LPC1830 - USB does't work in HS

[lpcware]

Content originally posted in LPCWare by Ivar on Sun Apr 27 14:16:23 MST 2014
Hello,

I made a board using the LPC1830. The USB0 not connect in HS, just plug in FS.

The same program in a LPB1857 Hitex board plugs into HS.

Tests done as Host and  Device mode. They work at Hitex board in HS, but in our board only work in FS.

It would be hardware problem?  The tracks D+ and D- have no resistor. Were made with balanced (equal length and parallel) mode.


Please can someone help me?

Ivar

[lpcware]

Content originally posted in LPCWare by Ivar on Tue Apr 29 10:49:51 MST 2014
Hello GTA,

Thank you for the reply.

Unfortunately I do not have USB analyzer.

The board has four layers with a ground plane and the other for power.

The USB stack that did the tests is uVision.

But your suggestion is perfect. A HW analyzer indicate whether it is a hard ou software problem. I'll try to do this analysis.

Thank you again.

Ivar.

[lpcware]

Content originally posted in LPCWare by GTA on Tue Apr 29 03:13:09 MST 2014
* Have you analyzed the USB enumeration sequence with a protocol analyzer (preferably a HW analyzer)?
* To say anything about the USB HW design, you would need to post more information about it. Differential pair layout, board layer config, surrounding layout.
* Which USB stack do you use?

BR,