topic Vybrid NAK USB test mode in Vybrid Processors

Vybrid NAK USB test mode

neil3 — Thu, 20 Jun 2024 11:26:52 GMT

I've successfully setup USB test modes on the NXP Vybrid A5 core, by following instructions in the Vybrid reference manual, section 11.1.6.3.14 (Port Test Modes -Host Operational Model).

This works for Host mode tests such as the Packet test but I cannot get the NAK (device) test to work.

What is the sequence to set up this test?

Does the device need to be set in USB Host mode or Peripheral mode?

Many thanks

Re: Vybrid NAK USB test mode

Manuel_Salas — Thu, 20 Jun 2024 22:35:42 GMT

Hello @neil3

Could you please point to me the exact document that you are referring?

Thank you!

BR,

--... ...--

Salas.

Re: Vybrid NAK USB test mode

neil3 — Fri, 21 Jun 2024 08:24:46 GMT

Hi @Manuel_Salas ,

The document is "VFxxx Controller Reference Manual, F-Series, Document Number: VYBRIDRM, Rev. 8, 11/2015".

Available from here:VFxxx Controller Reference Manual - VYBRIDRM (nxp.com)

Many thanks,

Neil

Re: Vybrid NAK USB test mode

Manuel_Salas — Mon, 24 Jun 2024 16:51:12 GMT

Hello @neil3

In host mode, you should see Single Ended Zero (SE0), that the both lines are pulled low. In device mode you should see NAK.

Best regards,

--... ...--

Salas.