This design is a universal register which can be used as a straightforward storage register, a bi-directional shift register, an up counter and a down counter.
dvbsnoop is a DVB/MPEG stream analyzer program.
The program can be used to sniff, monitor, debug, dump
or view DVB/MPEG/DSM-CC/MHP stream information (digital
television or data broadcasts) sent via satellite, cable
or terrestrial.