Post silicon validation is the final process in semiconductor chip manufacturing. Functional Validation (FV) is one among many methods used in post silicon validation. The aim of this process is to validate the functionality of the silicon prototype with respect to the functional specification given for the particular SoC (System on Chip) design. Thus by making sure the output product is free. This will lead to the mass manufacturing of the SoC Chips. In this paper we tried to explain how this post silicon functional validation is performed in the industry level. We also discussed about the various challenges, the industry is facing in terms of post silicon validation and the future research opportunities in this field. © IDOSI Publications, 2013.