If I'm not using both USB0 and USB1 in my design for C6747, what should I do with the USB pins?

Hello,

According to USB U.G. （sprufm9d）

http://focus.tij.co.jp/jp/general/docs/litabsmultiplefilelist.tsp?literatureNumber=sprufm9d

page 17, Table 3.　USB Terminal Functions,

USB0_ID is PU or PD with 10kOhm.

Which one is the best between your recommend and sprufm9d?

Thank you for advance.

I think either way would be fine. I will look into this.

The recommendations in the forum above are in the datasheet page 52 as well:

http://www.ti.com/lit/gpn/tms320c6747

Thank you very much for your response.

Can I ask two more question?

1) Why USB_DM and USB_DP are difference between "both USB not used case" and "only USB0 used case"?

2) One of my customer willing to use Logicpd OMAP L-138 SOM module to their product.

Logicpd Module's USB peripheral is already connected to PWR,

but they don't use USB peripheral in their product.

In this case, what should they do USB_DP, DM, ID? (NC is OK?)

Thank you again.

Actually, the ID pin can be left as NC on this device if USB is not used, so no pullup or pulldowns are required. We will update the user guide to match the datasheet in this regard.

1) USB0 powers the USB1 PHY internally, so the USB1 DM/DP pins should not be left floating in this case.

2) If the power is connected to both USB peripherals, then the DP/DM pins should be grounded even if they are not used. The ID pin can be left as NC.

Thank  you very much for your answer.  I clearly understood that. :)