Thank you for your kindly reply.
I understood how to change frequency from external 28.636MHz to 27.0MHz of LLC by internal PLL.
ADV7180 change s-video signal from Analog to Digtal by ADC, in 28.636MHz rate. (sampling rate)
And ADV7180 output digital data(ITU-R BT.656) in LLC(27.0MHz) rate. (output rate)
Output rate(27.0MHz) is slower than sampling rate(28.636MHz).
Does ADV7180 have memory(FIFO?) to save sampling data in 28.636MHz rate?
And, does ADV7180 output from the memory in 27.0MHz rate?