harpoon
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If you have access to IBM, then they have a whole host of documentation and examples. Also, I have found that their foundry tech support can be quite helpful as well.
That aside, I/O rings are usually concerned about a few things :- a) ESD protection b) RF pads (lower parasitic, weaker protection diodes ...) c) Clamp cells and latchup d) Analogue to digital stitch up/isolation e) Power distribution (voltage drops and current handling)
If you cover all of the above, you're in great shape.
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