accumulator dco for adpll design

[tv123]

https://www.edaboard.com/threads/165905/

Can anybody explain me details about accumulator dco. I am using this for my adpll design . I have attached a link based on an old thread.
Thanx in advance

 

[FvM]

It's essentially the phase accumulator of a NCO, without the sine table. Use the accumulator MSB as digital oscillator output.
https://en.wikipedia.org/wiki/Numerically_controlled_oscillator

 

[tv123]

Can it be used with adpll design?
Can you suggest me any more study materials.