Smarttime is the libero soc gatelevel static timing analysis tool. Static timing analysis what is the longest delay in my circuit. Download static timing analysis for nanometer designs pdf. The input to an sta tool is the routed netlist, clock definitions or clock frequency and external environment definitions.
Graph modeling for static timing analysis at transistor. Bhasker rakesh chadha static timing analysis for nanometer designs a practical approach. Synopsys that is used to perform static timing analysis. A lineartime approach for static timing analysis covering all process corners sari onaissi, student member, ieee, and farid n. Having all of them in a single course makes it bulky. For a better and more detailed explanation, do yourself a favor and go see the original. Static timing analysis is a technique for estimating the delay of a design without electrical simulation. Many researches attempted to resolve the timing analysis, but the best method found till the moment is the static timing analysis sta. A fast approach for static timing analysis covering all pvt.
This lecture describes how static timing analysis is used to ensure timing constraints for a digital design are met. There is an amount of homework needed to make this tool. It involves computing the limits of delay of elements in the circuit without actually simulating it. Pdf static timing analysis for nanometer designs ebook. Although running a few corners, which are chosen beforehand, can lead to acceptable results in some cases, this is not always the case. Dynamic analysis is only performed on nets that are stimulated by applying vectors to a simulation model. 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. Static timing analysis checks every path in the design for timing violations without checking the functionality of the design. Static timing means setting the timing with the engine stopped.
Flat analysis provides the most accurate results, as it is completely transparent down to the logic cells, but it requires. Static timing analysis plays a vital role in facilitating the fast and reasonably accurate measurement of circuit timing. Quality of the dynamic timing analysis dta increases with the increase of input test. Graph modeling for static timing analysis at transistor level. Download static timing analysis for nanometer designs or read static timing analysis for nanometer designs online books in pdf, epub and mobi format. This book provides a blend of underlying theoretical background and indepth coverage of timing verification using static timing analysis. This way, one can do timing and functional analysis same time but separately.
So, coming to the question what are some of the best resources to l. So we decided to have it in 3 parts and this is part i essential timing checks. 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. It will then outline issues related to statistical static timing analysis ssta, a procedure that is becoming increasingly necessary to handle the complexities. The number of degrees varies from car to car again consult the handbook. Static timing analysis vs dynamic timing analysis static analysis is performed by calculating all possible delays between points of connectivity in a circuit. This is faster than dynamic timing simulation because there is no need to generate any kind of test vectors. This video will guide you through the most commonly asked interview questions related to the static timing analysis which is. Setup hold time of a flip flop why does a flip flop requires setup and hold time duration.
Static timing analysis for nanometer designs a practical. This chapter will overview the basics of static timing analysis. 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. Static timing analysis for nanometer designs pdf ebook php.
Do you have expertise in static timing analysis sta. Click download or read online button to get static timing analysis for nanometer designs book now. We have come across many design engineers trying to learn the background and various aspects of static timing analysis. Lecture notes analysis and design of digital integrated. Static timing analysis plays major role in physical designpd flow. 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. There are many causes of jitter including pll loop noise, power supply ripples, thermal noise, crosstalk between signals etc. This is faster than dynamic timing simulation because there is. 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. Difference between static timing analysis sta and dynamic timing analysis dta static timing analysis. In static timing analysis part 1 course, we introduced you to basic and essential timing checks, like cppr, gba, pba, etc.
Interconnects pdf download static timing analysis interview questions with answers pdf file 119 pages. 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. Currently, static timing analysis is performed flat or hierarchically, mostly depending on the size of the design. This video will guide you through the most commonly asked interview questions related to the static timing analysis which is the most commonly asked. 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. This chapter will first overview some of the most prominent techniques for static timing analysis sta. Let us elaborate the concept of clock jitter with the help of an example. The basic timing violations are setup violation and hold violation. This kind of analysis doesnt depend on any data or logic inputs, applied at the input pins. In this course, we are focusing on application of these concepts on real chip using opensource sta tool called opentimer. A practical approach is a reference for both beginners as well as professionals working in the area of static timing analysis for semiconductors.
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. Measuring the ability of a circuit to operate at the specified speed requires an ability to measure, during the. 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. Note if the content not found, you must refresh this page manually. Static timing analysis sta mainly divided into three kinds like timing checks, constraints, libraries as shown in fig. It is considered the best solution because of its accuracy and fast run time. 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. Please add your feedback in comments to make reading it a more meaningful. In this post, we will cover several examples covering setup and hold times and slack calculations.
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. Jan 20, 2012 setup hold time of a flip flop why does a flip flop requires setup and hold time duration. The book has originated from many years of our working in the area of timing verification for complex nanometer designs. What are some of the best resources to learn static timing. In sta, a combinational logic network is represented as a.
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. 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 has traditionally used the pert method for identifying the critical path of a digital circuit. Apr 03, 2009 this book addresses the timing verification using static timing analysis for nanometer designs.
A solution to the problem of accurately evaluating the design performance with variability is statistical static timing analysis ssta. It is widely adopted in industry for timing verification and optimization. It not only checks the design for required constraints that are governed by the. This section is heavily based on rob rutenbarsfrom logic to layout, lecture 12 from 20. So, clock jitter is of importance while talking about timing analysis. In this post, we have tried to list down all the posts that an sta engineer cannot do without. Static timing analysis or why and how to calculate slack. 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. Its the sta engineer who owns the timing closure of blocksoc. The benefits of static timing analysis based memory. Najm, fellow, ieee abstractmanufacturing process variations lead to circuit timing variability and a corresponding timing yield loss. Our results show that in the case of setup timing analysis, one can indeed bound circuit slacks across.
Due to the influence of the slope of a signal at a particular node on the. Static timing analysis sta is a technique of verifying our circuit meets timing constraints or not without having to simulate. The lecture notes for this course are closely based on the course textbook. 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. 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. Welcomei10 i10 welcome synopsys 34000000s16 primetime. 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. 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. For this, we have created separate posts for each example and listed the examples here so that it is convenient for readers to. 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. Static timing analysis interview questions with answers. Dynamic timing analysis dta and static timing analysis sta are not alternatives to each other.
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. 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 sta interview questions vlsi. Static timing analysis sta static timing analysis sta is one of the techniques to verify design in terms of timing. If you are a interviewer it will help you to extract more information in less time. A lineartime approach for static timing analysis covering. This book addresses the timing verification using static timing analysis for nanometer designs. A2a static timing analysis is one of the most interesting topics in vlsi. 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.
Traditional corner analysis consists of checking all process corners combina. As we know by now, static timing analysis involves mostly around analysis of timing paths and their setuphold slacks. This kind of analysis doesnot depend on any data or logic inputs, applied at the input pins. 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. One of the static timing analysis interview questions with answers pdf download 112 pages. And were going to explain in a while why its called static. Welcomei11 i11 welcome synopsys 34000000s16 primetime. This course will give an eagles eye to every timing check that is being performed in current industries for signoff.
1532 539 765 881 309 1339 1128 440 967 189 139 374 1225 870 475 687 794 884 1427 286 327 129 548 1447 1538 533 673 453 848 989 387 960 1028 921 1388 1276 134 1439 1077 105