Cora USB Host Support Concern

[NemotoFutoshi]

I'm would like to use a Cora board for a project that requires Linux support for USB to UART dongles.

I have been thoroughly checking the Cora schematics that are published (thanks for doing so!!!).  I noticed something that is confusing.  Please note the net name "USB_HOST_CLK_12M" that is connected to the REFCLK input of the USB3320. 

I am unable to find a matching net name anywhere in the schematic.  Given that 12 MHz clock is required for the USB3320 operate properly given the REFSEL strapping, what is driving this net?

Can anyone confirm that the Cora board will operate as a USB host when running Linux?  Would someone at Digilent please explain the "USB_HOST_CLK_12M" net concern? 

Perhaps, for some "proprietary" reason the driver for "USB_HOST_CLK_12M" has been elided from the schematic (like the USB JTAG debug circuitry).  Maybe, I just overlooked the connection in the schematic.

Thanks,

Nemoto

 

 

 

Edited September 2, 2020 by NemotoFutoshi
Poor english, not first language. Confused device and host.

[JColvin]

Hi @NemotoFutoshi,

The 12 MHz clock comes from a 12 MHz oscillator that is powered by the 3.3V power rail; it's on that missing page of the public version of the schematic.

The Cora board can be used as a USB host through Linux, though the number of examples demonstrating this are fairly limited.

Thanks,
JColvin

[mizzi]

can we perhaps get the missing pages ?

i'm trying to install petalinux 2021.2 and all is running with the exception of the USB host !

if digilent does not supply a 2021.2 bsp and the schematics are missing it's hard to fix the issue. 

are you sure that the oscillator is the problem? i  do not see USB VBUS power and think it's the trouble with MIO11!

Would be nice to get some info how to solve this problem!

Thanks Thomas