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Benjamin Allen
Benjamin Allen

Logic Synthesis And Verification Algorithms Pdf Free 11 _TOP_

Luca Gaetano Amaru is a Senior II, R&D Engineer at Synopsys Inc., Mountain View, CA. Formerly, he was a research assistant and PhD student in Computer Science at EPFL, Integrated Systems Laboratory, Lausanne, Switzerland, where he worked on new data structures and algorithms for logic synthesis and verification, under the direction of Prof. De Micheli, Dr. Gaillardon and Prof. Burg. He received his Bachelor's Degree in Electronic Engineering, with honors, from Politecnico di Torino, Italy, in 2009. In 2011 he received his double Master's Degree in Electronic Engineering, with honors, from Politecnico di Torino, Italy, and Politecnico di Milano, Italy. In 2014, he was a visiting researcher at Stanford University, Palo Alto, CA, USA.

logic synthesis and verification algorithms pdf free 11


In computer engineering, 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 synthesis tool. Common examples of this process include synthesis of designs specified in hardware description languages, including VHDL and Verilog.[1] Some synthesis tools generate bitstreams for programmable logic devices such as PALs or FPGAs, while others target the creation of ASICs. Logic synthesis is one aspect of electronic design automation.

The roots of logic synthesis can be traced to the treatment of logic by George Boole (1815 to 1864), in what is now termed Boolean algebra. In 1938, Claude Shannon showed that the two-valued Boolean algebra can describe the operation of switching circuits. In the early days, logic design involved manipulating the truth table representations as Karnaugh maps. The Karnaugh map-based minimization of logic is guided by a set of rules on how entries in the maps can be combined. A human designer can typically only work with Karnaugh maps containing up to four to six variables.

However, two-level logic circuits are of limited importance in a very-large-scale integration (VLSI) design; most designs use multiple levels of logic. As a matter of fact, almost any circuit representation in RTL or Behavioural Description is a multi-level representation. An early system that was used to design multilevel circuits was LSS from IBM. It used local transformations to simplify logic. Work on LSS and the Yorktown Silicon Compiler spurred rapid research progress in logic synthesis in the 1980s. Several universities contributed by making their research available to the public, most notably SIS from University of California, Berkeley, RASP from University of California, Los Angeles and BOLD from University of Colorado, Boulder. Within a decade, the technology migrated to commercial logic synthesis products offered by electronic design automation companies.

Logic design is a step in the standard design cycle in which the functional design of an electronic circuit is converted into the representation which captures logic operations, arithmetic operations, control flow, etc. A common output of this step is RTL description. Logic design is commonly followed by the circuit design step. In modern electronic design automation parts of the logical design may be automated using high-level synthesis tools based on the behavioral description of the circuit.[2]

With a goal of increasing designer productivity, research efforts on the synthesis of circuits specified at the behavioral level have led to the emergence of commercial solutions in 2004,[3] which are used for complex ASIC and FPGA design. These tools automatically synthesize circuits specified using high-level languages, like ANSI C/C++ or SystemC, to a register transfer level (RTL) specification, which can be used as input to a gate-level logic synthesis flow.[3] Using high-level synthesis, also known as ESL synthesis, the allocation of work to clock cycles and across structural components, such as floating-point ALUs, is done by the compiler using an optimisation procedure, whereas with RTL logic synthesis (even from behavioural Verilog or VHDL, where a thread of execution can make multiple reads and writes to a variable within a clock cycle) those allocation decisions have already been made.

Typical practical implementations of a logic function utilize a multi-level network of logic elements. Starting from an RTL description of a design, the synthesis tool constructs a corresponding multilevel Boolean network.

Abstract: Featured ApplicationThe presented implementation is aimed to deliver high performance logic controllers with very short and predictable response time. The controller is automatically synthesized from the delivered program given according to IEC61131-3 requirements. The user can concentrate on developing control algorithm while synthesis process to FPGA device is fully automatic. AbstractProgrammable logic controllers are commonly used in automation systems. Continuously growing demands result in the growth of control program complexity. The classic approach, based on programmatic serial-cyclic execution, results in an unacceptable extension of response time. To overcome long response time massive parallel program execution is proposed. It utilize direct in hardware program implementation in field programmable devices. The paper brings a formal method of representing control programs using flow graphs and enabling single cycle computations. The developed method accepts ladder diagrams (LD) and sequential function charts (SFC), according to IEC61131-3 standard requirements. It is capable of handling logic and arithmetic computations, enabling its hardware mapping. The intermediate form is optimized using flow graph representation and BDDs for analyzing logic dependencies. The BDD representation of logic dependencies enables direct mapping to lookup tables of a selected FPGA family. All the above steps deliver high-performance and direct hardware implementation of the control program given by standard languages. The controller response time is short, predictable, and independent from logic conditions during program execution.Keywords: FPGA; programmable logic controller; BDD; ladder diagram; SFC; high level synthesis; logic synthesis


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