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iPhone 15 Models Have 'Completely Standard' USB-C Port Without Restrictions on Accessories
(www.macrumors.com)
This is a most excellent place for technology news and articles.
They're using an apb node of the main axi bus, they need to promote usb to a full axi node or put it on a faster clocked apb node.
Power Islanding, but also the IP isn't drop in, if they're using synopsys there's a few changes they have to make, it's a much bigger block.