The strange thing to me is why ARM, which is about chips with small area, where you don't need chiplets, cares.
If you do get involved with chiplets, which ARM says will be "because AI" (sigh), you need physical and logical interconnect standards, something ARM has been doing for a long time for SoC-internal connections: the AMBA bus standard.
If you do get involved with chiplets, which ARM says will be "because AI" (sigh), you need physical and logical interconnect standards, something ARM has been doing for a long time for SoC-internal connections: the AMBA bus standard.