Solid-State Disk with Double Data Rate DRAM Interface for High-Performance PCs

Dong KIM  Kwanhu BANG  Seung-Hwan HA  Chanik PARK  Sung Woo CHUNG  Eui-Young CHUNG  

IEICE TRANSACTIONS on Information and Systems   Vol.E92-D   No.4   pp.727-731
Publication Date: 2009/04/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E92.D.727
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Computer Systems
SSD (Solid-State Disk),  NAND flash,  North Bridge,  DRAM interface,  

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We propose a Solid-State Disk (SSD) with a Double Data Rate (DDR) DRAM interface for high-performance PCs. Traditional SSDs simply inherit the interface protocol of Hard Disk Drives (HDD) such as Parallel Advanced Technology Attachment (PATA) or Serial-ATA (SATA) for maintaining the compatibility. However, SSD itself provides much higher performance than HDD, hence the interface also needs to be enhanced. Unlike the traditional SSDs, the proposed SSD with DDR DRAM interface is placed in the North Bridge which provides two or more DDR DRAM interface ports in high-performance PCs. The novelty of our work is on DQS signaling scheme which allows arbitrary Column Address Strobe (CAS) latency unlike typical DDR DRAM interface scheme. The experimental results show that the proposed SSD maximally outperforms the traditional SSD by 8.7 times in read mode, by 1.5 times in write mode. Also, for synthetic workloads, the proposed scheme shows performance improvement over the conventional architecture by a factor of 1.6 times.