clock groups options

Hello,

I see that there are few clock group options in sdc.

1. -asynchronous,

2. -logically_exclusive,

3. -physically_exclusive.

I believe all these options can create asynchronous relationship for the set clocks.

Hence i guess using any of these should serve the purpose of disabling timing check on two clock groups,

Please let me know is there anything more here on defining clock groups with -logically_exclusive, -pyhsically_exclusive.

regards,

frk