The mysterious missive was written by P.J. Féret, who conducted an archaeological dig at the same site in northern France in 1825

A new study sheds light on the muscular, dexterous appendage, suggesting trunk wrinkles are more important than many people realize

Thousands of years ago, our ancestors used symbols to track the sale of textile and agricultural products. New research suggests that these markings informed the development of writing

A new study has shattered historians' long-held assumptions about some of the people who died in Mount Vesuvius' eruption in 79 C.E.

An exhibition at the Huntington Library, Art Museum and Botanical Gardens explores how Western intellectuals viewed the climate crisis between 1780 and 1930

The OCA's decision Friday to announce that Rachel Homan's team would only represent the province at the national championship if the skip wasn't picked for the Olympic mixed doubles team generated criticism from some corners and confusion from others.

OM Madagascar responded to the declining literacy rate in the Androy region by starting a literacy course in Ambovombe. Last month the first class graduated, and the second class began.

At the end of April, the second ZOOM national mission conference, with 300 participants from over 80 cities and towns, was held in Warsaw, Poland.

Ethnomusicologists visited a North African country to help local singers and a Sudanese Nubian believer write a worship song in his language and style.

Accomplished writer and Penn State alum Jami Nakamura Lin will read from her works at 6 p.m. on Thursday, Nov. 14, in Foster Auditorium as part of the 2024-25 Mary E. Rolling Reading Series.

Roebuck will discuss his past and future projects, many of which were filmed in the Lehigh Valley.

The Government Employees' Pension Fund delivered a return of 4.9% on investments for its members in the year to end-March.

Keep it simple, keep it flexible, and keep the routine familiar are among the suggestions three educators give in assigning students work while distance learning.

Texas law requires all elementary school students to learn about their community, but when 2nd grade teacher Marilyn Phillips looked for a book to anchor her lessons on Fort Worth, there was none. So she wrote her own.

"I didn't realize how much I would gain from going to school" Dipu shares about OM Bangladesh's Village Primary Schools.

The UP Police Constable Exam 2024 was conducted on August 23, 24, 25, 30, and 31, 2024.

Samantha Harvey's "Orbital" is the second-shortest novel to win the award and the first to be set in space.

The final entry of Queen Elizabeth's private diary has been made public. During her record-breaking 70-year reign, the monarch, who died in 2022 at age 96, kept a private diary to take note of the events of the day and record her activities.

Samantha Harvey's "Orbital" is the second-shortest novel to win the award and the first to be set in space.

The application of real-time data processing or responsiveness is crucial, such as in high-performance computing, data centers, or applications requiring low-latency data transfers. It enables efficient use of PCIe bandwidth and resources by intelligently managing memory write operations based on system dynamics and workload priorities. By effectively leveraging Deferrable Memory Write [DMWr], Devices can achieve optimized performance and responsiveness, aligning with the evolving demands of modern computing applications.

What Is Deferrable Memory Write?

Deferrable Memory Write (DMWr) ECN introduced this new memory transaction type, which was later officially incorporated in PCIe 5.0 to CXL2.0. This enhanced type of memory transaction is Deferrable Memory Write [DMWr], which flows as another type of existing Read/Write memory transaction; the major difference of this Deferrable Memory Write, where the Requester attempts to write to a given location in Memory Space using the non-posted DMWr TLP Type, it Postponing their completion of memory write transactions to improve overall system efficiency and performance, those memory write operation can be delay or deferred until other priority task complete.

The Deferrable Memory Write (DMWr) requires the Completer to return an acknowledgment to the Requester and provides a mechanism for the recipient to defer (temporarily refuse to service) the Request.

DMWr provides a mechanism for Endpoints and hosts to choose to carry out or defer incoming DMWr Requests. This mechanism can be used by Endpoints and Hosts to simplify the design of flow control, reduce latency, and improve throughput. The Deferrable Memory writes TLP format in Figure A.

(Fig A) Deferrable Memory writes TLP format.

Example Scenario

Here's how the DMWr works with a simplified example: Imagine a system with an endpoint device (Device A) and a host CPU (Device B). Device B wants to write data to Device A's memory, but due to varying reasons such as system bus congestion or prioritization of other transactions, Device A can defer the completion of the memory write request. Just follow these steps:

1. Initiation of Memory Write: Device B initiates a memory write transaction to Device A. This involves sending the memory write request along with the data payload over the PCIe physical layer link.
2. Acknowledgment and Deferral: Upon receiving the memory write request, Device A acknowledges the transaction but may decide to defer its completion. Device A sends an acknowledgment (ACK) back to Device B, indicating it has received the data and intends to complete the write operation but not immediately.
3. Deferred Completion: Device A defers the completion of the memory write operation to a later, more opportune time. This deferral allows Device A to prioritize other transactions or optimize the use of system resources, such as memory bandwidth or processor availability.
4. Completion and Response: At a later point, Device A completes the deferred memory write operation and sends a completion indication back to Device B. This completion typically includes any status updates or additional information related to the transaction.

Usage or Importance of DMWr

Deferrable Memory Write usage provides the improvement in the following aspects:

• Reduced Latency: By deferring less critical memory write operations, more critical transactions can be processed with lower latency, improving overall system responsiveness.
• Improved Efficiency: Optimizes the utilization of system resources such as memory bandwidth and CPU cycles, enhancing the efficiency of data transfers within the PCIe architecture.
• Enhanced Performance: Allows devices to manage and prioritize transactions dynamically, potentially increasing overall system throughput and reducing contention.

Challenges in the Implementation of DMWr Transactions

The implementation of deferrable memory writes (DMWr) introduces several advancements and challenges in terms of usage and verification:

1. Timing and Synchronization: DMWr allows transactions to be deferred, complicating timing requirements or completing them within acceptable timing windows to avoid protocol violations. Ensuring proper synchronization between devices becomes critical to prevent data loss or corruption.
2. Protocol Compliance: Verification must ensure compliance with ECN PCIe 6.0 and CXL specifications regarding when and how DMWr transactions can be initiated and completed.
3. Performance Optimization: While DMWr can improve overall system performance by reducing latency, verifying its impact on system performance and ensuring it meets expected benchmarks is crucial.
4. Error Handling: Handling errors related to deferred transactions adds complexity. Verifying error detection and recovery mechanisms under various scenarios (e.g., timeout during deferral) is essential.

Verification Challenges of DMWr Transactions

The challenges to verifying the DMWr transaction consist of all checks with respect to Function, Timing, Protocol compliance, improvement, Error scenario, and security usage on purpose, as well as Data integrity at the PCIe and CXL.

1. Functional Verification: Verifying the correct implementation of DMWr at both ends of the PCIe link (transmitter and receiver) to ensure proper functionality and adherence to specifications.
2. Timing Verification: Validating timing constraints associated with deferring writes and ensuring transactions are completed within specified windows without violating protocol rules.
3. Protocol Compliance Verification: Checking that DMWr transactions adhere to PCIe and CXL protocol rules, including ordering rules and any restrictions on deferral based on the transaction type.
4. Performance Verification: Assessing the impact of DMWr on overall system performance, including latency reduction and bandwidth utilization, through simulation and testing.
5. Error Scenario Verification: Creating and testing scenarios to verify error handling mechanisms related to DMWr, such as timeouts, retries, and recovery procedures.
6. Security Considerations: Assessing potential security vulnerabilities related to DMWr, such as data integrity risks during deferred transactions or exposure to timing-based attacks.

Major verification challenges and approaches are timing and synchronization verification in the context of implementing deferrable memory writes (DMWr), which is crucial due to the inherent complexities introduced by deferred transactions. Here are the key issues and approaches to address them:

Timing and Synchronization Issues

1. Transaction Completion Timing:
   • Issue: Ensuring deferred transactions are completed within the specified time window without violating protocol timing constraints.
   • Approach: Design an internal timer and checker to model worst-case scenarios where transactions are deferred and verify that they are complete within allowable latency limits. This involves simulating various traffic loads and conditions to assess timing under different scenarios.
2. Ordering and Dependencies:
   • Issue: Verifying that transactions deferred using DMWr maintain the correct ordering and dependencies relative to non-deferred transactions.
   • Approach: Implement test scenarios that include mixed traffic of DMWr and non-DMWr transactions. Verify through simulation or emulation that dependencies and ordering requirements are correctly maintained across the PCIe link.
3. Interrupt Handling and Response Times:
   • Issue: Verify the handling of interrupts and ensure timely responses from devices involved in DMWr transactions.
   • Approach: Implement test cases that simulate interrupt generation during DMWr transactions. Measure and verify the response times to interrupts to ensure they meet system latency requirements.

In conclusion, while deferrable memory writes in PCIe and CXL offer significant performance benefits, their implementation and verification present several challenges related to timing, protocol compliance, performance optimization, and error handling. Addressing these challenges requires rigorous testing and testbench of traffic, advanced verification methodologies, and a thorough understanding of PCIe specifications and also the motivation behind introducing this Deferrable Write is effectively used in the CXL further. Outcomes of Deferrable Memory Write verify that the performance benefits of DMWr (reduced latency, improved throughput) are achieved without compromising timing integrity or violating protocol specifications.

In summary, PCIe and CXL are complex protocols with many verification challenges. You must understand many new Spec changes and consider the robust verification plan for the new features and backward compatible tests impacted by new features. Cadence's PCIe 6.0 Verification IP is fully compliant with the latest PCIe Express 6.0 specifications and provides an effective and efficient way to verify the components interfacing with the PCIe 6.0 interface. Cadence VIP for PCIe 6.0 provides exhaustive verification of PCIe-based IP and SoCs, and we are working with Early Adopter customers to speed up every verification stage.

More Information

• For more info on how Cadence PCIe Verification IP and TripleCheck VIP enable users to confidently verify PCIe 6.0, see our VIP for PCI Express, VIP for Compute Express Link, and TripleCheck for PCI Express
• See the PCI-SIG website for more details on PCIe in general and the different PCI standards.

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.

Do You Have Access to the Cadence Support Portal?

If not, follow the steps below to create your account.

• On the Cadence Support portal, select Register Now and provide the requested information on the Registration page.
• You will need an email address and host ID to sign up.
• If you need help with registration, contact support@cadence.com.

To stay up to date with the latest news and information about Cadence training and webinars, subscribe to the Cadence Training emails.

If you have questions about courses, schedules, online, public, or live onsite training, reach out to us at Cadence Training.

For any questions, general feedback, or future blog topic suggestions, please leave a comment.

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.

Adaobi Tricia Nwaubani is a writer to reckon with among Nigerian female writers. Her works portrays the Igbo culture and thereby carved a niche for herself in the literary world. She is a novelist, humourist, essayist and journalist. Nwaubani is the first contemporary African writer on the global stage to have an international book deal while still living in her home country. She was born in 1976 in Enugu into the family of Chief Chukwuma Nwaubani and Dame Patricia Nwaubani. And was educated at Federal Government Girls’ College, Owerri. She studied psychology at the University of Ibadan. As a teenager, […]

LONDON — British writer Samantha Harvey won the Booker Prize for fiction on Tuesday with "Orbital," a short, wonder-filled novel set aboard the International Space Station that ponders the beauty and fragility of the Earth. Harvey was awarded the 50,000-pound ($64,000) prize for what she has called a "space pastoral" about six orbiting astronauts, which she began writing during COVID-19 pandemic lockdowns. The confined characters loop through 16 sunrises and 16 sunsets over the course of a day, trapped in one another's company and transfixed by the globe's ever-changing vistas. "To look at the Earth from space is like a child looking into a mirror and realizing for the first time that the person in the mirror is herself," said Harvey, who researched her novel by reading books by astronauts and watching the space station's live camera. "What we do to the Earth we do to ourselves." She said the novel "is not exactly about climate change, but implied in the view of the Earth is the fact of human-made climate change." She dedicated the prize to everyone who speaks "for and not against the Earth, for and not against the dignity of other humans, other life." "All the people who speak for and call for and work for peace — this is for you," she said. Writer and artist Edmund de Waal, who chaired the five-member judging panel, called "Orbital" a "miraculous novel" that "makes our world strange and new for us." Gaby Wood, chief executive of the Booker Prize Foundation, noted that "in a year of geopolitical crisis, likely to be the warmest year in recorded history," the winning book was "hopeful, timely and timeless." Harvey, who has written four previous novels and a memoir about insomnia, is the first British writer since 2020 to win the Booker. The prize is open to English-language writers of any nationality and has a reputation for transforming writers' careers. Previous winners include Ian McEwan, Margaret Atwood, Salman Rushdie and Hilary Mantel. De Waal praised the "crystalline" writing and "capaciousness" of Harvey's succinct novel — at 136 pages in its U.K. paperback edition, one of the shortest-ever Booker winners. "This is a book that repays slow reading," he said. He said the judges spent a full day picking their winner and came to a unanimous conclusion. Harvey beat five other finalists from Canada, the United States, Australia and the Netherlands, chosen from among 156 novels submitted by publishers. American writer Percival Everett had been the bookies' favorite to win with "James," which reimagines Mark Twain's "Huckleberry Finn" from the point of view of its main Black character, the enslaved man Jim. The other finalists were American writer Rachel Kushner's spy story "Creation Lake"; Canadian Anne Michaels' poetic novel "Held"; Charlotte Wood's Australian saga "Stone Yard Devotional"; and "The Safekeep" by Yael van der Wouden, the first Dutch author to be shortlisted for the Booker. Harvey is the first female Booker winner since 2019, though one of five women on this year's shortlist, the largest number in the prize's 55-year history. De Waal said issues such as the gender or nationality of the authors were "background noise" that did not influence the judges. "There was absolutely no question of box ticking or of agendas or of anything else. It was simply about the novel," he said before the awards ceremony at Old Billingsgate, a grand former Victorian fish market in central London. Founded in 1969, the Booker Prize is open to novels originally written in English published in the U.K. or Ireland. Last year's winner was Irish writer Paul Lynch for post-democratic dystopia "Prophet Song." Lynch handed Harvey her Booker trophy at the ceremony, warning her that her life was about to change dramatically because of the Booker publicity boost. Harvey said she was "overwhelmed" but remained down-to-earth about spending her prize money. She said she'd disburse "some of it on tax. I want to buy a new bike. And then the rest — I want to go to Japan."

2025 Melvin M.S. Goo Writing Fellowship

to write a rhetorical analysis paper on an article

to write an autobiographical essay for a scholarship

to write a review paper on a movie

to write journals examples

to write good documentation

to write a chiller thriller sally spedding

to write an analysis paper on article

to write a chapter summary for college

to write policy and procedures manual template

to write a portfolio paper

to write thesis acknowledgement

to write a project management report

82cd writer plus manual

to write an apa style paper

to write autobiography essay

to write an elementary report

to write a year end report

to write a paper on terrorism

to write informal report

to write a chairpersons report