astronomy

VisualSim Architect

VisualSim Architect is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand VisualSim Architect rather than just read about it. In short: VisualSim Architect is an electronic system-level software for modeling and simulation of electronic systems, embedded software, and semiconductors. VisualSim Architect is a commercial version of the Ptolemy II research project at the University of California Berkeley.

Key takeaways

VisualSim Architect belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect VisualSim Architect to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of VisualSim Architect from memory before moving on to harder problems.

Reference excerpt

VisualSim Architect is an electronic system-level software for modeling and simulation of electronic systems, embedded software, and semiconductors. VisualSim Architect is a commercial version of the Ptolemy II research project at the University of California Berkeley. The product was first released in 2003. VisualSim is a graphical tool that can be used for performance trade-off analyses using such metrics as bandwidth utilization, application response time, and buffer requirements. It can be used for architectural analysis of algorithms, components, software instructions, and hardware/software partitioning. VisualSim is used by over 50 companies worldwide and a similar number of universities for research projects. Honeywell Aerospace has collaborated with the University of Puerto Rico and used VisualSim to evaluate standards-based satellite platforms. NASA JPL worked on the Nexus initiative to develop the next generation interface standard. To select the best interface to meet the deterministic timing and maximum power consumption, architects build models of 10 different protocols including PCIe, Gigabit Ethernet, and RapidIO to compare the behavior for the same workload. The American University of Sharjah used performance evaluation methodologies to leverage exploration at the architectural level and assist in making early design tradeoffs. In this paper, the professor used the simulation platforms developed using the VisualSim tool to compare the performance of two memory architectures, namely, the Direct Connect architecture of the Opteron, and the Shared Bus of the Xeon multicore processors. Research and development on improving system architectures has been performed in networking, avionics, industrial, semiconductors, and high-performance computing fields. FPGA designers can perform high-speed virtual simulation of large electronic systems using VisualSim.As part of the Xilinx ESL initiative, the company has added support for on-FPGA CPUs. The Block Diagram Editor is the primary graphical user interface and is supported with customizable library blocks of hardware, software, and communication resources. Graphical viewers can be placed in the model for real-time viewing or for saving offline analysis. VisualSim has taken SystemC modeling to a higher level of abstraction. It also provides automatic template generation and intellectual property (IP) block importation. And it adds function calls designed to lift SystemC to a "microarchitectural" level. VisualSim is widely used for Performance Modeling, Architecture Exploration/Design Space exploration and early power analysis of Avionics, Automotive Electronics, Embedded Systems, High-Performance Computing Systems (HPC) and System-on-Chip (SoC). VisualSim simulation models of the proposed systems can be developed at various levels of hierarchy: Conceptual, Functional, and Architectural Level Modeling. The conceptual level models can contain a network of systems including Satellites, aircraft, and Ground vehicles. VisualSim functional models contain stochastic definitions of electronics, software, networks, and workload. Various types of statistical traffic generators and queuing models of the resources are available in the library folder. At the architectural level, the hardware and software models have cycle-accurate blocks of processors, memory subsystems, bus protocols, and trace files. Software behavior/application behavior can be defined using a State Machine, flow diagram, read/write operations, and IO activity. The mapping of the application to the system platform is defined in a spreadsheet. Communication architecture between different systems or sub-systems can be defined using VisualSim networking and wireless libraries. Software task arbitration and scheduling can be defined using VisualSim schedulers or the scripting language. The legacy models can be obtained by importing third-party models built in SystemC or C/C++. Algorithms developed using MatLab and Simulink can be used as a part of the VisualSim model.

Modeling libraries VisualSim provides modeling libraries for model-driven systems engineering activities. Libraries are used during the specification to optimize and validate the specification; during the hardware and software development phase to come up with the optimal architecture; and during the product debugging and testing phase to match the actual output with a set of expected results. VisualSim at the level of deriving Systems Specifications provides a complete visual inspection of the system operation as a combination of traffic input, behavioral system definition, and sink. This solution augments tools such as MatLab/Simulink and UML/SysML by providing very early visibility into the full system operation without getting into the details of the algorithm and code-level implementation. Typical example use cases would be Multimedia SoC with Network-On-Chip, In-Car networks using Ethernet, CAN, LIN and FlexRay, Submarine Inertial systems, etc. VisualSim modeling at the level of Hardware and Software is built after the system specification has been optimized and validated. The design can be refined by adding specific hardware implementation details, logic, and cycle-level timing to the VisualSim model. The device can be a board, set of boards, SoC, sub-system, or an Intellectual Property (IP). Implementation details can include the processor pipeline, functional cache, accelerators and bus arbiters. These refinements provide cycle-by-cycle and address-level evaluation of the system's functionality, performance, and power.

The libraries are at statistical, functional, and cycle-accurate levels of abstraction. As VisualSim libraries are embedded with timing and power details, the same model provides both performance computational results and power measurement values. Libraries can be configured to a specific technology manually or using a text or CSV file. If an architect wants to evaluate system behavior or performance with custom components, then he/she can modify library configurations by changing library parameters. An example of a Robotic Computer vision system model.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with VisualSim Architect

Start with the simplest possible case. Write down what VisualSim Architect claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to VisualSim Architect before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about VisualSim Architect ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of VisualSim Architect

In research: VisualSim Architect appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses VisualSim Architect in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: VisualSim Architect is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2003 software, Semiconductor analysis, University of California, Berkeley, so understanding it makes those chapters shorter.
In everyday life: Look for VisualSim Architect outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study VisualSim Architect in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what VisualSim Architect means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain VisualSim Architect out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is VisualSim Architect in simple terms?

Why does VisualSim Architect matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study VisualSim Architect?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on VisualSim Architect.