Have you ever wanted to write a DRC rule deck to check for space or width constraints on polygons? Or have you wondered how the multiple lines of an LVS rule deck extract and conduct a comparison between the schematic and layout? Maybe you've been curious about the role of rule deck writers in creating high-quality designs ready for tape-out.

If any of these questions interest you, there is good news: the latest version (v23.1) of the Physical Verification Rules Writer (PVLRW) course is designed to teach you rule deck writing. This free 16-hour online course includes audio and labs designed to make your learning experience comfortable and flexible. Whether you are new to the concept or an experienced CAD/PDK engineer, the course is structured to enhance your rule deck writing skills.

The PVLRW course covers six core modules: Layer Processing, DRC Rules, Layout Extraction, ERC and LVS Rules, Schematic Netlisting, and Coloring Rules. There are also three optional appendix sections. Each module explains relevant rules with syntax, concepts, graphics, examples, and case studies.

This course is based on tool versions PEGASUS231 and Virtuoso Studio IC231.

Pegasus Input and Output

Pegasus is a cloud-ready physical verification signoff solution that enables engineers to support faster delivery of advanced-node integrated circuits (ICs) to market.

Pegasus requires input data in the form of layout geometry, schematic netlists, and rules that direct the tool operation. The rules fall into two categories: those that describe the fabrication process and those that control the job-specific operation.

Pegasus provides log and report files, netlists, databases, and error databases as output.

Overview of Pegasus Rule File

The rule decks written in Physical Verification Language (PVL) work for the Cadence PV signoff tools Pegasus and PVS (Physical Verification System).   

The PVL rules are placed in a file that gets selected in a run from the GUI or the command line, as the user directs. PVL rules may be on separate lines within the file and can also be contained in named rule blocks.

Each line of code starts with a PVL rule that uses prefix type notation. It consists of a keyword followed by options, input layer or variable names, and output layer or variable names.

A rule block has the format of the keyword rule, followed by a rule name you wish to give it, followed by an opening curly brace. You enter the rules you wish to perform, followed by a closing curly brace on the last separate line.

  Sample Rule deck with individual lines of code and rule blocks.

DRC Rules

The first step in a typical Pegasus flow is a Design Rule Check (DRC), which verifies that layout geometries conform to the minimum width, spacing, and other fabrication process rules required by an IC foundry. Each foundry specifies its own process-dependent rules that must be met by the layout design.

There are three types of DRC rules: layer definition rules, layer derivation rules, and DRC design check rules. Layer definition rules identify the layers contained in the input layout database, and layer derivation rules derive additional layers from the original input layers, allowing the tool to test the design against specific foundry requirements using the design check rules.

A sample DRC Rule deck

A layout view displaying the DRC violations

LVS Rules

The Pegasus Layout Versus Schematic (LVS) tool compares the layout netlist with the schematic netlist to check for discrepancies.

There are two essential LVS rule sets: LVS extraction rules and comparison rules. LVS extraction rules help extract drawn devices and connectivity information from the input layout geometry data and outputs into a layout netlist. The LVS extraction rule set also includes the layer definition, derivation, extraction, connectivity, and net listing rules.

LVS comparison rules are associated with comparing the extracted layout netlist to a schematic netlist.

A sample LVS Rule deck. 

TCL, Macros, and Conditional commands

Tcl is supported and used in various Pegasus functionalities, such as Pegasus rule files and Pegasus configurator. Macros are functional templates that are defined once and can be used multiple times in a rule file. Conditional Commands are used to process or skip specific commands in the rule file.

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Related Resources

About Knowledge Booster Training Bytes

Knowledge Booster Training Bytes is an online journal that relays information about Cadence Training videos, online courses, and upcoming webinars in the Learning section of the Cadence Learning and Support portal. This blog category brings you direct links to these videos, courses, and other related material on a regular basis. Subscribe to receive email notifications about our latest Custom IC Design blog posts.

Hi 

I am looking into chamfering the edge of PCB for Board edge connectors. I have performed fillet command earlier but new to chamfering.

Below is the description :

As seen above, the PCB edge are chamfered in thickness as well as at the corners.

Using OrCAD PCB hotfix S023.

Che(read more)

This blog describes how to efficiently use Virtuoso Visualization and Analysis XL.(read more)

This blog helps in demonstrating the use of Pin to trunk routing style which helps in enhancing the layout experience.(read more)

In an era of abundant and constantly evolving information, the challenge is not just accessing knowledge but understanding and applying it effectively. AI is a transformative technology that is reshaping how we learn, work, and grow. In this blog, we’ll explore how AI accelerates our knowledge acquisition and understand how it can relate to the process of learning, which connects with our daily lives.

The role of AI is to accelerate knowledge by personalizing learning experiences, providing instant access to information, and offering data-driven insights. AI empowers us to learn more efficiently and effectively in many ways. I won't go into much detail, as we are already busy searching for the meaning of AI and what it can do; however, I want to share one inspiring fact about AI. It can analyze vast amounts of data in seconds, making sense of complex information and providing instantaneous actionable insights or concise answers. I understand that humans are looking to speed up things, which can help us understand technology better and perform our tasks faster.

The main reason AI is in focus is because of its ability to perform tasks faster than ever. We aim to enhance the performance of all our products, including the everyday household electronic items we use. Similarly, are we striving to accelerate the learning process? I am committed to assisting you, and one such method is concise, short (minute-long) videos.

In today's fast-paced world, where attention spans are shorter than ever, the rise of social media platforms has made it easier for anyone to create and share short videos. This is where minute videos come in. These bite-sized clips offer a quick and engaging way to deliver information to the audience with a significant impact. Understanding the definitions of technical terms in VLSI Design can often be accomplished in just a minute.

Below are the definitions of the essential stages in the RTL2GDSII Flow. For further reference, these definitions are also accessible on YouTube.

Want to Learn More?

The Cadence RTL-to-GDSII Flow training is available as both "Blended" and "Live" Please reach out to Cadence Training for further information.

And don't forget to obtain your Digital Badge after completing the training!

• You can check out a free Online Version of the training above, which is available 24/7 for all customers with a Cadence Learning ans Support Portal
• You will also have access to our Training Byte Library then which is full of hundres of troubleshooting videos, like the following: What is Digital Implementation?
• You can find more instructions how to get the best out of the Portal in this blog.
• If you would like to stay up-to-date with the latest news and information about Cadence trainings and webinars, subscribe to the Cadence Training emails.

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The UN Sustainable Development Goals aim to end global poverty, but poorer countries are struggling to hit them. More help from richer countries is crucial, writes Mazdak Rafaty.

Giant investment firm BlackRock throwing its weight behind sustainability issues is sending a signal to the corporate world to respond urgently to global calls for action, writes Gregg Wassmansdorf.

The Government aims to build a “more resilient, more inclusive and more modern” economy. For Austrade’s work, the Government focus on addressing climate change, strengthening ties with strategic partners, diversifying trade and investment, and First Nations people, continues.

As of Nov. 11, Chromebook deals are aplenty ahead of Black Friday 2024. Check out our top picks from Lenovo, Asus, Samsung, and others.

In the fourth "Bridget Jones" film, Bridget (Renée Zellweger) tries dating again after Mark Darcy's (Colin Firth) death. Trailer.

Austrade is seeking feedback on options to improve the Export Market Development Grants (EMDG) program.

First Nations business Aldridge Railway Signals was named Exporter of the Year at Supply Nation’s Supplier Diversity Awards.

Check here each week to keep up with the latest from John MacArthur's pulpit at Grace Community Church.

Judges of the Federal High Court of Nigeria are to proceed on 2024 Christmas Vacation on Monday December 16, this year. According to a circular signed by the Chief Judge of the Court, Hon. Justice John Terhemba Tsoho, the Judges are to return to work on Monday January 6, 2025. However, normal court sitting would […]

Federal High Court of Nigeria Judges begin Christmas Vacation Dec 16

The U.S. Senate's Democratic majority began a crusade on Tuesday to confirm as many new federal judges nominated by President Joe Biden as possible to avoid leaving vacancies that Republican Donald Trump could fill after taking office on Jan. 20. With Republicans set to take control of the chamber on Jan. 3, the Senate on Tuesday held a confirmation vote on one of Biden's judicial nominees - former prosecutor April Perry - for the first time since Trump won the Nov. 5 presidential election. The Senate voted 51-44 in favor of her becoming a U.S. district court judge in Illinois. All told, Biden has announced another 30 judicial nominees who are awaiting Senate confirmation votes. Sixteen have already have been reviewed by the Senate Judiciary Committee and are awaiting a final confirmation vote by the full Senate. Another 14 nominees are awaiting committee review. The U.S. Constitution assigns to the Senate the power to confirm a president's nominees for life-tenured seats on the federal judiciary. "We are going to get as many done as we can," Democratic Senate Majority Leader Chuck Schumer said in a statement. Trump made 234 judicial appointments during his first four years in office, the second most of any president in a single term, and succeeded in moving the judiciary rightward - including building a 6-3 conservative majority on the U.S. Supreme Court with three appointees. Biden has appointed a host of liberal judges. Since the beginning of his presidency in 2021, the Senate has confirmed 214 Biden judicial nominees, including liberal Supreme Court Justice Ketanji Brown Jackson. About two-thirds were women, and the same share were racial minorities. Senate Democrats are under pressure to swiftly confirm the remaining nominees, along with any new picks Biden may name in the waning weeks of his presidency. How many nominees Senate Democrats will be able to confirm remains to be seen. Trump in a social media post on Sunday called on the Senate to halt approving Biden's nominees, saying, "Democrats are looking to ram through their Judges." Billionaire Trump backer Elon Musk on Tuesday wrote on social media that "activist" judicial nominees are "bad for the country." Mike Davis, a Trump ally at the conservative judicial advocacy group Article III Project, in another post urged Senate Republicans to vote down all judicial appointments until January. "The American people voted for monumental change," Davis wrote on social media last week. "Grind the Senate to a halt." Current Senate Republican leader Mitch McConnell's office declined comment. McConnell has consistently opposed Biden's nominees and, as majority leader, was instrumental in getting Trump's previous nominees confirmed. Trump's judicial appointees have been involved in major decisions welcomed by conservatives including Supreme Court rulings rolling back abortion rights, widening gun rights, rejecting race-conscious collegiate admissions and limiting the power of federal regulatory agencies. Judicial nominees require a simple majority for confirmation. Democrats currently hold a slim 51-49 majority, meaning that they can ill afford any defections or absences if Republicans show up in force to oppose Biden's nominees during the chamber's post-election "lame duck" session. West Virginia Senator Joe Manchin, an independent who caucuses with the Democrats, has said he would not vote for any nominee who does not garner at least one Republican vote. Must-pass legislation like a spending bill to avert a government shutdown also may consume precious time during the session. 'Every possible nominee' Biden's allies have said a concerted push to confirm his remaining nominees would allow him to build on his legacy of helping to diversify a federal bench long dominated by white men. He is not done nominating judges. On Friday, Biden announced his first post-election nominee, Tali Farhadian Weinstein, who after unsuccessfully running in the 2021 Democratic primary to be Manhattan district attorney was picked for a job as a federal district judge in New York. A spokesperson for Senator Dick Durbin, the No. 2 Senate Democrat and chair of the Judiciary Committee, said in a statement that he "aims to confirm every possible nominee before the end of this Congress." White House spokesperson Andrew Bates on Monday noted that during Trump's first term, the Republican-controlled Senate confirmed 18 judges after Biden had won the 2020 election but before he took office. Pending nominees include five to the influential federal appeals courts. Republicans said before the election that they had the votes to block two of them: Adeel Mangi, who would become the first Muslim federal appellate judge, and North Carolina Solicitor General Ryan Park, who unsuccessfully defended the race-conscious admissions policies before the Supreme Court. There are several others nominated to serve as trial court judges like Perry, a former prosecutor now working at Chicago-headquartered GE HealthCare who would join the bench in Illinois. Biden nominated her to a judgeship in April after her prior nomination to become Chicago's top federal prosecutor was blocked by Republican Senator JD Vance. Vance began placing a hold on Biden's nominees to the U.S. Justice Department in 2023 after Special Counsel Jack Smith secured the first of two federal indictments against Trump, who subsequently picked the senator as his vice presidential running mate.

The promised global shift from fossil fuels remains unmet as fossil fuel continues to expand in Southeast Asia with the backing of international financiers, environmental groups said.

United Nations — The U.N. Secretary-General appealed Monday to developed nations to make good on their promise of $100 billion a year to support climate action in developing countries, ahead of a November climate review conference in Egypt.   “Funding for adaptation and resilience must represent at least half of all climate finance,” Antonio Guterres told reporters.    Ministers, climate experts and civil society representatives are meeting this week in the Congolese capital, Kinshasa, to prepare the agenda for the November meeting, known as COP27, which will take place in the Red Sea resort of Sharm el-Sheikh from November 6 to 18.    The United Nations says G-20 countries account for 80% of global emissions, but they have been slow to deliver on their $100 billion annual pledge.   “Taken together, current pledges and policies are shutting the door on our chance to limit global temperature rise to 2 degrees Celsius, let alone meet the 1.5-degree goal,” he said of the benchmarks set in the 2015 Paris Climate Agreement.    The U.N. warns that failure to reach those goals would spell climate catastrophe.   “The world can’t wait,” he added. “Emissions are at an all-time high and rising.”   Guterres said every government, business, investor and institution must step up with concrete climate action plans.    “I am urging leaders at the highest level to take full part in COP27 and tell the world what climate action they will take nationally and globally,” the U.N. chief said.    U.S. Special Presidential Envoy for Climate John Kerry is among the leaders in Kinshasa this week.   

[Liberian Investigator] Monrovia -- Sources have hinted to The Liberian Investigator that the Executive Branch, through the Ministry of Finance & Development Planning, is contemplating submitting the 2025 draft national budget to the breakaway "majority bloc" in the House of Representatives later this week.

Judges block Albania model again and order return of 7 migrants to Italy

Bridget Jones: Mad About the Boy trailer out with Renee ZellwegerBridget Jones: Mad About the Boy, the third instalment in the Bridget Jones franchise, seems to have a new love triangle for the titular character.The first trailer for the upcoming movie got released on Tuesday, Nov. 12,...

Standing high on the vertiginous edge of the future and looking down into a volcanic seething of approaching doom, it is a totally understandable desire to want to close your eyes, walk away and turn on the sports channel. If you have one. Put the air-con on too. Last year was the hottest on human […]

The 2025 budget is the city's most conservative when it comes to spending growth in any year not impacted by the COVID-19 pandemic since 2011.

The judge overseeing Donald Trump’s criminal hush money case has put off ruling on whether the president-elect’s conviction should be thrown out on immunity grounds, enabling prosecutors to weigh next steps following his November 5 election victory.

Justice Juan Merchan had been due to rule on Tuesday on Trump’s argument that the US Supreme Court’s decision in July that presidents are immune from prosecution involving their official acts meant the New York state case should be dismissed.

Instead, Merchan granted a request by Manhattan District Attorney Alvin Bragg’s office to have until Nov 19 to consider how to approach the case in light of Trump’s looming inauguration in January 2025, email correspondence made public on Tuesday showed.

Trump’s scheduled Nov 26 sentencing is now widely expected to be postponed.

Trump in May became the first US president — former or sitting — convicted of a crime when a jury in Manhattan found him guilty on 34 felony counts of falsifying business records to cover up a potential sex scandal shortly before his first election win in 2016. Trump, who pleaded not guilty, has vowed to appeal the verdict after sentencing.

Prosecutor Matthew Colangelo wrote there were “competing interests” between ensuring a criminal case proceeds as usual and protecting the office of the president.

“The People agree that these are unprecedented circumstances,” Colangelo wrote.

Trump is set to be the first felon inaugurated as president after his victory over Vice President Kamala Harris.

At issue in the six-week Manhattan trial was a $130,000 payment made by Trump’s then-lawyer Michael Cohen to adult film actress Stormy Daniels to keep quiet about a sexual encounter she said she had with him in 2006 but which he has denied.

Trump’s defense lawyer Emil Bove wrote that the case ultimately needed to be dismissed to avoid interfering with Trump’s presidential duties.

“The stay, and dismissal, are necessary to avoid unconstitutional impediments to President Trump’s ability to govern,” Bove wrote.

Trump faced four criminal cases

Trump, 78, is hoping to enter office unencumbered by any of four criminal cases he has faced and which once were thought to have threatened to derail his 2024 candidacy to return to the White House after having served from 2017 to 2021.

The Republican Trump has portrayed the hush money case brought by Bragg, a Democrat, and the three other state and federal criminal indictments brought in 2023 as politically motivated attempts to harm his presidential campaign. He pleaded not guilty in all four cases.

“It is now abundantly clear that Americans want an immediate end to the weaponization of our justice system,” Trump campaign spokesperson Steven Cheung said in a statement on Tuesday.

Special Counsel Jack Smith brought two of the cases against Trump, one involving classified documents he kept after leaving office and the other involving his efforts to overturn his 2020 election loss. A Florida-based federal judge in July dismissed the documents case. The Justice Department is now evaluating how to wind down Smith’s election-related case.

Trump also faces state criminal charges in Georgia over his bid to reverse his 2020 loss in that state, but the case remains in limbo.

The Supreme Court, in a decision arising from one of Smith’s two cases against Trump, decided that presidents are immune from prosecution involving their official acts and that juries cannot be presented evidence of official acts in trials over personal conduct. It marked the first time that the court recognized any degree of presidential immunity from prosecution.

In making the case for immunity, Trump’s lawyers said the jury that convicted Trump in the hush money case was shown evidence by prosecutors of his social media posts as president and heard testimony from his former aides about conversations that occurred in the White House during his 2017-2021 term.

Bragg’s office countered that the Supreme Court’s ruling has no bearing on the case, which they said concerned “wholly unofficial conduct.” The Supreme Court in its ruling found no immunity for a president’s unofficial acts.

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Gender-lens investing (GLI) represents an opportunity to channel targeted funds to women’s businesses and other gender equality areas.

The proposed project will build a bridge across the Fanga'uta Lagoon in Nuku'alofa, the capital of the Kingdom of Tonga (Tonga). The crossing will consist of an approximately 720 m long bridge and 4.96 km of approach roads from Nuku'alofa to Vaini, southern Tongatapu.

In some recent years, the Amazon biome released more carbon than it absorbed, and further degradation could make it a permanent shift

Twenty people may have died 2000 years ago when an Iron Age bridge suddenly collapsed following a tsunami or flood, but scientists also cannot rule out that they were sacrificed

A monument in southern Spain that dates to between 3600 and 3800 BC appears to have been built with an understanding of geology and physics

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