USB hosts hubs transceivers Forum Discussions

[role_1685151]

Dear All.

We made evaluation board using CY7C65634-28LTXC. USB 2 devices connected to DS ports directly.

DS port devices were high speed devices. The HUB has been recognized as a device. but one device of DS ports  was not recognized to device manager.

We had swapped DS1 and DS2 after cutting DP,DM line. then,  It was changed to result.

DS1 - detect / DS2 - not detect  ----swap DS1 and DS2 ----> DS1 - not detect / DS2 - detect

Original DS2 port device has connected to HX3 EVK DS1 via jumper wire. then It was recognized on HX3 HUB DS device.

What is a problem?  What should we check for solve?

Regards.

[Sananya_14 · Accepted solution]

Hello,

-Please check if the USB traces in your board meets the layout guidelines mentioned in the App Note.

-Does the issue occur with any other device connected to DS2 of your board? Could you please check if there is any error message when the DS2 device is connected or if it doesnt enumerate at all on the host?

-Please try if the original DS2 device is recognized on a CY4608 DVK.

EDIT: As per case on the same issue, please check if the high speed termination resistor RREF is 649 ohm.

Best Regards,

Sananya