AM5716: DPLL minimum multiplier setting

I'm currently reviewing the DPLL settings for the AM5716 design I'm using.  The output frequency of the PLLs are generally determined by the formula (M / (N + 1)) × FINP.  A note in Section 3.6.3.3.2 of the Technical Reference Manual states that "It is preferred to minimize the value for N parameter (it minimizes lock time and jitter). Then M should be chosen to provide correct frequency (with lowest delta as possible)."  My question is if there are any requirements for the value of M or if M can be any value.