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SUMMARY 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 en- hanced. 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 ColumnAddress Strobe (CAS) latency unlike typical DDR DRAM interface scheme. The experi- mental results show that the proposed SSD maximally outperforms the tra- ditional SSD by 8.7 times in read mode, by 1.5 times in write mode. Also, for synthetic workloads, the proposed scheme shows performance improve- ment over the conventional architecture by a factor of 1.6 times.

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