Paper Title: Ultra MMI: an LDPC decoder that doubles throughput at end-of-life.

Paper Abstract: There are three main aspects regarding LDPC's capability: soft correction, error-floor and hard throughput. In 2017, SMI announce a low-power low-area 4K LDPC that greatly improves soft correction. Last year, a rigorous error-floor analysis is presented and proves the reliability of SMI's LDPC code beyond 10^-20 UBER order. This year, we go back to square one to talk about hard decoding. The presenting 4th generation green mode decoder includes a throughput boosting algorithm: Ultra MMI and a power saving algorithm: Zero. With the new algorithms, the 4th generation green mode prevents throughput degradation throughout the lift time of NAND products, and the power reduction brings more sustainability. The 4th generation green mode decoder is operating in the new SMI controllers.

Paper Author: Shiuan Hao Kuo, Supervisor Engineer, Silicon Motion

Author Bio: Shiuan-Hao Kuo is a supervisor engineer at Silicon Motion, where he focuses on algorithms of LDPC code. His recent work is SMI’s 4th generation hard green-mode decoding algorithm that doubles end-of-life throughput. He develops the low power/low area 4K-LDPC code and SMI’s low-power 3rd generation encoder. He is also in charge of several research projects including rate-compatible LDPC code design, error-floor behavior analysis and advanced object storage. He holds a PhD in error correction coding from National Taiwan University, Taiwan, and an MSEE from National Tsinghua University, Taiwan.