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Questions on Link diagnostics registers of DP83849IV

According to the datasheets,

Two values can be read from FREQ100 register.

One is "Frequency Offset" and another one is "Frequency Control value" depending on Bit 8.

Q1) Is there more clear definition of these two values? I cannot understand it clearly.

Q2)  If I want to know system jitter, Is this equation right?

         : System jitter[ppm] = ["Frequency Offset" -"Frequency Control value"] * 5.1562

Another registers- Variance Control Register/Variance Data Register

Q3) What unit can be applied to 32 bit Data read from Variance Data Register ?

       :When I read this value, the value was 622208, 625236, etc. what does it mean?

Best Regards

Hak-Jin Jeong