I’ve made a Cursed USB-C 2.0 device

Re:I’ve made a Cursed USB-C 2.0 device by mschuster91 on Monday March 22, 2021 @08:14AM (#26539730)

Am I reading this right that by shorting the up and down D+ (and D-) line as one is supposed to by the spec, one essentially creates a HF stub?

Or doesn't the stub matter for signal integrity / EMI because it's only a couple of mm and fully enclosed by the shield of the plug and the receptacle?

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Re:I’ve made a Cursed USB-C 2.0 device by NovemberWhiskey on Monday March 22, 2021 @11:06AM (#26541876)

I think it just means that there's only actually a single differential pair for USB 2 so connecting the two "D+"s from each side of the connector, and the same for the "D-"s, is recommended.

This doesn't work for the super-speed differential pairs because they're actually different lanes.

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Re:I’ve made a Cursed USB-C 2.0 device by Sebb767 on Monday March 22, 2021 @08:31AM (#26539878)

The tweet with the spec talks about USB2.0 devices, so it's probably not as sensitive as higher speed 3.0+ device would be (just guessing here)

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