In CHI how the Slave side is giving the L-Credits to the Master Side

Hi All,

I am new to the CHI Protocol, 

I am Okay with Link Level Connection Establisment state machine. In Spec it says that in RUN state slave can sent the Credits to the Master

How this Credit is begin Trasfered is there any process for that?

or any particular channel there?

or randomly slave set its max of 15 credit to the master in Run State ?

Regards,