TUSB2046B: Windows/Linux operating systems do not detect the HUB. It does not work

Hi,

Does anything appear in device manager when connected to a Microsoft host? Can you check levels on DP0 / DM0? Also does the crystal start?

Regards,
JMMN

Hi,
thanks for your feedback. Nothing appear in device manager when connected to a Microsoft host. The Crystal could start und the Level on DPO/DMO was approximately 3,1v.
I also pullup the reset pin with 1.5k resistor to 3.3V and 1uF tied to gnd.

Best Regards,
Ludo

Hi Ludo,

Only DP0 should be pulled high, DM0 should be low if it is powered on and not enumerated. Can you check that the DP / DM lines did not get swapped in layout?

Regards,
JMMN

Hi JMMN,

i checked the System and the DP / DM lines did not get swapped in layout. I pulled up the reset pin with 1.5k resistor to 3.3V and 1uF tied to gnd. Is it ok ? EEGATA/GANGED is floating. should i pull it down or up ?

Regards,
Ludo

GANGED can be pulled down. Can you confirm that the upstream port has 15K pulldowns installed on DP / DM (or they are incorporated internally)? What is the status on the SUSPEND pin?

Hi,

Today i pulled GANGED down  and checked the oscillator. I only pull down alls the 4 Downstream port with 15K. should i pull the upstream also with  15k ?

I checked my system Today and windows could detect the device bot Linux. Tomorow i will check the system because the Downstream port doesnt work.

The device show USB 1.1 on Windows (like in the picture ) is it correct ??? because the other Hub was showing usb 2.0  

Hello JIMM,

the device could work correctly on windows. But i still have this Problem in Linux.

Do you know how i can fix this problem ?

Thanks. 

The TUSB2046B is a full speed hub (USB 1.1), so it is correct for it to report that in the descriptors.

Do the downstream ports work in Windows?

Most USB host controller have internal 15K pulldowns and thus external pulldowns are not needed between the host and the upstream port of the hub, but I just wanted to confirm that this was the case.

Which Linux kernel are you using?

Regards,
JMMN

Do the downstream ports work in Windows?

yes all downstream ports work correctly in windows.

There is no pulldowns between the host and the upstream port in my circuit. Ther is only a 1.5k pullup. the Voltage on D+ was arrond 0.9v while Pullup. and D- was 0.8v. Is it correct ?


I m using Linux-imx version 4 based on Mainline with an IMX6 processor.

Regards,

Yes the downstream ports power on. But i still have no communication between the Upstream and the Host.

DP and DM are not connected to each other. If the module is off I have arrond 3V on DP and about 0V on DM.
When the module starts I get DP(0.9V) and DM(0.7V).

Ok, physically the DP/DM connections seem fine. Can you check to see if there is an update to the Linux Kernel? We don't see the same issue with TUSB2046B on other Linux builds.