Pseudo-differential signaling scheme based on 4b/6b multiwire code

The majority of todaypsilas memory interfaces use single-ended signaling instead of differential signaling. Extending the performance of single-ended systems beyond a few Gb/s is a very challenging task mainly due to crosstalk and SSO noise. This paper presents a pseudo-differential signaling scheme based on an encoding technique which maps 4 bits of data to six coded bits with balanced numbers of 0s and 1s. The proposed scheme successfully removes the impact of SSO and VREF noise. The simulation results based on graphics memory channels show significant improvements in performance over the non-coded case.