM']):
+    for _tile_name, site_name, _site_type in util.get_roi().gen_sites([
+        'SLICEL',
+        'SLICEM'
+        ]):
         yield site_name
 
 
diff --git a/fuzzers/017-clbprecyinit/generate.py b/fuzzers/017-clbprecyinit/generate.py
index 6e3f46ba..6035d675 100644
--- a/fuzzers/017-clbprecyinit/generate.py
+++ b/fuzzers/017-clbprecyinit/generate.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, os, re
-
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 print("Loading tags")
 f = open('params.csv', 'r')
diff --git a/fuzzers/018-clbram/generate.py b/fuzzers/018-clbram/generate.py
index ec46faa1..74e4154a 100644
--- a/fuzzers/018-clbram/generate.py
+++ b/fuzzers/018-clbram/generate.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, re, os
-
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 # Can fit 4 per CLB
 # BELable
diff --git a/fuzzers/018-clbram/top.py b/fuzzers/018-clbram/top.py
index 1de15ff2..b3c4fe30 100644
--- a/fuzzers/018-clbram/top.py
+++ b/fuzzers/018-clbram/top.py
@@ -17,8 +17,6 @@ Note: LUT6 was added to try to simplify reduction, although it might not be need
 
 import random
 random.seed(0)
-import os
-import re
 from prjxray import util
 
 CLBN = 50
@@ -26,7 +24,7 @@ print('//Requested CLBs: %s' % str(CLBN))
 
 
 def gen_slicems():
-    for _tile_name, site_name, _site_type in util.gen_sites(['SLICEM']):
+    for _tile_name, site_name, _site_type in util.get_roi().gen_sites(['SLICEM']):
         yield site_name
 
 
diff --git a/fuzzers/019-ndi1mux/generate.py b/fuzzers/019-ndi1mux/generate.py
index ece577a4..03317dd4 100644
--- a/fuzzers/019-ndi1mux/generate.py
+++ b/fuzzers/019-ndi1mux/generate.py
@@ -5,11 +5,10 @@
 # Can we find instance where they are not aliased?
 WA7USED = 0
 
-import sys, re, os
-
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 print("Loading tags")
 '''
diff --git a/fuzzers/019-ndi1mux/top.py b/fuzzers/019-ndi1mux/top.py
index fbb3a312..47c65f34 100644
--- a/fuzzers/019-ndi1mux/top.py
+++ b/fuzzers/019-ndi1mux/top.py
@@ -1,7 +1,5 @@
 import random
 random.seed(0)
-import os
-import re
 from prjxray import util
 
 CLBN = 50
@@ -9,7 +7,7 @@ print('//Requested CLBs: %s' % str(CLBN))
 
 
 def gen_slicems():
-    for _tile_name, site_name, _site_type in util.gen_sites(['SLICEM']):
+    for _tile_name, site_name, _site_type in util.get_roi().gen_sites(['SLICEM']):
         yield site_name
 
 
diff --git a/fuzzers/050-intpips/generate.py b/fuzzers/050-intpips/generate.py
index 84353ca0..13573664 100644
--- a/fuzzers/050-intpips/generate.py
+++ b/fuzzers/050-intpips/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, re
+import re
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 tiledata = dict()
 pipdata = dict()
diff --git a/fuzzers/051-imuxlout/generate.py b/fuzzers/051-imuxlout/generate.py
index 9627960b..66c23414 100644
--- a/fuzzers/051-imuxlout/generate.py
+++ b/fuzzers/051-imuxlout/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, re, os
+import re, os
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 tiledata = dict()
 pipdata = dict()
diff --git a/fuzzers/052-clkin/generate.py b/fuzzers/052-clkin/generate.py
index 2aca7188..fa5f9463 100644
--- a/fuzzers/052-clkin/generate.py
+++ b/fuzzers/052-clkin/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, os, re
+import os, re
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 tiledata = dict()
 pipdata = dict()
diff --git a/fuzzers/053-ctrlin/generate.py b/fuzzers/053-ctrlin/generate.py
index bbae2ecc..70d82ad2 100644
--- a/fuzzers/053-ctrlin/generate.py
+++ b/fuzzers/053-ctrlin/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, os, re
+import os, re
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 tiledata = dict()
 pipdata = dict()
diff --git a/fuzzers/054-gfan/generate.py b/fuzzers/054-gfan/generate.py
index 2f09618e..a05df06b 100644
--- a/fuzzers/054-gfan/generate.py
+++ b/fuzzers/054-gfan/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, os, re
+import re
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 tiledata = dict()
 pipdata = dict()
diff --git a/fuzzers/055-gnd/generate.py b/fuzzers/055-gnd/generate.py
index fd1d8d9f..04f38579 100644
--- a/fuzzers/055-gnd/generate.py
+++ b/fuzzers/055-gnd/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, os, re
+import re
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 tiledata = dict()
 pipdata = dict()
diff --git a/fuzzers/056-rempips/generate.py b/fuzzers/056-rempips/generate.py
index 16e2de41..56e761f8 100644
--- a/fuzzers/056-rempips/generate.py
+++ b/fuzzers/056-rempips/generate.py
@@ -1,10 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, os, re
-
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 tiledata = dict()
 pipdata = dict()
diff --git a/fuzzers/057-bipips/generate.py b/fuzzers/057-bipips/generate.py
index 11379236..903f2162 100644
--- a/fuzzers/057-bipips/generate.py
+++ b/fuzzers/057-bipips/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, os, re
+import os
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design.bits")
+segmk = Segmaker(util.get_db_root(), "design.bits")
 
 tiledata = dict()
 pipdata = set()
diff --git a/fuzzers/058-hclkpips/generate.py b/fuzzers/058-hclkpips/generate.py
index fc6f7b6d..72a4dab7 100644
--- a/fuzzers/058-hclkpips/generate.py
+++ b/fuzzers/058-hclkpips/generate.py
@@ -1,8 +1,9 @@
 #!/usr/bin/env python3
 
-import sys, os, re
+import sys
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
 tags = dict()
 en_tags = dict()
@@ -23,7 +24,7 @@ for arg in sys.argv[1:]:
 
 for arg in sys.argv[1:]:
     print("Processing %s." % arg)
-    segmk = Segmaker(arg + ".bits")
+    segmk = Segmaker(util.get_db_root(), arg + ".bits")
 
     tiledata = dict()
     pipdata = dict()
diff --git a/fuzzers/100-dsp-mskpat/generate.py b/fuzzers/100-dsp-mskpat/generate.py
index 13606f7b..870daf03 100644
--- a/fuzzers/100-dsp-mskpat/generate.py
+++ b/fuzzers/100-dsp-mskpat/generate.py
@@ -1,10 +1,11 @@
 #!/usr/bin/env python3
 
-import sys, os, re
+import sys
 
 from prjxray.segmaker import Segmaker
+from prjxray import util
 
-segmk = Segmaker("design_%s.bits" % sys.argv[1])
+segmk = Segmaker(util.get_db_root(), "design_%s.bits" % sys.argv[1])
 
 pipdata = dict()
 ignpip = set()
diff --git a/prjxray/segmaker.py b/prjxray/segmaker.py
index 8cd8ee41..887e2951 100644
--- a/prjxray/segmaker.py
+++ b/prjxray/segmaker.py
@@ -15,9 +15,6 @@ tilegrid.json provides tile addresses
 
 import os, json, re
 
-XRAY_DATABASE = os.getenv("XRAY_DATABASE")
-XRAY_DIR = os.getenv("XRAY_DIR")
-
 BLOCK_TYPES = set(('CLB_IO_CLK', 'BLOCK_RAM', 'CFG_CLB'))
 
 
@@ -41,7 +38,8 @@ def json_hex2i(s):
 
 
 class Segmaker:
-    def __init__(self, bitsfile, verbose=None):
+    def __init__(self, db_root, bitsfile, verbose=None):
+        self.db_root = db_root
         self.verbose = verbose if verbose is not None else os.getenv(
             'VERBOSE', 'N') == 'Y'
         self.load_grid()
@@ -60,9 +58,7 @@ class Segmaker:
 
     def load_grid(self):
         '''Load self.grid holding tile addresses'''
-        print("Loading %s grid." % XRAY_DATABASE)
-        with open("%s/database/%s/tilegrid.json" % (XRAY_DIR, XRAY_DATABASE),
-                  "r") as f:
+        with open(os.path.join(db_root, "tilegrid.json"), "r") as f:
             self.grid = json.load(f)
         assert "segments" not in self.grid, "Old format tilegrid.json"
 
diff --git a/prjxray/util.py b/prjxray/util.py
index c61654db..e08285ce 100644
--- a/prjxray/util.py
+++ b/prjxray/util.py
@@ -1,11 +1,10 @@
 import os
 import re
-import os
-import json
-
-DB_PATH = "%s/%s" % (
-    os.getenv("XRAY_DATABASE_DIR"), os.getenv("XRAY_DATABASE"))
+from .roi import Roi
 
+def get_db_root():
+    return "%s/%s" % (
+        os.getenv("XRAY_DATABASE_DIR"), os.getenv("XRAY_DATABASE"))
 
 def roi_xy():
     x1 = int(os.getenv('XRAY_ROI_GRID_X1'))
@@ -15,10 +14,6 @@ def roi_xy():
 
     return (x1, x2), (y1, y2)
 
-
-(ROI_X1, ROI_X2), (ROI_Y1, ROI_Y2) = roi_xy()
-
-
 def slice_xy():
     '''Return (X1, X2), (Y1, Y2) from XRAY_ROI, exclusive end (for xrange)'''
     # SLICE_X12Y100:SLICE_X27Y149
@@ -29,49 +24,14 @@ def slice_xy():
     ms = [int(m.group(i + 1)) for i in range(4)]
     return ((ms[0], ms[2] + 1), (ms[1], ms[3] + 1))
 
-
-def tile_in_roi(tilej):
-    x = int(tilej['grid_x'])
-    y = int(tilej['grid_y'])
-    return ROI_X1 <= x <= ROI_X2 and ROI_Y1 <= y <= ROI_Y2
-
-
-def load_tilegrid():
-    return json.load(open('%s/tilegrid.json' % DB_PATH))
-
-
-def gen_tiles(tile_types=None, tilegrid=None):
-    '''
-    tile_types: list of tile types to keep, or None for all
-    tilegrid: cache the tilegrid database
-    '''
-    tilegrid = tilegrid or load_tilegrid()
-
-    for tile_name, tilej in tilegrid.items():
-        if tile_in_roi(tilej) and (tile_types is None
-                                   or tilej['type'] in tile_types):
-            yield (tile_name, tilej)
-
-
-def gen_sites(site_types=None, tilegrid=None):
-    '''
-    site_types: list of site types to keep, or None for all
-    tilegrid: cache the tilegrid database
-    '''
-    tilegrid = tilegrid or load_tilegrid()
-
-    for tile_name, tilej in tilegrid.items():
-        if not tile_in_roi(tilej):
-            continue
-        for site_name, site_type in tilej['sites'].items():
-            if site_types is None or site_type in site_types:
-                yield (tile_name, site_name, site_type)
-
-
-#print(list(gen_tiles(['CLBLL_L', 'CLBLL_R', 'CLBLM_L', 'CLBLM_R'])))
-#print(list(gen_sites(['SLICEL', 'SLICEM'])))
-#print(list(gen_sites(['SLICEM'])))
-
+def get_roi():
+    (x1, x2), (y1, y2) = roi_xy()
+    return Roi(
+            tilegrid_file=os.path.join(get_db_root(), 'tilegrid.json'),
+            x1=x1,
+            x2=x2,
+            y1=y1,
+            y2=y2)
 
 # we know that all bits for CLB MUXes are in frames 30 and 31, so filter all other bits
 def bitfilter_clb_mux(frame_idx, bit_idx):
diff --git a/utils/fasm2frames.py b/utils/fasm2frames.py
index 361baa8e..db64fe7f 100755
--- a/utils/fasm2frames.py
+++ b/utils/fasm2frames.py
@@ -5,11 +5,7 @@ import re
 import sys
 import json
 import collections
-
-
-class FASMSyntaxError(Exception):
-    pass
-
+import fasm
 
 def parsebit(val):
     '''Return "!012_23" => (12, 23, False)'''
@@ -22,7 +18,6 @@ def parsebit(val):
     seg_word_column, word_bit_n = val.split('_')
     return int(seg_word_column), int(word_bit_n), isset
 
-
 # TODO: migrate to library
 def process_db(tile_type, process):
     fns = [