CYPD3175 with UFP DisplayPort

[YiZ_31]

Hi,

In the firmware I sent to you, enable UFP_ALT_MODE_SUPP marco and set UFP_MAX_SVID_SUPP to (1u). Test the firmware and let me know if the issue still exists.

Regards,
Eddie

[JeGr_4019896]

Hi Eddie,

I was able to make the CYPD3175 work correctly with a modified version of the FW you sent me.

I am running into a new obstacle now. If I use a USB-C cable from Apple, the alt mode functionality no longer works. It appears that with an Apple cable the Enter Mode Request never happens. Please see the images attached.

^Discover Identity between source and sink

^With Apple Cable

^Non apple cable

Thanks,

Jeremy

[YiZ_31]

Hi Jeremy,

If my understand is correct, your source device stop sending Endter Mode with an Apple Cable. May be you should take a look at your source device.

Regards,
Eddie

[YiZ_31 · Accepted solution]

Hi Jeremy,

Have you set Modal Operation supported to Yes? That could cause some of this kind of issue.

Regards,
Eddie

[JeGr_4019896]

Hi Eddie,

I do not have control over the source device, I can only configure the cypress chip in this setup.

I do have modal operation supported. I am wondering if this is a problem related to thunderbolt 3 not being supported by the FW of CYPD3175.

Jeremy