Moreover, the fact that highlevel and logic synthesis operate on different internal models precludes onthefly interactions between these tools. Logic synthesis might in fact be used on a design after highlevel synthesis has been done, since it pmsup poses the sorts of decisions that highlevel synthesis makes. We study the synthesis of a gate level implementation from an rtl specification. Logic synthesis uses a standard cell library which have simple cells, such as basic logic gates like and, or, and nor, or macro. Chandan karfa department of computer science and engineering, iit guwahati. Logic synthesis uses a standard cell library which have simple cells, such as basic logic gates like and, or, and nor, or macro cells, such as adder, muxes, memory, and flipflops. Using highlevel synthesis, also known as esl synthesis, the allocation of work to clock cycles and across. Generation of distributed logicmemory architectures. Here is a detailed course descriptor lecture material.
Bridging the domains of highlevel and logic synthesis. Logic synthesis wikimili, the best wikipedia reader. A description is presented of the high level and logic synthesis stages in the digital design automation system diades. Electronic systemlevel esl design automation has been widely identi. Given a digital design at the registertransfer level, logic. Using a high level synthesis design methodology allows you. Highlevel synthesis synthesizes the c code as follows. Control logic extraction extracts the control logic to create a finite state machine fsm that sequences the operations in the rtl design. Computational boolean algebra, logic verification, and logic synthesis 2level and multilevel. This work presents the results obtained using a methodology that allows the hardware implementation and the rapid prototyping of communication protocols through logic and high level synthesis. Integration of logic synthesis and highlevel synthesis. In a second pass, the disjointness information provided by our analysis is used to split the synthesized heap memory into separate blocks and to split a loop into multiple loops so as to obtain a semantically equivalent parallel implementation.
Logic synthesis is a key component of digital design, as logic functions are often extracted from highlevel models, such as program ming e. Highlevel synthesis or hls represented an ambitious attempt by the community to provide capabilities for algorithms to gates for a period of almost three decades. We use xilinx vivado hls as an exemplary backend tool in our case studies. High level synthesis hls the process of converting a highlevel description of a design to a netlist input. Hardware designers can work at a higher level of abstraction while creating high performance hardware. In general, neither extreme is the optimal solution, necessitating the use of a manytomany mapping scheme. In electronics, logic synthesis is a process by which an abstract specification of desired circuit. High level synthesis synthesizes the c code as follows. We study the synthesis of a gatelevel implementation from an rtl specification. Diades performs system and high level synthesis of digital systems, as well as logic synthesis. Logic synthesis is rtl to gates, high level synthesis hls is one level of abstraction above. Toplevel function arguments synthesize into rtl io ports. Even once a high level of confidence that logic synthesis could produce logically. It also includes other steps such as technology mapping where the gates are selected from a set of libraries provided and timingareapower optimization.
The techniques in this book apply formal reasoning to highlevel synthesis in. Separation logic for highlevel synthesis december 2015 vol. Logic synthesis is the process that takes place in the transition from the registertransfer level to the transistor level. Pdf logic and high level synthesis for communication. It bridges the gap between highlevel synthesis and physical design automation. Logic synthesis for established and emerging computing epfl.
This paper presents a solution to these problems consisting of a novel internal model for synthesis which spans the domains of highlevel and logic synthesis. During the late 80s great progress was made in research and development, which has led to powerful commercial tools. Logic synthesis is the process of converting a highlevel description of design usually defined using a hardware description language into an optimized gatelevel representation. The conversion of a highlevel electronic circuit description into a list of logic gates and their interconnections, called the netlist. Adoption of highlevel synthesis automated tools for highlevel synthesis are not used widely low level structuring primitives e. Highlevel synthesis of functional patterns for recon. Logic synthesis is a process in which a program is used to automatically convert a highlevel textual representation of a design specified using an hdl at the register transfer level rtl of abstraction into equivalent registers and boolean equations. Logic synthesis follows immediately highlevel synthesis. Ab stract the vivado hls is based on the transformation of high level c language into a register transfer level implementation. These devices can often outperform cpus and gpus while consum.
Top level function arguments synthesize into rtl io ports. Highlevel synthesis creates an rtl implementation from c level source code extracts control and dataflow from the source code implements the design based on defaults and user applied directives many implementation are possible from the same source description smaller designs, faster designs, optimal designs enables design. The technical challenge in realizing this goal drew researchers from various areas ranging from parallel programming, digital signal processing, and logic synthesis to expert. Digital circuits implements the logic operations and, or, and not as hardware elements called gates that perform logic operations on binary inputs. Abraham hls 2 high level synthesis hls convert a highlevel description of a design to a rtl netlist input. Therefore the contents of the class is the following.
High level synthesis of distributed logic memory architectures chao huang y, srivaths ravi z, anand raghunathan, and niraj k. Logic synthesis is the process by which a behavioral or rtl design is transformed. Key findings high reliability we identified 5 common hro implementation strategies across 8 frameworks. Logic synthesis has been around for longer than hls. Separation logic for highlevel synthesis felix winterstein. A description is presented of the highlevel and logic synthesis stages in the digital design automation system diades. In electronics, logic synthesis is a process by which an abstract specification of desired circuit behavior, typically at register transfer level rtl, is turned into a design implementation in terms of logic gates, typically by a computer program called a.
The first one, as well as the entire system and the example of its application are discussed in the companion paper 221. Using highlevel synthesis, also known as esl synthesis, the allocation of work to clock cycles and across structural. Circuit partitioning for logic synthesis ieee xplore. Clive max maxfield, in bebop to the boolean boogie third edition, 2009. Vlsi design module 01 lecture 03 high level synthesis. Logic synthesis is the process of converting a highlevel description of design into an optimized gatelevel representation. This is driving, more than ever, the demand for higher design entry abstraction levels, such as the automatic circuit synthesis from highlevel languages highlevel synthesis.
Improved system performance for software designers software developers can accelerate the computationally intensive parts of their algorithms on a new compilation target, the fpga. Optimization techniques for digital vlsi design instructor. These hdls have also served as inputs to logic synthesis tools leading to the definition of their synthesizable subsets. Multilevel logic minimization factor function into smaller functions smaller gates fewer gates deeper circuit costperformance tradeoff needed for fpgas and semicustom asics circuit libraries with small gates developed in the 1980s and 90s much more difficult problem than 2level minimization. During the 1990s, the first generation of commercial highlevel synthesis hls tools was available commercially. Our goal is for students to understand how the tools themselves work, at the level of their fundamental algorithms and data structures. The shang highlevel synthesis framework, which is implemented as an llvm backend, take as input c specification and generates verilog rtl hardware desciption from llvm ir. Highlevel synthesis of distributed logicmemory architectures chao huang y, srivaths ravi z, anand raghunathan, and niraj k. This class teaches systematic design methods for new technologies. What is difference between logical synthesis and physical. This is the first step of the design chain, as we move from logic to layout.
Stratus highlevel synthesis cadence design systems enables global electronic design innovation and plays an essential role in the creation of todays electronics customers use cadence software, hardware, ip, and expertise to design. Its task is the mapping of rtl descriptions into gatelevel circuit representations. Highlevel synthesis tools a typical modern hardw are s ynthesis tool includes hls, logic synthesis, placement, and routing steps as shown in figure 9. High level synthesis data flow graphs fsm with data path allocation scheduling implementation directions in architectural synthesis ee 382v. The industrys leading highlevel synthesis platform with proven quality of results and 2550% reductions in verification cost.
Vlsi design module 03 lecture 10 high level synthesis. High level design, namely, data path synthesis, and control unit synthesis start from a parallel program graph, the form of. Logic synthesis creates a netlist of gates from rtl verilog. Huang et al generation of distributed logicmemory architectures by highlevel synthesis 1695 to a separate memory 11. As mentioned earlier, compilation, transformation, scheduling, and allocation are the main steps in the highlevel synthesis of synchronous, digital hardware from a sequential specification.
Given a digital design at the registertransfer level, logic synthesis transforms it into a gatelevel or transistorlevel implementation. Lecture 7 delays and timing in multilevel logic synthesis hai zhou ece 303 advanced digital design spring 2002 outline gate delays timing waveforms performance calculations staticdynamic hazards and glitches designs to avoid hazards reading. Highlevel synthesis of distributed logicmemory architectures. Diades performs system and highlevel synthesis of digital systems, as well as logic synthesis. The transformations at source code level allow us to stay as independent as possible of a speci. Logiclevel synthesis sometimes also called logic synthesis closes the gap between highlevel synthesis and conventional cad tools for physical design.
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