Cached database for xc7a50tfgg484-1:
http://scratch.clifford.at/prjxray/grid-xc7a50tfgg484-1-db.html
http://scratch.clifford.at/prjxray/grid-xc7a50tfgg484-1-db.json
http://scratch.clifford.at/prjxray/grid-xc7a50tfgg484-1-db.txt