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If by "pad frame" you mean the IO ring, or the arrangement of the IO cells around the edge of the chip, then there are a few ways you could do this. You could start with default placement of the IOs, then output an IO file, and modify it to your liking. Sometimes we get a spreadsheet from the customer or package folks, and write a perl script or something to parse a text version and put it in the format of the FE IO file, or DEF format.