Hamming codes are widely used for the single bit error correction double bit error detection (SEC-DED) which occurred during data transmission process. This paper presents an enhanced detection of double adjacent bit errors and correcting all possible single bit errors in Hamming codes through selective bit placement technique for memory application. Soft errors occur due to the radiation particles which affects the memory elements. These soft errors cause flipping of single bit or more often adjacent bits in the memory. Proposed technique improves the probability of detecting double adjacent bit errors and also provides a simple method of detecting double adjacent bit errors as compared to convolution coding through interleaving which is complex and requires higher memory. Hamming (12, 8) is implemented on hardware using RL 78 (G13) Microcontroller.

1. R. W. Hamming, "Error detecting and error correcting codes," Bell Syst. Tech. J. , vol. 29, no. 2, pp. 147–160, Apr. 1950.
2. R. C. Baumann, "Radiation-induced soft errors in advanced semiconductor technologies," IEEE Trans. Device Mater. Rel. , vol. 5, no. 3, pp. 301–316, Sep. 2005
3. R. C. Baumann, "Soft errors in advanced semiconductor devices - part I: the three radiation sources," IEEE Trans. Nucl. Sci. , vol. 1, no. 1, pp. 17–22, Mar. 2001.
4. L. Lantz, "Soft errors induced by alpha particles," IEEE Trans. Reliab. , vol. 45, no. 2, pp. 174–179, Dec. 1996.
5. S. Lin and D. J. Costello, Error Control Coding, 2nd ed. Englewood Cliffs, NJ: Prentice-Hall, 2004.
6. P C Gupta, Data communication and networking, 2nd edition PHI Learning Pvt. Ltd. , 02-Nov-2013
7. Alfonso Sanchez - Macian "Enhanced detection of double and triple adjacent errors in hamming codes through selective bit placement" IEEE Transactions on device and materials, vol. 12, no. 2, pp. 357– 362, Jun. 2012.
8. RL78-Microcontroller http://documentation. renesas. com/doc/products/mpumcu/doc/rl78/r01ds0131ej0310_rl78g13. pdf

Hamming Code Sec-ded Soft Error.