DW1000 Clock check

Hi all.

I would like to check if the clock disappears from dw1000.
We tested communication with two dw1000 boards. tx, and rx timestamps, we have found that an error occurs once in a while. I would like to check if the clock has failed to provide it normally. If you use the SYS_STATUS_ID, SYS_MASK_ID registers, I do not know how to use it. In order to solve this problem, we ask if we should set other register value first.

Help me please.