Network on a chip (NoC) uses packet‐switched network to implement interconnections in System on chip (SoC). In SoC design, performance and energy efficiency are respectively the first and second priorities, and optimal on‐chip communication should decrease the power consumption and area overhead. In this work, a simplified BCH codec is proposed for reliable communication in NoC and SoC. It performs BCH error corrections without Berlekamp's algorithm, only using reduced syndrome bits to determine error patterns. The error locations can be found by looking up tables, by which the possible errors are directly corrected. Only one matrix product and one ROM access are required in the BCH decoder. The proposed (20, 8, 2) and (31, 16, 3) decoders in the paper can be easily applied for error corrections of interconnects and buses for NoC and SoC. It is also beneficial to correct data lines without length definition and control lines without storage.