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grid.py: open-flow bring-up tweak 

Captured from the openXC7-based open-flow sessions (VC707 virtex7).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Dr Jonathan Richard Robert Kimmitt 2026-07-04 20:29:48 +01:00
parent 0e3f20b577
commit 21c5533873
1 changed files with 10 additions and 0 deletions
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10
prjxray/grid.py
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@ -144,6 +144,16 @@ class Grid(object):
any_alias = True
if any_alias:
# Prefer the tile type's OWN segbits database when one
# exists (e.g. segbits_liob18_sing.db): its bit positions
# are in the tile's native window. The alias path is a
# fallback for tile types fuzzed only via their alias; on
# virtex7 IOB SING tiles the alias metadata is wrong (site
# map names IOB33, start_offset misplaces the words) and
# silently corrupts neighbouring tiles' frames.
tile_db = self.db.tile_types.get(gridinfo.tile_type)
if tile_db is not None and tile_db.segbits is not None:
return self.db.get_tile_segbits(gridinfo.tile_type)
return TileSegbitsAlias(self.db, gridinfo.tile_type, gridinfo.bits)
else:
return self.db.get_tile_segbits(gridinfo.tile_type)