Vybrid NAK USB test mode

[neil3]

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

[Alejandro_Salas]

Hello @neil3 

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

Thank you!

BR,

--... ...--

Salas.

[neil3]

Hi @Alejandro_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

[Alejandro_Salas]

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.