IMX6S spread spectrum for PLL2 PFD[0:2]

kanoumamoru — Tue, 06 Jan 2015 11:16:59 GMT

Hi,

As my understanding PLL2 (system PLL) 528Mhz only supports the spread spectrum in i.MX6S.

Does the PLL2_PFDs (PFD0=352MHz, PFD1=594MHz, PFD2=396MHz) also should support the spread spectrum ?

PLL2_PFD is deriverd form PLL2 according to following formula.

PLL2_PFD = PLL2 * (18/N)

(N is from 12 to 35)

According to additional PLL2_PFD, the function of the spread spectrum fades away ?

Regards,

Kanou

Re: IMX6S spread spectrum for PLL2 PFD[0:2]

igorpadykov — Tue, 06 Jan 2015 12:25:16 GMT

Hi Mamoru

>As my understanding PLL2 (system PLL) 528Mhz only supports the spread spectrum in i.MX6S.

Correct.

>Does the PLL2_PFDs (PFD0=352MHz, PFD1=594MHz, PFD2=396MHz) also should support the spread spectrum ?

Yes, since they are sourced from PLL2. Description can be found in

EB790 Configuration of Phase Fractional Dividers

>According to additional PLL2_PFD, the function of the spread spectrum fades away ?

Yes if you are speaking about absolute value.

Best regards

igor

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