SSD controllers for TLC and 3-D NAND flash

Due to triple level cell (TLC) NAND flash offering higher capacity and lowest cost per MB of NAND flash, TLC is gaining popularity in the market of NAND flash storage. There are two vendors supplying SSD controllers for TLC NAND flash and also 3-D NAND flash: 1. Silicon Motion's SM2256, is a SATA 6Gb/s SSD controller solution supporting 1x/1y/1z nm triple-level cell (TLC) NAND from all major NAND suppliers. Silicon Motion' SM2256 also supports exclusively for Micron made 16nm 128 gigabit (Gb) TLC NAND flash memory chips. SM2256 is designed to support speeds of 540MB/s sequential read performance and 460MB/s sequential write, as well as up to 90,000 random read IOPS and 80,000 random write IOPS. SM2256 uses a technology called NANDXtend error-correcting code (ECC) technology to enhance the endurance and retention of TLC NAND, delivering more than three times better reliability for TLC SSD as compared to the existing BCH ECC schemes, says Silicon Motion. LDPC soft-decoding digital signal processing algorithm for error correction by voltage threshold tracking and on-chip RAID with page parity features are used for recovery of uncorrectable data in Silicon Motions' SSD controller chips. 2. To give you another SSD controller chip which was launched in the year 2014, Marvell had made available DRAM-less NVMe SSD Controller for mass market mobile computing based on i...