[sdiy] Does usb c alternative mode allow analog signals on the multi-purpose pins?

[Didrik Madheden]

Hmm. On that note, how are those wired? There are pins reserved for two rx
and two tx differential pairs, which are somewhat protocol agnostic. Those
can be used for PCIe within the USB 3 standard, or to transfer video data.
Whether any given adapter is fully standards compliant is a different
issue, but those would be logical pins to use. Or do those adapters use
other pins for PCIe lanes as well like USB2 D+ and D- or CC/SBU?

/Didrik

On Tue, 15 Nov 2022, 23:42 Mike Bryant, <mbryant at futurehorizons.com> wrote:

> Well that was effective then ... NOT :-)
>
> All the Chinese vendors have now agreed on a standard wiring for PCIe
> extension over the USB-C cable.
>
> ------------------------------
> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of
> Chromatest J. Pantsmaker via Synth-diy <synth-diy at synth-diy.org>
> *Sent:* 15 November 2022 20:23
> *To:* cheater cheater <cheater00social at gmail.com>
> *Cc:* synth-diy <synth-diy at synth-diy.org>
> *Subject:* Re: [sdiy] Does usb c alternative mode allow analog signals on
> the multi-purpose pins?
>
> "NOTE: Adopters may only use the USB Type-C® cable and connector to
> implement USB or third party functionality as expressly described in this
> Specification; all other uses are prohibited."
> From:
>
> https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%20R2.0%20-%20August%202019.pdf
>
>
> On Tue, Nov 15, 2022 at 11:08 AM cheater cheater via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> As in subject. Is there anything in the spec that speaks against this?
> Where would one go in order to get a definitive answer to this?
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