CRD-30DD12N-K reference design : control board : frequency of crystal oscillator

gkim

Hello,

With respect to the reference design of CRD-30DD12N-K, I have a question on the control board.

It seems that the part number Y3 is a crystal oscillator for the DSP.

I wonder what the output frequency of Y3 is.

Thank you for your consideration.

With regards,

GKIM

gkim

Hello,

It seems that the output frequency of the crystal oscillator Y3 is 10MHz or 20MHz with reference to its firmware: the function of InitSysCtrl().

Meanwhile the internal oscillator is employed in calling the function InitSysPll() in InitSysCtrl().

I wonder why the nternal oscillator is employed as the PLL source instead of the external crystal oscillator.

Thank you for your consideration.

With regards,

GKIM

Iris

Hi GKIM,

Yes, the internal oscillator is selected and configured in this design. Both internal and external oscillator are available. As you see, Y3 is a external crystal oscillator with10MHz, which is available if you want to change to external oscillator. Thanks!