Timeline for Which USB spec actually defines support for Dual Role Device? Type-C or USB 3.1?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| Jun 16, 2021 at 11:36 | comment | added | MacGuffin | " (still cannot figure out what OTG means) " It was called "on the go" because it was built for use on portable devices. A device large enough for 2 USB ports would not need a dual role port since there is a port for both roles. It is a violation of the spec to have both OTG and more than 1 USB port. Large devices needing both roles, such as a printer that is a client to a computer and host to a flash drive, will not be expected to require disconnection from the computer to read files from the drive. Acting a USB client to 2 hosts is somewhat nonsensical as that is best by a network. | |
| Mar 20, 2021 at 23:02 | vote | accept | Wisteso | ||
| Mar 20, 2021 at 23:02 | comment | added | Wisteso | Okay that makes sense. So basically Type-C is the only type that can flip between both then? (Due to non-conformance to OTG) Otherwise you have to be device-only (B, micro, mini) or host-only (A)? | |
| Mar 20, 2021 at 15:36 | comment | added | Ale..chenski | @Wisteso, No, Type-B port is only for devices, and thus is not "swappable".. Mini and micro ports must be of dual "A/B" type to be "swappable", although the industry abandoned "A/B" and used only B-type receptacles in formal violation of OTG specs. | |
| Mar 20, 2021 at 3:34 | comment | added | Wisteso | This is nicely explained. Just to confirm... this means Type-A can never be OTG / Dual Role? However Type-B, Mini, Micro, and Type-C are able? The power / data part makes sense, and that part was fairly clear, but I didn't know about the extra pin needed to facilitate swapping. | |
| Mar 20, 2021 at 1:58 | history | answered | Ale..chenski | CC BY-SA 4.0 |