i.MX8QM PLL spread spectrum support

[rajasj]

Hi All, 

We are using the IMX8QM platform, we wanted to enable spread spectrum support for the HDMI interface. We went through this page:

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX6-PLL-spread-spectrum-support-i-MX6%...

But it has support only till IMX7. Could you please let me know how we could do this for the IMX8 platform.

Thanks

[rajasj]

Hi Brian,

Thanks for you response. In our system, we are connecting a OLED display to the IMXQM using a flex HDMI cable. We are having issue of seeing 3 spikes in the EMI spectrum. The OLED manufacturer identified these are characteristics of the device and there is ‘SSFM’ technology in the HDMI standard to reduce these specific frequencies. We checked the SCFW porting kit, but the current changes are only for LVDS and not HDMI. Could you please help us to solve this issue? Let me know if you need any additional information.

[brian14]

Hi @rajasj,

Thank you for contacting NXP Support.

The HDMI interface on iMX8QM platform does not support spread spectrum.

Have a great day!