Snitch Frontend

Proposed Flow in Snitch

Instruction	function
DMSRC, DMDST	setup the transfer
DMCPY	launch the transfer
DMSTAT	poll until the transfer is done or error arises
DMERI	retrieve error cause and beat address (optional if error handling enabled)
DMERH	handle the error (continue, abort, replay) (optional if error handling enabled)
DMSTAT	poll until transfer is done