USB3.0 CY3014 Spread Spectrum - deviation from USB3.0 standard

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USB3.0 CY3014 Spread Spectrum - deviation from USB3.0 standard

Anonymous
Not applicable
‎Jan 09, 2019 08:52 AM
‎Jan 09, 2019 08:52 AM
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On the USB3.0 interface of the CY3014 (FX3), we see some deviations on the Spread Spectrum (SSC) 5GHz when comparing to the USB3.0 standard. The standard prescribes min.-5300ppm/-3700ppm and max.300ppm. USB PHY tests made at external digital testing lab, shows that the SCC is unstable and out of USB range (-5400ppm and 500ppm). We are using the recommended ASEMB-26.000MHZ-LY-T (10ppm) oscillator. What could be wrong? All other USB3.0 tests passes...

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Re: USB3.0 CY3014 Spread Spectrum - deviation from USB3.0 standard

abhinavg_21
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50 likes received 25 likes received 10 likes received
‎Jan 10, 2019 04:36 AM
‎Jan 10, 2019 04:36 AM
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Hi Jacob,

Please check whether the USB cable lengths are in accordance with the spec. If you are using longer cable length then I will suggest you to use following API's

>> CyU3PReturnStatus_t CyU3PUsbSetTxSwing (uint32_t swing) - This will increase the Txswing which will helps us to pass through long length cables.

>> CyU3PReturnStatus_t CyU3PUsbSetTxDeemphasis (uint32_t value) - this will control the noise and jitters.

Thanks & Regards
Abhinav Garg

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