By Antonio Carlos Schneider Beck, Carlos Arthur Lang Lisbôa, Luigi Carro
As embedded structures turn into extra advanced, designers face a couple of demanding situations at varied degrees: they should improve functionality, whereas maintaining power intake as little as attainable, they should reuse existent software program code, and even as they should reap the benefits of the additional good judgment on hand within the chip, represented via a number of processors operating jointly. This ebook describes numerous thoughts to accomplish such assorted and interrelated objectives, via adaptability. assurance contains reconfigurable platforms, dynamic optimization concepts corresponding to binary translation and hint reuse, new reminiscence architectures together with homogeneous and heterogeneous multiprocessor structures, conversation concerns and NOCs, fault tolerance opposed to fabrication defects and tender mistakes, and at last, how you can mix numerous of those innovations jointly to accomplish greater degrees of functionality and suppleness. The dialogue additionally contains easy methods to hire really good software program to enhance this new adaptive procedure, and the way this new type of software program needs to be designed and programmed.
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Extra info for Adaptable Embedded Systems
This step can be performed either by automated tools or manually by the designer. 2. Code transformation: Once the best candidate parts of the code to be accelerated (named as hot spots or kernels) are found, they need to be replaced by reconfigurable instructions. The reconfigurable instructions are handled by the control unit of the reconfigurable system. The source code of the processor can also be modified to explicitly communicate with the reconfigurable logic, by the use of native processor instructions.
Code Analysis: the first thing to do is to identify parts of the code that can be transformed for execution in the reconfigurable logic. The goal of this step is to find the best tradeoff considering performance and available resources regarding the reconfigurable unit (RU). Since it is hard to figure out (sometimes impossible) the most executed kernels by just analyzing the source or assembly code, usually an execution trace that was previously generated is analyzed, so dynamic information can be extracted.
Considering the code distribution, the main challenge is to find the best tradeoff between which pieces of code that should be executed in the reconfigurable logic and the ones that should stay with the GPP. The more code is executed in the reconfigurable logic the better, since it is executed in a more efficient manner. However, there is a cost associated to it: the need for extra area and memory, which are obviously limited resources. Systems provided of reconfigurable logic are often called Reconfigurable Instruction Set Processors (RISP) .
Adaptable Embedded Systems by Antonio Carlos Schneider Beck, Carlos Arthur Lang Lisbôa, Luigi Carro