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Minimal USB-OTG connection for serial downloader

Question asked by Frank Ambrosious on May 11, 2016
Latest reply on May 11, 2016 by Yuri Muhin


Dear all,

 

We have developed a i.MX6 Dual Light board where we deliberately left off the USB-OTG. The DP and DN signals are available on test-pads on the board. The other signals (VBUS and ID) are not available. These are left floating.

 

For various reasons we now want to (temporarily) use the USB OTG.

 

When we connect only the DP and DN lines to a PC (short wires to a USB connector), nothing happens when we start a fresh board (nand flash empty, no fuses burned, boot-mode = 00) .

 

The questions:

1) Is it enough to only connect DP and DN?

2) Should a fresh board in boot-mode 00 always end up in the serial downloader?

3) What should we measure on the DP and DN when the serial downloader starts?

 

Thank you in advance for your help!

 

Regards,

Frank

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