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Zybo - USB3320


Question

Hi,

I'm looking at the Zybo USB OTG Schematic and the USB3320 datasheet. I noticed that USB3320's REFCLK(USB_CLK_12M Net label is not connected another label) pin is not connected. I read in the datasheet that the refclk pin needs to be connected to the crystal. Can you explain why the REFCLK pin and the crystal are not connected?

 

Ekran görüntüsü 2021-09-09 154909.png

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Hi @Cristopher8,

The USB_CLK_12M line that is attached to the REFCLK pin on the USB3320 is sourced from a 12 MHz oscillator (a DSC1033CC1-12.000); this particular component is located on the "this page intentionally left blank" page of the Zybo Z7 schematic.

Let me know if you have any questions.

Thanks,
JColvin

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