Lyon trio Lucy Bronze, Ada Hegerberg and Amandine Henry are the UEFA Women's Player of the Year nominees.

China in January closed all its museums and tourist centres all over the country to prevent the spread of the coronavirus.

Winds are from the Northwest at 28.8 gusting to 34.5 MPH (25 gusting to 30 KT). The pressure is 1010.2 mb and the humidity is 40%. The wind chill is 31. Last Updated on May 9 2020, 11:56 am EDT.

Winds are from the Northwest at 21.9 gusting to 29.9 MPH (19 gusting to 26 KT). The pressure is 1011.0 mb and the humidity is 34%. The wind chill is 35. Last Updated on May 9 2020, 11:51 am EDT.

Winds are from the West at 20.7 gusting to 34.5 MPH (18 gusting to 30 KT). The pressure is 1009.0 mb and the humidity is 41%. The wind chill is 33. Last Updated on May 9 2020, 11:53 am EDT.

Winds are from the West at 23.0 gusting to 31.1 MPH (20 gusting to 27 KT). The pressure is 1011.3 mb and the humidity is 39%. The wind chill is 36. Last Updated on May 9 2020, 11:51 am EDT.

Winds are from the West at 12.7 gusting to 20.7 MPH (11 gusting to 18 KT). The humidity is 75%. The wind chill is 22. Last Updated on May 9 2020, 11:55 am EDT.

Winds are from the West at 24.2 gusting to 33.4 MPH (21 gusting to 29 KT). The pressure is 1009.8 mb and the humidity is 35%. The wind chill is 35. Last Updated on May 9 2020, 11:56 am EDT.

Physical synthesis has been around in various forms for many years. The basic idea is to bring some awareness of physical layout into synthesis. This week (June 3, 2015) Cadence is rolling out the Genus™ Synthesis Solution, a next-generation RTL synthesis tool that takes physical awareness in some new directions.

Here are four important things to know about Genus technology:

• A massively parallel architecture improves turnaround time by up to 5X while maintaining quality of results
• The Genus solution synthesizes up to 10M+ instances flat without impacting power, performance and area (PPA)
• The Genus solution provides tight correlation with the Innovus Implementation System, using the same placement and routing algorithms
• Globally focused PPA optimization saves up to 20% datapath area and power

Compared to previous-generation products such as the Cadence Encounter RTL Compiler Advanced Physical Option, the Genus solution approaches physical synthesis in a different way. The Encounter solution applied physical optimization “at the tail end of synthesis,” said David Stratman, senior principal product manager at Cadence. “We were doing a final incremental push, but we could only do so much, since we had locked in a lot of the earlier steps from a logical-only synthesis perspective.”

Genus Synthesis Solution supports the physical synthesis features in the previous Encounter solution, but it also brings the full physical scope upstream to RTL logic designers. “It’s going to enable the unit-level RTL designer to gain the benefits of physical synthesis without having to understand it,” Stratman said. As an example, users can apply generic (unmapped) placement at the earliest stages of synthesis, using a lightweight version of the Innovus placement engine. The bottom line: “Genus is a full solution where every step of synthesis can be done physically.”

Getting Massively Parallel

If you bring physical data into synthesis, you need a way to improve capacity and runtimes, especially with today’s gigantic advance-node SoCs. That’s why a massively parallel architecture is the cornerstone of the Genus solution. In this way, the Genus solution is following in the footsteps of the Innovus Implementation System, which also provides a massively parallel architecture.

Both the Innovus and Genus solutions can handle blocks of 10M instances flat. Given that SoCs today may have up to 100M instances, and often up to 50-100 top-level blocks, this is an important capability. Many tools today will only handle blocks of 1M instances. As a result, design teams often have to constrain block sizes.

Genus technology offers timing-driven, multi-level design partitioning across multiple threads and machines. It enables a near-linear runtime scaling without impacting PPA. According to Stratman, the Genus solution will scale well beyond 64 CPUs for a large design, with a “sweet spot” around 8-20 CPUs for today’s typical block sizes. Runs that used to take days, he noted, can now be done in hours.

As shown below, Genus technology leverages parallelism at three levels. The Genus solution can distribute design partitions to multiple threads or CPUs, and also supports local algorithm-level multithreading on each machine with shared memory. An adaptive scheduler ensures the best use of the available CPUs.

Fig. 1 – Genus Synthesis Solution provides three levels of parallelism

With its massive parallelism, Stratman said, Genus technology can obtain production-level quality of results (QoR) in runtimes typically seen in “prototype-level” synthesis runs. The “secret sauce,” he said, is in the partitioning. Cadence has found a way to generate partitions in a way that “slices the design more intelligently, and takes advantage of the Genus database to merge partitions without losing timing, power, or area,” Stratman said.

Playing in the Sandbox

In the Genus Synthesis Solution, a process called “sandboxing” allows any subset or partition of a design to be extracted along with full timing and a physical context. Optimization algorithms will treat a sandbox as a complete design.

The “Clipper” flow clips out or extracts the context of the larger SoC blocks. “It’s kind of a skeleton floorplan but it has all the timing information,” Stratman said. These extracted contexts include all the critical physical information to make the right RTL synthesis choices at the unit level. This information is used to streamline the handoffs between unit-level RTL designers, integration engineers, and implementation engineers. It’s a way for logic designers to gain some physical knowledge without having to be a physical synthesis expert, or without having to run a full top-level synthesis.

Fig. 2 – Clipper flow provides context for unit-level blocks

Correlation with Innovus Implementation System

Although Genus technology can work with third-party IC implementation systems, it shares algorithms and engines with Innovus Implementation System, as well as a common user interface. As shown below, both the Genus and Innovus solutions use a table-based Quantus QRC parasitic extraction, effective current source model (ECSM) and composite current source (CCS) delay calculations, and a unified global routing engine. Timing and wire length claim a 5% correlation.

Fig. 3 – Genus Synthesis Solution offers tight correlation with Innovus Implementation System

Genus technology doesn’t model everything to the same level of accuracy as the Innovus solution, however. “We chose to be lighter weight and more nimble to get expected runtimes,” Stratman said. A tight correlation is possible because the Genus and Innovus solutions use a similar code base. This correlation will be tighter than that between Encounter RTL Compiler Advanced Physical Option and the Encounter Digital Implementation System today.

Genus Synthesis Solution uses a new Hybrid Global Router that provides the ability to resolve congestion and construct layer-aware, timing-driven wire topologies. This accelerates analysis and debug, and reduces iterations. Users can avoid blockages and see a full Manhattan route as opposed to “flight lines.” Layer awareness is particularly important, given the large RC variations within the metal stack at advanced process nodes.

A version of the Innovus GigaPlace engine is available within the Genus solution. Here, users can do an RTL-level generic gate placement early in the synthesis flow (“generic gate” means there is no mapping into standard cell libraries, but there’s still an area estimate). This helps designers understand PPA tradeoffs earlier.

While users can go all the way to a design-rule “legal” placement with Genus Synthesis Solution, this isn’t generally recommended. “You can do a placement and use the same algorithms as GigaPlace and get a nice correlation without all the runtimes and additional steps of doing a fully legal placement,” Stratman said.

So where does Genus technology end and Innovus technology begin? That’s up to the user. You could use the Genus solution for logical synthesis and run all physical implementation in the Innovus system. If you run physical synthesis within the Genus solution, there’s more work earlier in the flow, but you get better insights into downstream problems and reduce iterations.

“Physical synthesis should be no more than 2X [runtime] of logic synthesis,” Stratman said. “All of the runtime that moves up should be shaved off of the place-and-route stages, because now you can do lightweight incremental optimization and incremental placement. The overall flow should be runtime neutral or better.”

Be Globally Aware

Finally, Genus Synthesis Solution offers a globally focused early PPA optimization across the whole datapath, delivering up to a 20% area reduction in the datapath. Stratman noted that this capability is a follow-on to an RCP feature called “globally focused mapping” that can determine the best cells to use in a library. What’s new with the Genus solution is that this concept has been applied at the arithmetic level.

For example, there are many ways to configure a multiplier – you may want to prioritize speed, power, or size. In the past, Stratman noted, synthesis tools have not been very good at globally optimizing the architecture selection for PPA optimization. “We can [now] find the most efficient global datapath implementation for a given region,” he said.

For further information about the Cadence Genus Synthesis Solution, including a datasheet and technical product brief, see this landing page.

Richard Goering

Related Blog Posts

Designer View – RTL Synthesis Success Strategies at 28nm and Below

Front-End Design Summit: The Future of RTL Synthesis and Design for Test

Physically-Aware Synthesis Helps Design a New Computer Architecture

Hi,

There was tool available with INCISIV called imc to view the coverage reports.

The question is: How can we view the code coverage reports generated with XCELIUM? I think imc is not available with XCELIUM?

Thanks in advance.

This Metasploit module exploits a vulnerability in the FreeBSD run-time link-editor (rtld). The rtld unsetenv() function fails to remove LD_* environment variables if __findenv() fails. This can be abused to load arbitrary shared objects using LD_PRELOAD, resulting in privileged code execution.

This is a quick patch released by FreeBSD to help mitigate the Run-Time Link-Editor (rtld) local root vulnerability discovered in FreeBSD versions 7.x and 8.x.

The HydroVision International event is now under way in the Oregon Convention Center in Portland, with more than 3,000 hydropower professionals from around the world coming together for four days of learning and networking.

The HydroVision International event is now under way in the Oregon Convention Center in Portland, with more than 3,000 hydropower professionals from around the world coming together for four days of learning and networking.

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For years, the oldest turtle fossils we could find had fully formed shells. Now, more primitive fossils are revealing the strange tale of how turtle shells evolved

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Manoella Gemaque Cavalcante, Cleusa Yoshiko Nagamachi, Julio Cesar Pieczarka, and Renata Coelho Rodrigues Noronha

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Lots of gaming headphone deals for those brave enough to go into stores.
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Welcome to the Evening Standard's live blog covering the latest transfer news and rumours from the Premier League and beyond.

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The Justice Department today announced that it has reached an agreement with Morton’s of Chicago/Portland Inc. to settle allegations that it required two non-citizens authorized to work in the United States to present more documents than legally required to establish their work eligibility.

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Yesterday a federal grand jury in Portland, Ore., indicted George Allen Mason Jr., 23, and his wife, Saraya Sophia Lisa Gardner, 23, on charges related to a the assault of a 26-year-old gay man who was walking his dog with his boyfriend on the streets of Hillsboro, Ore., which occurred because of animus against the victim’s sexual orientation.