The value of tmnxMDAClockMode specifies the clock mode
of the MDA.
notApplicable - The MDA does not support any clock modes or domains.
adaptive - The MDA is in 'adaptive' clock mode. This allows
adaptive clock domains to be created.
differential - The MDA is in 'differential clock mode. This allows
differential clock domains to be created.
The value of tmnxMDAClockMode can be changed when there are no ports
created on the MDA. If there are ports created, a shutdown of the
MDA is required in order to change the value.