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userbinator 2 days ago

They are USB3-connected PCIe endpoints, which allow the PCIe NVMe drive to connect to the host as an NVMe device

No?

https://us1.discourse-cdn.com/flex001/uploads/framework3/ori...

This is an RTL9210B NVMe enclosure. It's a UAS device (and I believe it supports BOT too.)

I have not examined this in much detail but I believe these converter ICs are actually rather powerful SoCs with PCIe host, SATA host, and USB device peripherals. The existence of firmware (several hundred KB!) for them is further evidence of this fact.