Measuring the ability of a circuit to operate at the specified speed requires an ability to measure, during the. Static timing analysis sta mainly divided into three kinds like timing checks, constraints, libraries as shown in fig. Welcomei11 i11 welcome synopsys 34000000s16 primetime. Dynamic analysis is only performed on nets that are stimulated by applying vectors to a simulation model.
Lattice semiconductor trace program difficult to cover all paths 9checks every path for timing violations simple timing checks 9minmax, clock skew, exceptions supports asynchronous designs 9synchronous designs only confirms function and timing 9confirms timing only. Static timing analysis plays major role in physical designpd flow. This video will guide you through the most commonly asked interview questions related to the static timing analysis which is. For a better and more detailed explanation, do yourself a favor and go see the original. Static timing analysis checks every path in the design for timing violations without checking the functionality of the design. Flat analysis provides the most accurate results, as it is completely transparent down to the logic cells, but it requires. Static timing analysis interview questions with answers. This book provides a blend of underlying theoretical background and indepth coverage of timing verification using static timing analysis. This chapter will overview the basics of static timing analysis. The benefits of static timing analysis based memory. This way, one can do timing and functional analysis same time but separately. So, clock jitter is of importance while talking about timing analysis.
Click download or read online button to get static timing analysis for nanometer designs book now. The number of degrees varies from car to car again consult the handbook. For this, we have created separate posts for each example and listed the examples here so that it is convenient for readers to. Well, were going to talk about the logic side of this and so were going to do some thing thats very important which is called static timing analysis. In this course, we are focusing on application of these concepts on real chip using opensource sta tool called opentimer. Static timing analysis for nanometer designs a practical. Bhasker rakesh chadha static timing analysis for nanometer designs a practical approach. This course will give an eagles eye to every timing check that is being performed in current industries for signoff. So we decided to have it in 3 parts and this is part i essential timing checks. Static timing analysis is a technique of analysing timing paths in a digital logic by adding up delays along a timing path both gate and interconnect and comparing it with constraints clock period to check whether the path meets the constraint. It checks the design whether it is working properly at specified operating frequency by checking the timing constraints predefined by vendor tool are meeting by the all timing paths across design. Download static timing analysis for nanometer designs or read static timing analysis for nanometer designs online books in pdf, epub and mobi format. Currently, static timing analysis is performed flat or hierarchically, mostly depending on the size of the design.
Static timing means setting the timing with the engine stopped. The speedup appears due to the use of simplified delay models, and on account of the fact that its ability to consider the effects of logical interactions between signals is limited. Its the sta engineer who owns the timing closure of blocksoc. Static timing analysis sta is a vast domain involving many subfields. The book has originated from many years of our working in the area of timing verification for complex nanometer designs. Static timing analysis in circuit graphs, static timing analysissta refers to the problem of finding the delays from the input pins of the circuit esp. If you are a interviewer it will help you to extract more information in less time. A2a static timing analysis is one of the most interesting topics in vlsi. Interconnects pdf download static timing analysis interview questions with answers pdf file 119 pages.
Jan 20, 2012 setup hold time of a flip flop why does a flip flop requires setup and hold time duration. In static timing analysis part 1 course, we introduced you to basic and essential timing checks, like cppr, gba, pba, etc. Standard analysis latches asynchronous circuits static timing analysis wileyieee press books ieee websites place cookies on your device to give you the best user experience. The basic timing violations are setup violation and hold violation. This is faster than dynamic timing simulation because there is no need to generate any kind of test vectors. Traditional corner analysis consists of checking all process corners combina. Static timing analysis and timing violations of sequential. Day two day 2 unit io paths and exceptions lab 7 introduction to timing models qtm 8 6 specifying timing exceptions 5 constraining io interface paths 9 summary performing sta 10. So, coming to the question what are some of the best resources to l.
Due to the influence of the slope of a signal at a particular node on the. A practical approach is a reference for both beginners as well as professionals working in the area of static timing analysis for semiconductors. Static timing analysis sta interview questions vlsi. Prepare well for the job interviews with our static timing analysis sta job interview questions and answers for better career growth. As we know by now, static timing analysis involves mostly around analysis of timing paths and their setuphold slacks. Other delay budgeting techniques are described in 8. Static timing analysis timing constraints path delay between two flipflops must be less than one clock period once clock specification is fixed, timing constraint is fixed between all flip flops 5.
The timing of the spark is measured as the number of degrees by which the crankshaft is short of bringing the piston in the timing cylinder usually no. The benefits of static timing analysis based memory characterization 2 with the traditional approach, given a specific scenario of input and clock transitions, a dynamic simulator such as spice or fastspice is commonly used to determine if a particular sensitization leads to a timing violation in the circuit block. Static timing analysis comprises broadly for timing checks, constraints and library. Flat analysis provides the most accurate results, as it is completely transparent down to.
Do you have expertise in static timing analysis sta. In sta, a combinational logic network is represented as a. This kind of analysis doesnt depend on any data or logic inputs, applied at the input pins. Many researches attempted to resolve the timing analysis, but the best method found till the moment is the static timing analysis sta. Difference between static timing analysis sta and dynamic timing analysis dta static timing analysis. Lecture notes analysis and design of digital integrated.
Static timing analysis plays a vital role in facilitating the fast and reasonably accurate measurement of circuit timing. Najm, fellow, ieee abstractmanufacturing process variations lead to circuit timing variability and a corresponding timing yield loss. Graph modeling for static timing analysis at transistor. Slack analysis is used to identify timing critical paths in a design by the static timing analysis tool critical path any logical path in the design that violates the timing constraints path with a negative slack slack analysis data path types slack analysis data path types primary inputtoregister paths delays offchip. If youre looking for a free download links of static timing analysis for nanometer designs pdf, epub, docx and torrent then this site is not for you.
Having all of them in a single course makes it bulky. There is an amount of homework needed to make this tool. Smarttime is the libero soc gatelevel static timing analysis tool. This is faster than dynamic timing simulation because there is. We have come across many design engineers trying to learn the background and various aspects of static timing analysis. Graph modeling for static timing analysis at transistor level. In this post, we have tried to list down all the posts that an sta engineer cannot do without.
If you are expert in constraints creation, cdc checks, logicalphysical synthesis, formal verification and prepost layout timing closure then many jobs are available in sta functional roles. Static timing analysis what is the longest delay in my circuit. It not only checks the design for required constraints that are governed by the. This kind of analysis doesnot depend on any data or logic inputs, applied at the input pins. A fast approach for static timing analysis covering all pvt. Static timing analysis for nanometer designs pdf ebook php. Welcomei10 i10 welcome synopsys 34000000s16 primetime. This book addresses the timing verification using static timing analysis for nanometer designs. A static timing analysis sta utility will be run to calculate all of the inputtooutput and internal path delays and also to check for any timing violations setup, hold. A lineartime approach for static timing analysis covering all process corners sari onaissi, student member, ieee, and farid n. Static timing analysis sta is a simulation method of computing the expected timing of a digital circuit without requiring a simulation of the full circuit highperformance integrated circuits have traditionally been characterized by the clock frequency at which they operate. One of the static timing analysis interview questions with answers pdf download 112 pages. However, they only use static timing analysis reports in the form of standard delay format for pathlength calculation and neglect important underlying causes, such as process variations.
Its not recommended to write down the questions which you would ask in the interview but this book can help to understand what all different questions can be asked related to static timing analysis. Dynamic timing analysis dta and static timing analysis sta are not alternatives to each other. With smarttime, you can perform complete timing analysis of your design to ensure that you meet all timing constraints and that your design operates at the desired speed with the right amount of margin across all operating conditions. In this post, we will cover several examples covering setup and hold times and slack calculations. There are many causes of jitter including pll loop noise, power supply ripples, thermal noise, crosstalk between signals etc. Note if the content not found, you must refresh this page manually. This chapter will first overview some of the most prominent techniques for static timing analysis sta. Static timing analysis or why and how to calculate slack. It will then outline issues related to statistical static timing analysis ssta, a procedure that is becoming increasingly necessary to handle the complexities. Download static timing analysis for nanometer designs pdf.
Although running a few corners, which are chosen beforehand, can lead to acceptable results in some cases, this is not always the case. And were going to explain in a while why its called static. The input to an sta tool is the routed netlist, clock definitions or clock frequency and external environment definitions. Static timing analysis is a technique for estimating the delay of a design without electrical simulation. Static timing analysis sta is a technique of verifying our circuit meets timing constraints or not without having to simulate. What are some of the best resources to learn static timing. It is considered the best solution because of its accuracy and fast run time. This lecture describes how static timing analysis is used to ensure timing constraints for a digital design are met. This video will guide you through the most commonly asked interview questions related to the static timing analysis which is the most commonly asked. Synopsys that is used to perform static timing analysis. It is widely adopted in industry for timing verification and optimization. Our results show that in the case of setup timing analysis, one can indeed bound circuit slacks across.
Apr 03, 2009 this book addresses the timing verification using static timing analysis for nanometer designs. Slack analysis is used to identify timing critical paths in a design by the static timing analysis tool critical path any logical path in the design that violates the timing constraints path with a negative slack slack analysis data path types slack analysis data path types. Dynamic timing analysis has to be accomplished and functionality of the design must be cleared before the design is subjected to static timing analysis sta. The lecture notes for this course are closely based on the course textbook. Quality of the dynamic timing analysis dta increases with the increase of input test. Precharge logic is used by a variety of industries in applications where processor speed is the primary goal, such as vlsi very large systems integration applications. A lineartime approach for static timing analysis covering. Pdf static timing analysis for nanometer designs ebook. This section is heavily based on rob rutenbarsfrom logic to layout, lecture 12 from 20. It involves computing the limits of delay of elements in the circuit without actually simulating it. Static timing analysis has traditionally used the pert method for identifying the critical path of a digital circuit. Static timing analysis vs dynamic timing analysis static analysis is performed by calculating all possible delays between points of connectivity in a circuit. A solution to the problem of accurately evaluating the design performance with variability is statistical static timing analysis ssta. Static timing analysis sta static timing analysis sta is one of the techniques to verify design in terms of timing.
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