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A Priority-Based 6T/8T Hybrid SRAM Architecture for Aggressive Voltage Scaling in Video Applications

A Priority-Based 6T/8T Hybrid SRAM Architecture for Aggressive Voltage Scaling in Video Applications,10.1109/TCSVT.2011.2105550,IEEE Transactions on C

A Priority-Based 6T/8T Hybrid SRAM Architecture for Aggressive Voltage Scaling in Video Applications  
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We present a voltage-scalable and process-variation resilient, hybrid memory architecture, suitable for use in MPEG- 4 video processors such that power dissipation can be traded for graceful degradation in "quality." The key innovation in our proposed work is a hybrid memory array, which is a mixture of conventional 6T and 8T SRAM bit-cells. The fundamental premise of our approach lies in the fact that the human visual system is mostly sensitive to higher order bits of luminance pixels in video data. We implemented a preferential storage policy in which the higher order luma bits are stored in robust 8T bit- cells while the lower order bits are stored in conventional 6T bit-cells. This facilitates aggressive scaling of supply voltage in memory as the important luma bits, stored in 8T bit-cells, remain relatively unaffected by voltage scaling. The not-so-important lower order luma bits, stored in 6T bit-cells, if affected, contribute insignificantly to the overall degradation in output video quality. Simulation results show that under iso-area condition, we can obtain at least 32% power savings in the hybrid memory array compared to the conventional 6T SRAM array.
Journal: IEEE Transactions on Circuits and Systems for Video Technology - TCSV , vol. 21, no. 2, pp. 101-112, 2011
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