> - The chip I am intending to use has a buildt in fifo. How big is the FIFO? What is your sample rate? How many bytes do you therefore intend to transfer each 1mS USB frame time? I think you'll find that the FIFO in an ordinary USB chip will be way too small. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body