Soft-Decoding in LDPC based Next-Generation SSD Controllers
Author: Stephen Bates
In my last post, I talked about how we can control the parameters of Low-Density Parity-Check (LDPC) error correction codes in order to manage the latency associated with reads from a Solid-State Drive (SSD). However, we only looked at the iterations associated with a single decode of the LDPC codeword. In this post, we will take a look at what happens when that initial decode fails and how soft-information can be used to recover the data on the SSD.