High level logic synthesis pdf

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. Logic synthesis is rtl to gates, high level synthesis hls is one level of abstraction above. Pdf logic and high level synthesis for communication. This class teaches systematic design methods for new technologies. Chandan karfa department of computer science and engineering, iit guwahati. 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. Clive max maxfield, in bebop to the boolean boogie third edition, 2009. Given a digital design at the registertransfer level, logic synthesis transforms it into a gatelevel or transistorlevel implementation.

We use xilinx vivado hls as an exemplary backend tool in our case studies. Separation logic for highlevel synthesis december 2015 vol. 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. 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. High level design, namely, data path synthesis, and control unit synthesis start from a parallel program graph, the form of.

Logic synthesis is the process of converting a highlevel description of design usually defined using a hardware description language into an optimized gatelevel representation. 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. Huang et al generation of distributed logicmemory architectures by highlevel synthesis 1695 to a separate memory 11. Electronic systemlevel esl design automation has been widely identi. Logic synthesis is the process of converting a highlevel description of design into an optimized gatelevel representation. Hardware designers can work at a higher level of abstraction while creating high performance hardware. Our goal is for students to understand how the tools themselves work, at the level of their fundamental algorithms and data structures.

Logic synthesis is the process that takes place in the transition from the registertransfer level to the transistor level. Logic synthesis wikimili, the best wikipedia reader. High level synthesis data flow graphs fsm with data path allocation scheduling implementation directions in architectural synthesis ee 382v. High level synthesis hls the process of converting a highlevel description of a design to a netlist input. Ab stract the vivado hls is based on the transformation of high level c language into a register transfer level implementation. Given a digital design at the registertransfer level, logic. Toplevel function arguments synthesize into rtl io ports.

Diades performs system and high level synthesis of digital systems, as well as logic synthesis. During the late 80s great progress was made in research and development, which has led to powerful commercial tools. Vlsi design module 03 lecture 10 high level synthesis. Using a high level synthesis design methodology allows you. These hdls have also served as inputs to logic synthesis tools leading to the definition of their synthesizable subsets. What is difference between logical synthesis and physical. High level synthesis of distributed logic memory architectures chao huang y, srivaths ravi z, anand raghunathan, and niraj k. Top level function arguments synthesize into rtl io ports. Optimization techniques for digital vlsi design instructor. Moreover, the fact that highlevel and logic synthesis operate on different internal models precludes onthefly interactions between these tools. Logiclevel synthesis sometimes also called logic synthesis closes the gap between highlevel synthesis and conventional cad tools for physical design.

These devices can often outperform cpus and gpus while consum. 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. 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 conversion of a highlevel electronic circuit description into a list of logic gates and their interconnections, called the netlist. Logic synthesis follows immediately highlevel synthesis. Adoption of highlevel synthesis automated tools for highlevel synthesis are not used widely low level structuring primitives e. 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. 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. An example ofa 32 bit arithmetic logic unit alu in this paper has been accomplished using the hls tool.

The technical challenge in realizing this goal drew researchers from various areas ranging from parallel programming, digital signal processing, and logic synthesis to expert. Logic synthesis is the process by which a behavioral or rtl design is transformed. 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. Logic synthesis for established and emerging computing epfl. High level synthesis synthesizes the c code as follows. Abraham hls 2 high level synthesis hls convert a highlevel description of a design to a rtl netlist input. Highlevel synthesis tools a typical modern hardw are s ynthesis tool includes hls, logic synthesis, placement, and routing steps as shown in figure 9.

Key findings high reliability we identified 5 common hro implementation strategies across 8 frameworks. Using highlevel synthesis, also known as esl synthesis, the allocation of work to clock cycles and across structural. It also includes other steps such as technology mapping where the gates are selected from a set of libraries provided and timingareapower optimization. Digital circuits implements the logic operations and, or, and not as hardware elements called gates that perform logic operations on binary inputs. A description is presented of the highlevel and logic synthesis stages in the digital design automation system diades. Separation logic for highlevel synthesis felix winterstein. The techniques in this book apply formal reasoning to highlevel synthesis in. During the 1990s, the first generation of commercial highlevel synthesis hls tools was available commercially. Highlevel synthesis of distributed logicmemory architectures chao huang y, srivaths ravi z, anand raghunathan, and niraj k.

Circuit partitioning for logic synthesis ieee xplore. 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. In electronics, logic synthesis is a process by which an abstract specification of desired circuit. Highlevel synthesis of functional patterns for recon. Control logic extraction extracts the control logic to create a finite state machine fsm that sequences the operations in the rtl design. Vlsi design module 01 lecture 03 high level synthesis. Logic synthesis is a key component of digital design, as logic functions are often extracted from highlevel models, such as program ming e. We study the synthesis of a gate level implementation from an rtl specification. This is the first step of the design chain, as we move from logic to layout. In general, neither extreme is the optimal solution, necessitating the use of a manytomany mapping scheme. The industrys leading highlevel synthesis platform with proven quality of results and 2550% reductions in verification cost. The transformations at source code level allow us to stay as independent as possible of a speci. Generation of distributed logicmemory architectures. Bridging the domains of highlevel and logic synthesis.

Logic synthesis creates a netlist of gates from rtl verilog. 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. Using highlevel synthesis, also known as esl synthesis, the allocation of work to clock cycles and across. Therefore the contents of the class is the following. Its task is the mapping of rtl descriptions into gatelevel circuit representations. It bridges the gap between highlevel synthesis and physical design automation.

A description is presented of the high level and logic synthesis stages in the digital design automation system diades. Diades performs system and highlevel synthesis of digital systems, as well as logic synthesis. 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 has been around for longer than hls. We study the synthesis of a gatelevel implementation from an rtl specification. Highlevel synthesis of distributed logicmemory architectures. Logic synthesis uses a standard cell library which have simple cells, such as basic logic gates like and, or, and nor, or macro. The first one, as well as the entire system and the example of its application are discussed in the companion paper 221.