Smarttime is the libero soc gatelevel static timing analysis tool. What are some of the best resources to learn static timing. Apr 03, 2009 this book addresses the timing verification using static timing analysis for nanometer designs. Flat analysis provides the most accurate results, as it is completely transparent down to. In this post, we have tried to list down all the posts that an sta engineer cannot do without. A solution to the problem of accurately evaluating the design performance with variability is statistical static timing analysis ssta. 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.
This kind of analysis doesnt depend on any data or logic inputs, applied at the input pins. This section is heavily based on rob rutenbarsfrom logic to layout, lecture 12 from 20. Traditional corner analysis consists of checking all process corners combina. Prepare well for the job interviews with our static timing analysis sta job interview questions and answers for better career growth. Dynamic timing analysis dta and static timing analysis sta are not alternatives to each other. It is widely adopted in industry for timing verification and optimization. Measuring the ability of a circuit to operate at the specified speed requires an ability to measure, during the. Static timing analysis sta is a technique of verifying our circuit meets timing constraints or not without having to simulate. As we know by now, static timing analysis involves mostly around analysis of timing paths and their setuphold slacks. Welcomei10 i10 welcome synopsys 34000000s16 primetime. Rabaey, jan, anantha chandrakasan, and bora nikolic. This way, one can do timing and functional analysis same time but separately. 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. 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.
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. Note if the content not found, you must refresh this page manually. Other delay budgeting techniques are described in 8. Please add your feedback in comments to make reading it a more meaningful. 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. 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. Jan 20, 2012 setup hold time of a flip flop why does a flip flop requires setup and hold time duration. We have come across many design engineers trying to learn the background and various aspects of static timing analysis. Let us elaborate the concept of clock jitter with the help of an example.
The benefits of static timing analysis based memory. This video will guide you through the most commonly asked interview questions related to the static timing analysis which is the most commonly asked. 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. 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. If you are a interviewer it will help you to extract more information in less time. Currently, static timing analysis is performed flat or hierarchically, mostly depending on the size of the design. Due to the influence of the slope of a signal at a particular node on the.
For a better and more detailed explanation, do yourself a favor and go see the original. This video will guide you through the most commonly asked interview questions related to the static timing analysis which is. This book addresses the timing verification using static timing analysis for nanometer designs. 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. Graph modeling for static timing analysis at transistor level. So we decided to have it in 3 parts and this is part i essential timing checks.
This course will give an eagles eye to every timing check that is being performed in current industries for signoff. Many researches attempted to resolve the timing analysis, but the best method found till the moment is the static timing analysis sta. Its the sta engineer who owns the timing closure of blocksoc. The lecture notes for this course are closely based on the course textbook. It will then outline issues related to statistical static timing analysis ssta, a procedure that is becoming increasingly necessary to handle the complexities. This chapter will overview the basics of static timing analysis. Static timing analysis comprises broadly for timing checks, constraints and library. This chapter will first overview some of the most prominent techniques for static timing analysis sta. Static timing analysis is a technique for estimating the delay of a design without electrical simulation.
A lineartime approach for static timing analysis covering. This is faster than dynamic timing simulation because there is. For this, we have created separate posts for each example and listed the examples here so that it is convenient for readers to. A lineartime approach for static timing analysis covering all process corners sari onaissi, student member, ieee, and farid n. 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. Graph modeling for static timing analysis at transistor.
Static timing analysis vs dynamic timing analysis static analysis is performed by calculating all possible delays between points of connectivity in a circuit. Static timing analysis sta is a vast domain involving many subfields. 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. Download static timing analysis for nanometer designs pdf. Static timing analysis for nanometer designs pdf ebook php. Do you have expertise in static timing analysis sta. In this post, we will cover several examples covering setup and hold times and slack calculations. Static timing analysis what is the longest delay in my circuit. This lecture describes how static timing analysis is used to ensure timing constraints for a digital design are met. Difference between static timing analysis sta and dynamic timing analysis dta static timing analysis. There are many causes of jitter including pll loop noise, power supply ripples, thermal noise, crosstalk between signals etc. 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. Najm, fellow, ieee abstractmanufacturing process variations lead to circuit timing variability and a corresponding timing yield loss. It not only checks the design for required constraints that are governed by the.
Our results show that in the case of setup timing analysis, one can indeed bound circuit slacks across. A2a static timing analysis is one of the most interesting topics in vlsi. This kind of analysis doesnot depend on any data or logic inputs, applied at the input pins. Synopsys that is used to perform static timing analysis. 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. Interconnects pdf download static timing analysis interview questions with answers pdf file 119 pages. The input to an sta tool is the routed netlist, clock definitions or clock frequency and external environment definitions. There is an amount of homework needed to make this tool. Static timing analysis sta interview questions vlsi. 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. The book has originated from many years of our working in the area of timing verification for complex nanometer designs. Dynamic analysis is only performed on nets that are stimulated by applying vectors to a simulation model. In static timing analysis part 1 course, we introduced you to basic and essential timing checks, like cppr, gba, pba, etc. Pdf static timing analysis for nanometer designs ebook.
Static timing analysis and timing violations of sequential. This book provides a blend of underlying theoretical background and indepth coverage of timing verification using static timing analysis. Welcomei11 i11 welcome synopsys 34000000s16 primetime. Static timing analysis has traditionally used the pert method for identifying the critical path of a digital circuit. 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. So, coming to the question what are some of the best resources to l. 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. 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 or why and how to calculate slack. 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. In this course, we are focusing on application of these concepts on real chip using opensource sta tool called opentimer.
Static timing analysis interview questions with answers. 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. The basic timing violations are setup violation and hold violation. A fast approach for static timing analysis covering all pvt. Static timing analysis sta static timing analysis sta is one of the techniques to verify design in terms of timing. Having all of them in a single course makes it bulky. 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. Download static timing analysis for nanometer designs or read static timing analysis for nanometer designs online books in pdf, epub and mobi format. It involves computing the limits of delay of elements in the circuit without actually simulating it. Click download or read online button to get static timing analysis for nanometer designs book now. This is faster than dynamic timing simulation because there is no need to generate any kind of test vectors.
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. Bhasker rakesh chadha static timing analysis for nanometer designs a practical approach. And were going to explain in a while why its called static. Static timing analysis checks every path in the design for timing violations without checking the functionality of the design. Day one day 1 unit register to register paths lab 3 reading data 4 constraining internal regreg paths 2 writing basic tcl constructs in pt 1 introduction to static timing analysis. Flat analysis provides the most accurate results, as it is completely transparent down to the logic cells, but it requires.
Static timing analysis plays major role in physical designpd flow. In sta, a combinational logic network is represented as a. It is considered the best solution because of its accuracy and fast run time. 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. Static timing analysis for nanometer designs a practical. 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 number of degrees varies from car to car again consult the handbook.
So, clock jitter is of importance while talking about timing analysis. Static timing analysis sta mainly divided into three kinds like timing checks, constraints, libraries as shown in fig. Setup hold time of a flip flop why does a flip flop requires setup and hold time duration. Quality of the dynamic timing analysis dta increases with the increase of input test. Although running a few corners, which are chosen beforehand, can lead to acceptable results in some cases, this is not always the case. Static timing means setting the timing with the engine stopped. One of the static timing analysis interview questions with answers pdf download 112 pages.
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