Ocv timing analysis software

Primetime hyperscale technology enables hierarchical sta by performing accurate block level timing analysis in the context of the toplevel. This community should serve as a resource to ask and answer questions related to static timing analysis, methodology for better use. Hi, in lastest designs,at advanced nodes we do mcmm analysis and also do ocv analysis. Onchip variation ocv for timing closure guide tech design forum. Timing analysis of realtime software is not a designers handbook. Onchip variation ocv is a recognition of the intrinsic variability of semiconductor processes and their impact on factors such as logic timing.

Begin with clockbased analysis a clock networkonly analysis can simplify the adoption of advanced ocv. Magma unveils tekton first static timing analysis solution. Ocv mode optimization in encounter digital implementation. A statistical onchip variation approach to timing analysis permits the automated or semiautomated selection of designspecific margins without requiring complex statistical libraries. We show that to achieve correct and accurate timing estimates in modeldriven embedded software design, both modellevel and. Static timing analysis sta has been around more than 30 years. Timing solution models are based on classical cyclical analysis. Closing timing can be one of the most difficult and timeconsuming aspects of creating an fpga design. Advanced ocv this is also called location aware ocv in this we apply derating values on the cellsnets based on the logic depth from the common fanout point of. Generally, it is modeled using a simple derate number for data. The fundamental idea behind ocv is to apply global derates on the whole.

The system 100b includes a statistical static timing analysis software tool 140. The focus is on the use of modelling techniques based on the socalled quirkmodel, initially developed in the united kingdom and, over the past decade, extensively developed in institutions in. So we decided to have it in 3 parts and this is part i essential timing checks. But as the technology is shrinking, there are onchip variation ocv, signalintegrity, and other uncertainty factors that come into the picture. Top 4 download periodically updates software information of timing full versions from the publishers, but some information may be slightly outofdate using warez version, crack, warez passwords, patches, serial numbers, registration codes, key generator, pirate key, keymaker or keygen for timing license key is illegal. Featuring internet calibration, long term performance graphing with spectral analysis of cyclical variations, positional analysis with quality control statistics, and extreme flexibility in use, you will be able to achieve standards of measurement and diagnosis on a par with the most expensive instruments.

Newer technology nodes feature increased gate speeds as well as increased susceptibility to variation. Timing software free download timing top 4 download. When applied during timing analysis a cell in a short path will use a different derate factor than that same cell found in a long path. Addressing process variation and reducing timing pessimism at 16nm and below by ahmed elzeftawi, sr. By separately addressing the impact of random and systematic variations on timing, a designspecific margin can be obtained and used in downstream ocv analysis. Stagebased ocv can be used in timing and optimization tools as a fast approximation for statistical timing giving better more accurate results and helping to close timing at smaller process nodes. Static timing analysis of a design is performed to estimate its working frequency after the design has been fabricated. You will also enter basic internal and io timing constraints and analyze a design for these timing constraints using the timing analyzer, the timing analyzer in the quartus ii software. This technology offers faster top and block timing convergence, timing reuse, and scalability to complete daily analysis on any size designs. Ocv model is set of commands used during static timing analysis, whereas aocv model is a simple table of derating factors indexed by path depth, which was later subsumed in liberty format. In practical engineering, conventional ocv timing analysis utilizes a penalty factor, termed derating factor, for example 1. How to do sta setup timing analysis with jitter and real clocks. Timing derating is the universally accepted method to model the maximum ocv that the design is expected to incur.

Initially sta was used to find hold and setup violations in the clock tree, due to logic errors by designers. A parametric approach for handling local variation effects in timing. Static timing analysis of em b edded soft w are sharad malik margaret martonosi y autsun stev en li departmen t of electrical engineering, princeton univ ersit y abstract this pap er examines the problem of statically analyzing the p erformance of em b edded soft w are. Historically, as well as operating temperature, timing variation was primarily a consequence of subtle shifts in manufacturing conditions that would lead to ics from one batch. There has been an evolution of approaches in static timing analysis sta to address ocv. Can i get some basic to advance on both mcmm and ocv. Simply speaking, it is the inability of a clock source to produce a clock with clean edges. Featuring internet calibration, long term performance graphing with spectral analysis of cyclical variations, positional analysis with quality control statistics, and extreme flexibility in use, you. More accurate static timing analysis at advanced nodes.

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. However, in the last fifteen years its importance has grown to the point that it has become an essential step in the design. Us7992114b1 timing analysis using statistical onchip. Static timing analysis is not staying static march 15, 2010. Circuitspace helps designers reduce board layout and placement time from weeks to minutes with autoclustering technology, intelligent design ip reuse, and replication timingdesigner.

For a setup time check, it applies the maximum delays to the data path, and minimum delays to the clock path. However, in the last fifteen years its importance has grown to the point that it has become an essential step in the design of digital circuits. Quality of the dynamic timing analysis dta increases with the increase of input test. Primetime advanced timing analysis user guide version f2011. The pocv method has been implemented in a timing analysis software, and tested on. Yes, encounter does support ocv mode both for timing analysis and for. Timingdesigner an interactive timing analysis tool designers trust to deliver fast and accurate results for timing critical designs such as highspeed, multifrequency designs. On chip variation ocv is an increasing problem that starts at nm and its effects are increasing with smaller process nodes. The first task is to find all possible sources variation, and find out how these can affect a delay of a cell and hence, timing.

The biggest advantage of advanced ocv over traditional ocv is a more accurate timing analysis result. Magma unveils tekton first static timing analysis solution to deliver fast multiscenario analysis on a single cpu. Traditional ocv using a single constant derating factor is too conservative. The latest in static timing analysis with variation.

Synopsys primetime advanced ocv technology provides more finelytuned design margins in timing analysis by incorporating logicdepth information to determine pathspecific and cellspecific margin values. Circuit delay is increasingly affected by process variations at lower technology nodes. Generally, it is modeled using a simple derate number for data path, clock path, early path and late paths for rise and fall transitions during analysis phase and therefore require no model. Tempus timing signoff solution cadence design systems. This, in turn, has led to significant changes in the way that statictiming analysis is performed to account for effects. Ocv model is set of commands used during static timing analysis, whereas aocv model is a simple table of derating factors indexed by path depth. Ema enterprise connect connect engineering to the enterprise with native bidirectional integrations between your pcb cad environment and plm, erp, and mrp systems. Having all of them in a single course makes it bulky. This calculation can be made based on usersupplied activity files or through vectorless activity profiles. Dynamic timing analysis dta and static timing analysis sta are not alternatives to each other. Faraday pioneers in providing onchip variation ocv.

This overconservative derating factor is applied to all data paths or clock paths at the same time, and the timing analysis results are often too pessimistic. Principal product manager, and ken tseng, software. This course will give an eagles eye to every timing check that is being performed in current industries for signoff. Nominal delays of the logic gates as per characterization are calculated. In static timing analysis for any multi input gate, worst slew propagation is considered. The system 100b includes a statistical static timing analysis software tool 140 in communication with a static timing analysis software tool 142. Advanced onchipvariation timing analysis for nanometer. I have been getting this query, about, how to learn vlsi topic especially backend from scratch, and there you go. Methodologists are faced with addressing complex phenomena that impact circuit delay e. Primetime advanced ocv analysis is an efficient, easytoadopt solution that employs adaptive derating to accurately account for random and systematic process variations across an integrated circuit ic. An introduction to onchip variation ocv anysilicon. Microchip, fpga division is a leader in research, development and manufacturing of highly reliable nonvolatile field programmable gate arrays. Synopsys primetime advanced ocv technology provides.

Bhasker rakesh chadha static timing analysis for nanometer designs a practical approach. This article gives an overview and highlights the benefits of clock mesh technology compared to conventional clock tree methods. Nominal delays of the logic gates as per characterization are calculated and some pessimism is applied above that to see if there will be any setup andor hold violation at the target frequency. Dec 18, 2012 4 that may be used to calculate design specific on chip variation ds ocv derating factors.

Measuring clock skew using the timer the first step in coping with clock skew problems is to measure. Fast, accurate, highcapacity static timing analysis. There are various methodologies to address variation. So we decided to have it in 3 parts and this is part i. Each arc timing is then calculated statistically as the total of the nominal delay and the variation. Now let us get back to the analysis of sample path in figure 2 under ocv late early timing.

During setup timing the target of an sta engineer is to analyze the. The workshop will teach our recommended methodologies for a identifying constraints that are either incompleteincorrect causing invalid timing violations or hiding real timing violations, and b. At 16nm and below, onchip variation ocv becomes a critically important issue. Incentias timing software fully utilizes and takes advantages of the statistical ocv information to generate accurate analysis results with great performance. Designspecific on chip variation derating factors for.

This enhances the accuracy of timing analysis, eliminates unnecessary timing violations, and allows design teams to rapidly achieve timing closure. Abstract stagebased ocv derate tables are a systematic correction to liberty timing models to account for on chip process variation. Eda vendors should improve the runtime performance of pathbased analysis. Principal product manager, and ken tseng, software engineering group director, cadence at 16nm and below, onchip variation ocv becomes a critically important issue. An accepted trend in the semiconductor industry, where process geometry is continuously shrinking, is the growing impact of variation in static timing analysis. The concept of ocv was first introduced in technology nodes above 90nm. Eda vendors should improve the runtime performance of path. A novel approach for improving ocv impact earlier in the design cycle. Timing solution software is designed to forecast stock market future moves, to help you make better trading decisions.

Designed to more efficiently handle onchipvariation ocv, composite current source ccs models and crosstalk analysis, tekton overcomes the speed, capacity and accuracy limitations of traditional static timing analysis sta tools. Monte carlo simulation is the most accurate in addressing timing variation, accounting for each. Most importantly, my posts and videos have helped most of them and i really feel proud about it. In traditional ocv analysis, the static timing analyzer takes a conservative way to make sure timing behavior is correct under any conditions. Onchip variation ocv has become a larger problem at advanced nodes 16nm and below with respect to its impact on timing. And onchip variation ocv is one of them, specifically for static timing analysis interview. Timing software free download timing top 4 download offers free software downloads for windows, mac, ios and android computers and mobile devices. Static timing analysis comprises broadly for timing checks, constraints and library. Every cell has both a maximum delay and a minimum delay due to ocv. Software engineer timing and power analysis job in san. It is worthy to point out that ocv derating methodology makes following. The latest in static timing analysis with variation modeling.

Addressing process variation and reducing timing pessimism at. The timing analyzer, part of the intel quartus prime software, is an easytouse tool for creating synopsys design constraints sdc files and for generating detailed timing reports to shorten the process of timing closure. Timing analysis of realtime software raimund kirner vienna university of technology austria this is joint work with peter puschner and the costa and. Advanced onchipvariation timing analysis for nanometer designs.

Some embodiments can construct a first set of clock tree topologies for timing. Then as silicon geometries became smaller and smaller, circuit topology also. At 28nm technology nodes and below, static timing analysis sta alone is proving to be overly pessimistic and onchip variation ocv is leading to. More accurate static timing analysis at advanced nodes the. Advanced ocv this is also called location aware ocv in this we apply derating values on the cellsnets based on the logic depth from the common fanout point of the clock, ie. To encounter this variation, designs are closed in ocv mode. Synopsys primetime advanced onchip variation analysis. This type of ocv needs aocv tables in the timing libraries. Technologies that offer variation tolerance boost design performance and productivity. Primetime advanced ocv analysis is an efficient, easytoadopt solution that.

This analysis is coming from people who got interviewed and recruited into leading vlsi industries. As the clock edge can arrive within a range, the difference between two successive clock edges will. By limiting the analysis to clocks, the derate tables are only required for the clock cells, which are typically a small portion of the full cell library. Onchipvariation ocv and timingcriticality aware clock tree synthesis cts is described. Software engineer timing and power analysis job in san jose. Prevent timing rejection with fast and accurate results. In an ideal scenario, time given to the startpoint should be equal to the time borrowing of the latch. And onchip variation ocv is one of them, specifically for static timing analysis. Statistical sta ssta emerged in the early 2000s, providing a promising approach to address ocv.