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Coding for Write Latency Reduction in a Multi-Level Cell (MLC) Phase Change Memory (PCM)
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DOI：10.1109/TC.2018.2868928.png)
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This paper presents a new write latency reduction scheme for a Phase Change Memory (PCM) made of Multi-Level Cells (MLCs). This scheme improves over an existing scheme found in the technical literature and known as CABS. The proposed scheme is based on the utilization of a new coding arrangement for the selection of candidate codewords. The code relies on the two-step feature found in the write operation of a MLC PCM and avoids the symbol that incurs in the largest latency at a higher rate than CABS. A detailed simulation based evaluation and comparison are also pursued; the proposed scheme accomplishes improvements in write latency (for parallel writing) as well as coding rate (16/17 for the proposed scheme versus 16/18 for CABS for 16 symbols or 32-bit word). As the proposed scheme utilizes novel selection criteria for the candidates, the design of the required circuitry (encoder and decoder) has also been changed with respect to CABS; in terms of hardware, the areas of the encoder and decoder for the proposed scheme are reduced by 73 and 56 percent respectively compared with CABS.
Keyword:
Phase change memory (PCM)
multi-level cell (MLC)
write time reduction
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