LS1021A USB3.0 device mode usage

JHY — Thu, 22 Jan 2015 01:50:59 GMT

I have TWR-1021A board and it is needed to test usb3.0 port in device mode.

But TWR-1021A usb3.0 port is connected to hub and schematics is not on the website.

Is it possible to tell me how can remove usb3.0 hub in that board?

Is NDA needed for that?

Re: LS1021A USB3.0 device mode usage

alexander_yakov — Thu, 22 Jan 2015 02:01:34 GMT

Schematic in PDF format is available with board, on Freescale CD/DVD or USB stick.

Schematic in PDF format is not under NDA, the only board design sources (Schematic source file, board layout) are under NDA.

To sign NDA you should contact your local Freescale Sales/Marketing office (or representative).

No, it is not possible to remove USB 3.0 hub, sorry.

Re: LS1021A USB3.0 device mode usage

b_j_buchalter — Thu, 02 Apr 2015 21:38:46 GMT

Actually, it is possible to remove the USB 3.0 hub. It requires a bit of skill with a soldering iron and SMT rework gear, but if you have the tech capabilities, the procedure is as follows (obviously, this will void any warranty; do it at your own risk, etc.). We have done this here and have verified using the USB 3.0 controller in device mode:

To Convert the TWR-LS1021A board to USB Device mode:

1) Remove the LS1021A Heatsink Clip (but not the heatsink)

2) Remove U29 (Top Of Board)

3) Remove U41 (Bottom Of Board)

4) Cut the 2 traces below C101 & C102 (to remove the stubs)

5) Cut the 2 traces to the right of C127 & C128 (to remove the stubs)

6) Prepare a USB3 cable with a Type A connector (you can cut the Type B connector off of a standard A->B cable)

7) Solder the TX pair conductors of the cable (e.g. TX from host) to the bottom pads of C101 and C102
8) Solder the RX pair conductors of the cable (e.g. RX to host) to the bottom pads of C127 and C128

9) Solder the DP wire to pad 53 for U29
10) Solder the DN wire to pad 54 for U29

11) Solder the VBUS wire to Pin1 of L31 (on the bottom of the board)

12) Solder the GND wire to the ground pad under U29

13) Wedge the cable with exposed shield between the shield cans of the Ethernet connectors to allow the cable to be mostly shielded

Now you can rebuild linux with gadget support and the DWC3 USB Controller in gadget mode. If you have a gadget driver loaded, the USB controller will connect to the host in device mode.

Best regards,

B.J. Buchalter

Metric Halo

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LS1021A USB3.0 device mode usage

Re: LS1021A USB3.0 device mode usage

Re: LS1021A USB3.0 device mode usage