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

The DERA 2nd generation NVMe SSD Controller “MENG”, which is designed for enterprise class and data center environments, achieves high reliability, high performance and big capacity features. The MENG controller supports NVM Express (NVMe) specification and customized protocol like open-channel. Built-in multi-core CPU and flexible NAND management interface, support mainstream domestic and international NAND flash. The MENG controller provides dual-channel DDR interface, delivers high I/O bandwidth with low latency.

Advanced LDCP ECC algorithm extends SSD endurance and uses less flash while ensure high data reliability, helps customer to reduce TCO (Total Cost of Ownership). Built-in multi-core CPU provide flexible choice which help developer to customize software to meet key-business requirement in enterprise and data center.

PCIe Gen3 x4

16 Nand channels

Up to 16TB capacity

Support mainstream NAND flash

Functional Features

NVMe 1.3 compliance, support PCIe Gen3 x4
Support NVMe optional command and vendor specific command, realize customized firmware
Support mainstream NAND flash, support both ONFI and TOGGLE
512GB-16TB total raw-capacity
16 NAND channels, 1.8V/1.2V VCCQ, 533MT/s I/O speed. Up to 16 NAND Dies per channel
Up to 3.4GB/s/ 3.3GB/s sequential read/ write bandwidth, up to 4KB random read 830K IOPS
2KB LDPC error correction algorithm
Dual channels 40bit DDR controller with ECC protection, up to 16GB DRAM
Support AES hardware encryption, support SM2/SM3/SM4
SPI NOR with ECC protection, multiple general interfaces: 5*UART, 2*I2C, 16*GPIO and 2*SPI
All internal RAM protected by ECC, whole end-to-end CRC data path protection

ECC and data integrity protection

The MENG controller's built-in LDPC ECC engines provide powerful error detection and correction ability, support hard-decoding and soft-decoding with 2KB code length, improve correction ability and ensure high reliability while increase data retention time and extend SSD endurance. Each NAND channel has its own ECC unit, ensure sustained low latency and high I/O bandwidth when multiple channels parallel accessing.

Besides NAND LDPC protection, the MENG controller also provides ECC protection to external DRAM and internal SRAM, and whole end-to-end CRC data path protection.

In some cases, NAND may occur uncorrectable error, especially when NAND going to the end of lifetime. To ensure data safety and keep high I/O performance, the MENG controller provides hardware RAID acceleration function. Under the control of firmware, multiple NAND Dies build adaptive RAID group, help to recover data base on other Dies' data within the RAID group when uncorrectable error occurs.

Design flexibility

The MENG controller provides flexible design options, so developer could customize software to reach the balance among cost, power and performance.

With target requirement and product definition, developer could make choice at NAND channel number/ capacity、DRAM channel number/ capacity、DRAM ECC on/ off、DRAM and/ or NAND interface, till getting an optimized solution.