Dual Clock Comparator (DCC)
modules, used to determine the accuracy of a clock signal during the time
execution of an application, each having the following main features:
Two independent
counter blocks count clock pulses from each clock source
Each counter block is
programmable, however, for proper operation the counters must be
programmed with seed values that respect the ratio of the two clock
frequencies
Configurable time
base for error signal
Error signal
generation when one of the clocks is out of spec