Exploiting Subarrays Inside a Bank to Improve Phase Change Memory Performance

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Provided by: edaa
Topic: Storage
Format: PDF
Enabling subarrays reduces memory latency by allowing concurrent accesses to different subarrays within the same bank in the DRAM system. However, this technology has great challenges in the PCM system since an on-going write cannot overlap with other accesses due to large electric current draw for writes. This paper proposes two new mechanisms (PASAK and WAVAK) that leverage subarray-level parallelism to enable a bank to serve a write and multiple reads in parallel without violating power constraints. PASAK exploits the electric current difference between writing a bit 0 and a bit 1, and provides a new power allocation strategy that better utilizes the power budget to mitigate the performance degradation due to bank conflicts.
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