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USB superspeed peripherals

HuEl_264296
New Contributor II

This question is further to: Does the CX3 really need a clock buffer? 

What are the drive requirements for the REFCLK and CLKIN pins on the CX3?  If I want to select an oscillator to drive them, I need to know the input current and capacitance of these pins The datasheet and TRM don't seem to give this information.

Is this information available somewhere?

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Rashi_Vatsa
Moderator
Moderator

Hello,

Please refer to the IBIS model https://www.cypress.com/documentation/models/cyusb306x-ibis  for the capacitance values for each pin.

Regards,
Rashi
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Rashi_Vatsa
Moderator
Moderator

Hello,

You can refer to Tania kit schematics for the oscillator part https://www.cypress.com/documentation/development-kitsboards/tania-cypress-cx3-socionext-isp-referen... as Tania kit uses the same oscillator for driving REFCLK and CLKIN without a clock buffer

Regards,
Rashi
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HuEl_264296
New Contributor II

Thanks for this. Unfortunately I was unable to access this document, even though I am logged in.

Apologies for any inconvenience caused.

You are not authorized to access this page or it may have been removed from the site and is no longer available on Cypress.com. Please contact our webmaster support for more information.

 

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