$skew, $timeskew

SystemVerilog
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1

I need to write an assertion on one command. The minimum delay between one command to the next appearance of same command is 10.5ns. So, Can I use $skew or $timeskew in this scenario?? If not, what is best method to write assertions for timing checks, which have units in ns(nano seconds).
Can you provide some examples on how to use $skew, $timeskew, $fullskew.

2

In reply to nani9483:

hy,
Here I write syntax of $skew.$timeskew and $fullskew :
$skew(reference_event, data_event, limit [ , notifier ] );

$timeskew(reference_event, data_event, limit [ , notifier ] [ , event_based_flag ] [ , remain_active_flag ];
$fullskew(reference_event, data_event, limit [ , notifier ] [ , event_based_flag ] [ , remain_active_flag ];