Unequal-error-protection codes in SRAMs for mobile multimedia applications

Xuebei Yang, K. Mohanram
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引用次数: 22

Abstract

In this paper, we introduce unequal-error-protection error correcting codes (UEPECCs) to improve SRAM reliability at low supply voltages for mobile multimedia applications. The fundamental premise for our work is that in multimedia applications, different bits in the same SRAM word are usually not equally significant, and hence deserve different protection levels. The key innovation in our work includes (i) a novel metric, word mean squared error, to measure the reliability of a SRAM word when different bits are not equally significant and (ii) an optimization algorithm based on dynamic programming to construct the UEPECC that assigns different protection levels to bits according to their significance. The advantage of the UEPECC over the traditional equal-error-protection ECC is demonstrated using two representative multimedia applications. For the same area, power, and encoding/decoding latency, SRAMs with UEPECC increase the peak signal-to-noise ratio by 8 dB in image processing and incur 60% less errors on average in optical flow (motion vector) computation.
移动多媒体应用中sram中的不等错误保护码
在本文中,我们引入不等错保护纠错码(UEPECCs)来提高移动多媒体应用中SRAM在低电源电压下的可靠性。我们工作的基本前提是,在多媒体应用中,同一个SRAM字中的不同位通常不是同等重要的,因此应该得到不同的保护级别。我们工作中的关键创新包括(i)一种新的度量,词均方误差,用于衡量不同位不同等重要时SRAM字的可靠性;(ii)一种基于动态规划的优化算法,用于构建UEPECC,该算法根据位的重要性为其分配不同的保护级别。通过两个典型的多媒体应用,验证了UEPECC相对于传统等错保护ECC的优势。对于相同的面积,功率和编码/解码延迟,具有UEPECC的sram在图像处理中将峰值信噪比提高了8 dB,并且在光流(运动矢量)计算中平均减少了60%的误差。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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