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Synthèse de haut-niveau de contrôleurs ultra-faible consommation ...

Synthèse de haut-niveau de contrôleurs ultra-faible consommation ...

tel-00553143, version 1

tel-00553143, version 1 - 6 Jan 2011 136 Experimental setup and results Figure 6.7: Comparison of power, area and energy consumption for 8-bit and 16-bit micro-tasks.

tel-00553143, version 1 - 6 Jan 2011 Effects of low duty-cycle and overall energy gain 137 Power Pact MSP = 8.8 mW Ton MSP = 1µs Toff MSP = 1µs Tact MSP = 31.6 µs Tperiod = 100 ms Tstby MSP = 99.96 ms Pact MT = 33.34 µW Ton MT = 38 ns Toff MT = 450 ns Tact MT = Tslp MT = 99.957 42 µs ms Tperiod = 100 ms time Figure 6.8: Time distribution of sendFrame task duty cycle. 6.5.2 Static power and area overhead As far as the static power consumption of the synthesized SM is concerned, it consumes approximately 600 nW of static power when implemented with standard cell library. It is worth-noticing that the major part of this static power is consumed due to the various 1-bit flip-flops present in the SM. For the sake of exploration, we experimented with different available cell libraries (e.g. general purpose, low-power etc.) and different levels of VDD. We found out that even using the standard cell libraries and just by lowering the VDD to 0.3 V (the minimum voltage for data retention), the static power consumption of the SM can be reduced to approximately 150 nW whereas the static power consumption of the MSP430 is around 1.54 µW (from the datasheets). Similarly, if we look at the area overhead of the hardware SM used in our casestudy example, it is only 1710 µm 2 that corresponds to only 2% of area consumed by an openMSP-core synthesized for the same process technology. Looking at these power and area results, obtained for the hardware SM, it is quite evident that for an area overhead of only 2%, we are gaining approximately 10x in terms of static power consumption whereas the dynamic power consumption of the hardware SM is negligible as compared to an equivalent OS-based software implementation. However, we must take into account the static power consumption of the power-gated hardware micro-tasks present in the system. The effects of static power consumption of a hardware micro-task on the overall energy gain during a micro-task activation is discussed in the next section.

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