A theoretical proposition to characterize speed based performance of Bulk transaction in Universal Serial Bus 3.0 SuperSpeed protocol

摘要

Universal Serial Bus 3.0 is one of the much sought after communication based protocols that acts as an interface between computers and other electronic devices. With a well defined SuperSpeed of 5 Giga bits per second, it provides backward compatibility to its predecessors. It suits for small devices which are not self powered. It has an increased bandwidth and power save states that are enhanced with efficient bus utilization through asynchronous signaling. It defines transfer modes such as bulk, isochronous, interrupt and control along with a new bulk streaming protocol. Thus, it finds various applications in mass storage, streaming of voice/video data, etc. Specifically in bulk transfer mode, the performance of transfer is taken into account with respect to the speed of transmission of data packets. This is counter complemented with other signals that are causative to affect the speed-performance of the protocol. This paper proposes an approach and methodology to analyze and characterize the performance of SuperSpeed Bulk Transfer Mode for IN and OUT transmission from device to host and host to device respectively. This discusses the different factors that contribute to deviate the speed from its theoretical value.