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TMS320F280037: SPLL_1PH_SOGI_FLL lock status

Part Number: TMS320F280037

Hi everybody,

What is the most simple and reliable way to determine that SPLL_1PH_SOGI_FLL is in lock state and successfully synchronized with input wave?

Now I compare u_Q[0] and u_D[0] and if Q component is less that 10% of D component then I consider that PLL is locked. But may be there is a better criteria?

Kind regards,