Hello, I have a question about ORFS. If I don't care about the io ring, can I set the " core area = die area "? Actually, In normal case, I noticed the pins are placed around the die, whether the corner pads and IO pads be placed? I'm so confused

I think that should be fine. There are two things you will want to look out for: 1) In the case where a cell is placed right along the edge, you could run into an issue if an I/O pin is placed near it in too low of a layer. For example if your pin is in M2, a cell underneath it might be unable to connect without shorting to the pin. 2) Likewise if there are several pins in the area along the edge, this could cause congestion if there are cells underneath it and make that region unroutable.

I get it, thank you very much!