SPRZ519 august 2023 IWR2243
DCC Module Frequency Comparison can Report Erroneous Results
IWR2243 ES1.0, ES1.1
The Dual-clock Comparator module, which is used to monitor a clock frequency while comparing with a known clock reference, could stop earlier than expected, and, thus, indicating the measured clock frequency to be lower. This is due to a clock domain crossing issue causing the error detection logic to get triggered. This incorrect reporting, can cause a rare failure in the DCC monitor used to monitor internal clock frequencies.
Multiple measurements can be taken for the same clock pairs, and the median of the frequencies reported can be used for detecting failure.