I have generated the PAD report from the Implementation tool.
There are some discrepancies between this report and the report generated in the MAP stage (*.mrp report file) for the IOB cells.
Which report is correct?
This is a known issues for the PAD report.
This problem has been reported in ISE 12.3 up to 13.3.
For some parts the number and location of some IOB cells are not listed under the PAD report.
It is recommended to follow Section 6 - "IOB properties" from the MAP report when checking the IOB cells.