Serial Bus Encoding for Low Power Application

In this paper, we propose a low-power encoding scheme for serial buses (LESB) which can be used in SoCs. The scheme makes use of a look-up-table for encoding the input data before the parallel to serial conversion and a look-up-table after serial to parallel conversion in the decoder. Using the look-up table, the input symbols are replaced with some codewords which have some redundant bits compared to the original symbols. The serial transmission of the codewords leads to lower switching (transition) activity compared to that of the original transmission of the input symbols. The simulation results show that the when one redundant bit is used, the proposed scheme reduces the transition (switching) activity on the serial bus for uniform data more than 18% with a reduction of 11% in the throughput. More power reduction may be achieved by adding more redundant bits to original input symbols