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My understanding is that a chip design for one fab isn’t portable to another.

How does can hobbyist design be just be slapped onto a wafer (with others’ designs) and call it a day?

Indeed, you develop using a fab-specific PDK. But if you share a (Tower Semi, for instance) PDK, your device can have shuttle wafers with multiple designs from different companies. This is done for old nodes and low-volume or RnD parts.

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