Read e-book online Ultra-Low Energy Domain-Specific Instruction-Set Processors PDF

By Francky Catthoor, Praveen Raghavan, Andy Lambrechts, Murali Jayapala, Angeliki Kritikakou, Javed Absar

ISBN-10: 9048195276

ISBN-13: 9789048195275

Modern shoppers hold many digital units, like a cell phone, digicam, GPS, PDA and an MP3 participant. The performance of every of those units has passed through an immense evolution over fresh years, with a steep raise in either the variety of gains as within the caliber of the providers that they supply. even if, delivering the mandatory compute energy to help (an uncompromised mixture of) all this performance is very non-trivial. Designing processors that meet the difficult necessities of destiny cellular units calls for the optimization of the embedded method more often than not and of the embedded processors specifically, as they need to strike the right kind stability among flexibility, strength potency and function. commonly, a dressmaker will try and reduce the power intake (as some distance as wanted) for a given functionality, with a enough flexibility. in spite of the fact that, attaining this aim is already advanced whilst the processor in isolation, yet, in fact, the processor is a unmarried part in a extra advanced method. with a view to layout such complicated process effectively, severe judgements throughout the layout of every person part should still keep in mind influence at the different elements, with a transparent aim to maneuver to an international Pareto optimal within the entire multi-dimensional exploration space.

In the advanced, international layout of battery-operated embedded structures, the focal point of Ultra-Low power Domain-Specific Instruction-Set Processors is at the energy-aware structure exploration of domain-specific instruction-set processors and the co-optimization of the datapath structure, foreground reminiscence, and guide reminiscence organization with a hyperlink to the mandatory mapping thoughts or compiler steps on the early phases of the layout. via appearing an in depth strength breakdown test for an entire embedded platform, either power and function bottlenecks were pointed out, including the real kinfolk among the various elements. in response to this information, structure extensions are proposed for all of the bottlenecks.

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Extra resources for Ultra-Low Energy Domain-Specific Instruction-Set Processors

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In most embedded applications the data access pattern is more regular and can be analyzed. Therefore the movement of data can be more efficiently handled by the compiler or programmer and scratchpads are used (data memory without hardware support to move data around). g. in [VdW05]. A scratchpad based solution is power and performance efficient [Kan04a, Ban02], but it requires a DMA or Direct Memory Access, which is a separate datapath that needs be programmed to handle the required transfer. [Tal08, Mat03, Het02] present various architectural possibilities and their trade-offs for DMAs and Address Generation Units (AGUs) [Tal08].

However, these assumptions are made explicit and are motivated quantitatively during the analysis of the results. This discussion is instructive for understanding the relationship between the different parts of the platform and the conclusions that are drawn about the relative contribution of the parts to the total energy consumption. 34 A video platform case study In summary, the goal of this case study is to get insight into the relations between and the relative contributions of the platform components and less emphasis should be put on the absolute numbers.

G. 2 tot 4). This can potentially increase the maximal performance significantly. Many VLIWs provide a rather general instruction set and therefore are still quite flexible. g. wireless or media processing. Another class of VLIW style processors is organized as wide or hierarchical VLIW processors, which provides more flexibility than pure vector processors, as different operations can be executed in parallel [SilH, Mon05]. They form very heterogeneous VLIWs. Some VLIW processors however support only quite specific operations that improve the performance for a selected target application or application domain.

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Ultra-Low Energy Domain-Specific Instruction-Set Processors by Francky Catthoor, Praveen Raghavan, Andy Lambrechts, Murali Jayapala, Angeliki Kritikakou, Javed Absar

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