High-level synthesis - also called behavioral and architectural-level synthesis - is a key design technology to realize systems on chip/package of various kinds, whether single or multi-processors, homogeneousor heterogeneous,for the emb- ded systems market or not. Actually, as technology progresses and systems become increasingly complex, the use of high-level abstractions and synthesis methods becomes more and more a necessity. Indeed, the productivityof designers increases with the abstraction level, as demonstrated by practices in both the software and hardware domains. The use of high-level models allows designers with systems, rather than circuit, backgroundto be productive,thus matching the trend of industry whichisdeliveringanincreasinglylargernumberofintegratedsystemsascompared to integrated circuits. The potentials of high-level synthesis relate to leaving implementation details to the design algorithms and tools, including the ability to determine the precise timing of operations, data transfers, and storage. High-level optimization, coupled with high-levelsynthesis, canprovidedesignerswith the optimalconcurrencystr- ture for a data ow and corresponding technological constraints, thus providing the balancing act in the trade-offbetween latency and resource usage. For complex s- tems, the design space exploration,i.e., the systematic search for the Pareto-optimal points, can only be done by automated high-level synthesis and optimization tools. Nevertheless, high-level synthesis has been showing a long gestation period. Despite early resultsin the 1980s,it is still not commonpracticein hardwaredesign.
The successful usage of Hardware Description Languages like VHDL and Verilog in design flows is mainly due to the availability of efficient synthesis methods and tools that enable the translation of RTL designs into optimized gate-level implementations. Many expect that the same approach could be effectively adapted at higher levels of abstraction. In the SoCs context, the traditional IC design methodology relying on EDA tools used in a two stages design flow - a VHDL/Verilog RTL specification, followed by logical and physical synthesis - is indeed no more suitable. Thus, actual complex SoCs need new ESL level tools in order to raise the specification abstraction level up to the algorithmic / behavioral one. However, in order to provide the designers with an efficient automated path to implementation, new high-level synthesis tools and approaches are required.
The main expectations from the system design teams concern both methods and tools supporting better management of the design complexity and reduction of the design cycle all together, breaking the trend to compromise evaluation of various design implementation options. Designing at higher levels of abstraction is an obvious way as it allows a better coping with the system design complexity, to verify earlier in the design process and to increase code reuse.
This book presents an excellent collection of contributions addressing different aspects of high-level synthesis from both industry and academia. High-Level Synthesis: from Algorithm to Digital Circuit should be on each designer's and CAD developer's shelf, as well as on those of project managers who will soon embrace high level design and synthesis for all aspects of digital system design.
