Is Combinational loop synthesis ?

hello,

I know that combinational loops are inveterately considered as a bad design ? but I have seen few designs which employed combinational loops and have worked well on the silicon too.... For example, a controllable ring oscillator... So is it ok to have combo loops in the design ? what are the consequences of doing it or to be precise what are the limitations for wmploying it ?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References:

http://www.edaboard.com/showthread.php?t=372034

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