DERA 第二代蒙山“MENG”NVMe SSD 控制器定位于企业级及数据中心等应用场景

Product Introduction
Functional Features
ECC and data integrity protection
Design flexibility

Product Introduction

EMEI is the third generation NVMe SSD controller independently developed by DERA and it is also DERA's first enterprise-class controller that supports PCIe 4.0.

EMEI further optimizes the technical architecture while maintaining the high performance, high reliability and large capacity. The computing power of the built-in CPU is enhanced and more acceleration engines are provided on the data path to ensure industry-leading data processing capabilities. Designed using 12nm process technology, it further reduces chip size and power consumption.

The EMEI controller supports NAND flash from all major manufacturers and is compatible with NVMe 2.0 protocols, including ZNS (Zoned Namespace). It implements performance isolation technology to improve product performance while giving the product good design flexibility. EMEI integrates DERA's self-developed LDPC error correction algorithm, supports end-to-end data protection, and includes built-in AES and SM2/SM3/SM4 algorithm engines, ensuring superior reliability and ultra-high performance for the product.

Functional Features

NVMe 2.0 compliance, support PCle Gen 4.0X4/Dual port
Support NVMe optional command and vendor specific command, realize customized firmware
Support mainstream NAND flash, support both ONFI and TOGGLE
512GB-32TB total raw-capacity
16 NAND channels, 1.8V/1.2V VCCQ, 1200MT/s I/O speed. Up to 16 NAND Dies per channel
Up to 7GB/s/ 5GB/s sequential read/ write bandwidth, up to 1.5M IOPS of 4KB random read
Dual channels 40bit DDR controller with ECC protection, supports DDR4/ DDR3/ LPDDR4/ LPDDR3, up to 32GB DRAM
4KB code length LDPC error correction algorithm
All internal RAM protected by ECC, whole end-to-end CRC data path protection
Support ZNS, implement performance isolation technology, and support PMR features
SPI NOR with ECC protection, multiple general interfaces: 5*UART, 2*I2C, 16*GPIO and 2*SPI

ECC and data integrity protection

In addition to the basic ECC (Error-Correcting Code) function, the EMEI controller also provides complete protection for the internal data channel, including ECC protection through external DDR, built-in SRAM, and complete end-to-end CRC protection for data transmission. Furthermore, EMEI PI (Protection Information) technology is also applied to assist users in achieving end-to-end data integrity protection from applications to hard disks.

EMEI embeds DERA's self-developed adaptive flash memory error correction LDPC technology, which builds upon the existing 2K LDPC framework and achieves a breakthrough with a 4K code length LDPC error correction engine, greatly improving soft decoding and hard decoding capabilities. The improvement of LDPC decoding capabilities maximizes data reliability and extends the product life.

Design flexibility

Depending on the actual target requirements and product definitions, developers can flexibly choose among various options such as NAND channel number and capacity, DRAM channel and capacity, DRAM ECC switch, DRAM and/or NAND interface transfer rate, etc., to achieve an optimized combination.

EMEI controller provides flexible design options. Based on the EMEI controller, developers can achieve balanced design and product differentiation in several dimensions such as cost, power consumption, and performance.