System Architecture Exploration Training Class
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This document describes a training webinar on system architecture exploration using VisualSim software. It includes an agenda for a two-day training covering basics of VisualSim like traffic generation, queues, plotting statistics. It also describes exploring hardware and software platforms using resources like servers, queues and system resources in VisualSim. The document discusses processing models, reporting statistics and experimenting with different system options.
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System Architecture Exploration Training Class
- 1. TRAINING: SYSTEM ARCHITECTURE EXPLORATION Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 2. Logistics of the Webinar 2 To ask a question, click on Cloud Chat sign and type the question. Folks are standing by to answer your questions. There will also be a time at the end for Q&A
- 3. TRAINING: SYSTEM ARCHITECTURE EXPLORATION Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 4. Support Resources Application and support engineers at info@mirabilisdesign.com VisualSim Software download Training videos: ◦ Complete training: https://www.youtube.com/playlist?list=PLizKwf7N88at70EwhqvFq_zDaLkoQEKg1 ◦ Foundation Tutorial: https://www.youtube.com/watch?v=0e1LVYU26rc&list=PLizKwf7N88at70EwhqvFq_zDaLkoQEKg1&index=3 ◦ Flow Control and Network Modeling: https://www.youtube.com/watch?v=oH2C0_ET5qY&list=PLizKwf7N88at70EwhqvFq_zDaLkoQEKg1&index=4 ◦ Real time applications: https://www.youtube.com/watch?v=96ro8fpf2aQ&list=PLizKwf7N88at70EwhqvFq_zDaLkoQEKg1&index=5 ◦ Power modeling: https://www.youtube.com/watch?v=n4VudSX3Wjo&list=PLizKwf7N88at70EwhqvFq_zDaLkoQEKg1&index=6 ◦ Cache Tutorial: https://www.youtube.com/watch?v=gOzkYcpU3c4&list=PLizKwf7N88at70EwhqvFq_zDaLkoQEKg1&index=7
- 5. Agenda- Day 1 Introduction to VisualSim Methodology for different applications Analysis using pre-built models for hardware, software, semiconductor and networking Basic training on VisualSim GUI and data structure Traffic generation Behavior modeling Queues, delays, schedulers and preemption Statistics, plotting
- 6. Agenda- Day 2 Review the basics from Day 1 Answer questions on the take-home tutorials Discussion on Scripting and Programming System Hardware components Semiconductor Components Custom Development
- 7. Company Milestone VisualSim Online 18 companies 32 universities VisualSim 3.0 HW Modelling 35 customers 2003 Company Incorporated 2005 First Engagement with HP 2008 VisualSim 1.0 2010 10th Customers 2011 Stochastic modeling 20132015 2018 New VisualSim 50th Customer 2019 Document generator 250 products built 2020 Failure analysis ISO/DO/IEC Target- 70 Customers
- 8. Customers
- 9. Mirabilis Design Offering VisualSim software with libraries Quickstart includes training and ongoing model consulting- user builds the blocks and systems Modeling services to develop custom library components- user assembles the models Modeling Services to develop custom libraries and models. User conducts parameter study Modeling services to develop model, analyse and provide architecture feedback
- 10. Products Developed using VisualSim Market opportunity is huge because of the breath of applications
- 11. Application of VisualSim ◦ Mapping algorithms on integrated and distributed systems ◦ Architecting processor, hardware accelerator and memory/cache/IO ◦ Resource requirements for software task graphs ◦ Designing protocols, firmware, network topology and buses 11 Performance Analysis Power Exploration HW-SW Partitioning Hardware Software Network Libraries Discrete-Event Simulator Graphical Validate and optimize your design quickly and accurately
- 12. Timing Throughput Security Capacity Planning Power Planning Buffer Usage Resource Efficiency Failure Analysis The Way Forward using System Simulation and VisualSim Architect Eliminate all surprises prior to development
- 13. Largest System Level IP Custom Creator Support Power Listeners, Debuggers, Tracers, Assertions Table, Energy harvesters, Battery Distribution, Sequence, Trace file, Instruction profile Traffic Reports Latency, Throughput, Utilization, Ave/peak power, Statistics RTL-Like RTOS Clock, Wire-Delay, Registers, Latches and Flip-flop, ALU and FSM, Mux, DeMux, Lookup table Generic RTOS, ARINC 653, AUTOSAR AMBA (AHB/ APB/ AXI), Corelink, CoreConnect, Network-on-Chip, Virtual Channel, DMA, Crossbar, Serial Switch, Bridge SOC Board- Level VME, PCI/PCI-X/PCIe, SPI 3.0, Rapid IO, 1553B, FlexRay, CAN- FD, AFDX, TTEthernet, OpenVPX Processors ARM (M-Series), ARM (A8, A72, A53, A76), RISC-V, Nvidia- Drive-PX, Configurable GPU, DSP, mP and mC, PowerPC, X86- Intel and AMD, DSP- TI and ADI, Others: MIPS, Tensilica, Renesas SH, Marvel Stochastic Queue ,Time Queue, Quantity Queue, System Resources, Scheduling algorithms Script language, 600 RegEx, Task graph, Use cases, Programming languages Storage Flash, NVMe, Disk Memory Controller, MPMC, Fibre Channel, Fire Wire Switched Ethernet, Resilient Packet Ring, RP3, Wireless LAN 802.11, Bluetooth and PAN, Spacewire, Audio-Video Bridging, IEEE802.1Q Networking Memory • Memory Controller, SDR, DDR DRAM 2,3,4, LPDDR 2, 3, 4, HBM, HMC, QDR, RDRAM FPGA Xilinx- Zynq, Virtex, Kintex, Intel-Stratix, Arria, Microsemi- Smartfusion, Programmable logic generator, External links to I/O, Network and Memory Completeness of Library is Key to Rapid Prototyping
- 14. Case Studies • Processor vs FPGA • Create a table of preferred parts based on battery capacity, orbital activities, sensor rates and error conditions • Compared FPGAs, DSP and ARM-based processor families • Established a list of criteria to select the board for each spacecraft sub-system Processor Organization • Autonomous Driver Assistance System • Evaluate the behavior of different software configurations on highly distributed networks • Provide the OEM recommendations on assignment of LIDAR/RADAR and ECU to load software • Measure the response times for braking and collision avoidance Automotive Organization • Designing Network and Processing ASICs and Boards • Create a front-end systems engineering process for all Defense ASICs • Run use cases with different combination of processor, memory controller and backplane ASIC • Provide customers with expected performance metrics by migrating to latest platform Defense Organization
- 15. Overview of System Modeling Architecture Exploration ◦ Optimize and validate the system specification Performance Analysis Power Measurement Functional Correctness Failure Analysis Making Better Quality Products
- 16. Application Mapping on Platform Complex behavior - input stream - data dependent behavior Contention - limited resources - scheduling/arbitration Interference of multiple applications - limited resources - scheduling/arbitration - anomalies I/O DSP CPU1 CPU2 task1 task2 task3 task4 Scheduling software tasks using limited resources
- 17. Determine Impact of Trade-off Decisions System with faster Bus is slower in places Unpredictable System Response
- 18. Types of High-Level Modeling Flow Control and Functional Analysis Task Graphs SoC Timing and Cycle-Accurate Mapping Software Application onto Hardware Platform Failure Analysis Networked IoT System with RISC-V
- 19. Network System with Flow Control
- 20. VisualSIm Modeling of Flow Control
- 22. VisualSim Model of the Task Graph
- 24. SoC/Processor Design Target Power < 1.0W Number of frames in 20 ms > 13K Three Explorations 1. All tasks deployed in Software 2. Some tasks migrated to Hardware accelerators 3. Adding power management
- 25. IP-based Modeling in VisualSim Processor Bus Topology Memory Controller Hardware Accelerators Power management Use Cases
- 27. Software Modeling Mapping of software tasks onto hardware platforms Software can be defined as ◦ Task Graph ◦ Source code integrated into the flow ◦ Instruction sequence or statistical model based on execution on real hardware ◦ Trace file from existing system GEM5 integration to co-simulate with software ◦ Run the OS and Software on GEM5 ISS of RISC-V, ARM or x86 ◦ VisualSim runs the SoC and the system
- 28. Mapping Radar to DSP/Xeon
- 29. Solving the Design Challenges – Failure • Virtual Bus ( VB ) can be CAN , FlexRay etc.. • ECU’s have Preemptable Runnable Task Queues • T_n’s ( Runnable Task groups ) are assigned to ECU’s
- 30. Evaluating the Impact of Failures Without Faults With Faults
- 31. Networked IoT System with RISC-V Device 1 AFE RISC-V core BLE Radio Transceiver Network Hub Data Center
- 32. IoT model • Evaluations • Power consumption of each device • Optimal HW and SW configuration to meet the end-to-end application timing deadline from IoT to the data center • Performance with Big data and fast data workloads
- 33. Reports
- 34. TRAINING: BASICS OF VISUALSIM Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 35. Documentation and Support Installation Guide Getting Started Demo models for Libraries and Applications Quick Reference Guide List of Libraries and Regular Expression Tutorials List of Training Videos Listing of Errors OnlineSupport Portal
- 36. Parts of the Block Diagram 3. Libraries 5. Parameters 6. Variables 11. Use cases Behavior 8. Traffic 7. Setup 4. Annotations 2. Toolbar 1. Menu-Bar 10. Architecture 9. Report 12. Mapping
- 37. Library Folders
- 38. TRAINING: UNDERSTANDING PARAMETERS, DATA STRUCTURES AND VARIABLES Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 39. Parameters, Variables, Fields Parameter ◦ Constant throughout a simulation ◦ Link top-level parameter to blocks ◦ defined in the model window or a block Usage ◦ Sweep through parameter values Variables • Variable is a single value register or memory location • Can vary during the simulation • Can be accessed by all blocks •Types Local- used in current window Global- available in full model Block- available in Script and ExpressionList blocks Data Structure Field • Carried with the packet, request or transaction • Dynamically create and remove fields •Usage Can be signal, protocol field or simulation information Expression results can be stored in the Fields Local- used in current window
- 40. ExpressionList- Use Case for Parameter, Data Structure Field or Variable • If value is used as constant throughout the simulation, then it is a Parameter • If the value must be modified to run iterations, then best to maintain the parameter at the top-level • If value is specific to this packet, image or signal, then insert in Field • If value will change during simulation and is required in multiple model locations, then use a Variable
- 41. TRAINING: TRAFFIC, PROCESSING AND REPORTING Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 42. Traffic • Input to the system that triggers the components to perform a function • Traffic definition requires: Time distribution between generated events Data Structure - packet, frame, IC pins etc Fields: Define standard data headers/ control such as data, address, source, destination, priority, ToS etc Initial values for the fields of the Data Structure
- 43. Trace File Based • Use a trace dump from the network, cache, memory or processor pipeline • Traffic Reader block • The expected file is ASCII text Any number of columns and rows Each column has the first row with header and the second row with types The header name is the field name Any number of rows and columns are supported
- 44. Processing •Data Flow Describe actions based on expressions Results stored in fields if data frame specify actions or variables if required by the whole model •Control Flow ExpressionList used to deicide if-else; while, and case-switch are used •Delay Simple delay before output •Virtual Flow Direct data to other parts of the model using named connections and wireless Use Mux and Demux blocks for creating instruction decodes, protocol switching, broadcast etc.
- 45. ExpressionList Block Can add any number of input and output ports All input ports must be available for the block to execute All input data vales are saved in queues associated with each port Code is executed in sequence No branch, loops or jumps in the code ◦ Exception: Single line if-else statement Output controlled by Condition
- 46. Result Statistics ◦ ResourceStatistics ◦ Statistics blocks to collect statistics at intermediate points Plot data ◦ Bar, Histogram or XY plots ◦ Special viewers- Matrix, Image, MPEG and speakers Collect data ◦ Write to screen or to files (Excel, text or XML) Assertions or tests ◦ High/low value for scalar ◦ Conditional model activity ◦ Model termination
- 47. Time Data Plotter • Plot double values against simulation time • View or save the results of the simulation in a XY format. • Used to depict latency, throughput and other variables that vary against time.
- 48. Histogram •The plotter accepts data on the input and plots them as a histogram. •View the plot in real-time or save for future viewing.
- 49. Text Display •Output to text the data structure and statistics • The input type can be of any type. •Can be set to Save/View from Post Processor •Cannot be viewed from the Post Processor
- 50. TRAINING: RESOURCE TO DEFINE HARDWARE AND SOFTWARE PLATFORM Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 51. Resources Two types ◦ Time ◦ Quantity Time can be four types- ◦ Delay known in advance- Server ◦ Delay not predictable in advance- Queue ◦ Request from multiple flows or actions- System_Resource ◦ Request needs extended processing- System_Resource_Extend Level of details ◦ Stochastic: Delays, Quantity and Buffering ◦ Timing-Accurate: Processor, Memory and RTO
- 52. Quantity Based Resources • Represents an integer quantity of elements which can be allocated, freed, created or consumed • Provides queuing if request cannot be fulfilled • Passive Resources • Resource units represent something that must be possessed before a transaction (DS) can continue • Full Library -> Resources - > Quantity-Based
- 53. Server • Active Resource • Advanced Timed_Queue_N_Priority • Define multiple queues + time delay • DataStructures queued in FIFO or LIFO order • Special operation mechanism – SLOT • Resources - > Server
- 54. Queue • Active Resource • Multiple independent Queues • Requires a pop to send DS on the output port • Delay in Queue is not predictable prior
- 55. System Resource Overview Blocks ◦ Behavior: Mapper, SoftwareMapper, DynamicMapper ◦ Architecture: SystemResource_Extend, SystemResource ◦ Notify: SystemResource_Done Concept • Multiple threads map one or more SystemResources Can be located anywhere in the model flow Dynamically mapped based on DS field or parameter • SystemResource_Done calls back the SystemResource_Extend to release for next task during refinement
- 56. Differences Features System Resource SystemResource_Extend Preemption Yes No Hierarchical Yes No Extended Task Processing No Yes Non – Blocking No Yes
- 57. Statistics •Generated Using Resource Statistics RegEx Function Array Lookup • Resource Statistics gives Buffer Occupancy, Delay, Number of Transactions entered, exited, rejected • Array Lookup eg: Length_A = Queue_Length(1) -> This gets the length of Queue Number 1
- 58. Experimenting with Different System Options Model 1: ◦ Feeding traffic to a processing resources ◦ Feeding traffic to a bus or network resource ◦ Multi-core and Multi-channel design Model 2: ◦ Multiple applications sending request to a single processor core ◦ Making one software task to be Mutual Exclusion and make the Processor to be preemptable ◦ Adding power analysis to the design
- 59. Home Project Review tutorials in VisualSim Attempt the following three tutorials Practice tutorials for this Training Foundation Tutorial- Part 1 Performance Modeling- Flow Control Network Modeling- Exploring Network Usage Architecture Modeling- Cache Tutorial
- 60. TRAINING: END OF TRAINING DAY 1 APRIL 13 Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 61. TRAINING: TRAINING DAY 2 APRIL 15 Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 62. Logistics of the Webinar 62 To ask a question, click on Arrow to the left of Chat and type the question. Folks are standing by to answer your questions. There will also be a time at the end for Q&A
- 63. TRAINING: TRAINING DAY 2 APRIL 15 Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 64. ANY QUESTIONS? Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 65. Home Project Review tutorials in VisualSim Attempt the following three tutorials Practice tutorials for this Training Foundation Tutorial- Part 1 Performance Modeling- Flow Control Network Modeling- Exploring Network Usage Architecture Modeling- Cache Tutorial
- 66. Recap of Day 1 Covered the types of models in VisualSim Understand the basic methodology in VisualSim Studied the introductions to Traffic, Analysis, Resource, Processing and Power consumption Different types of Resources and their usage
- 67. Agenda- Day 2 Review the basics from Day 1 Answer questions on the take-home tutorials Discussion on Scripting and Programming System Hardware components Semiconductor Components Custom Development
- 68. TRAINING: POWER MODELING Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 69. Introduction to Power Modeling Power modeling at the system-level is necessary because power- based problems are one of the primary causes of costly-respins ◦ Heat dissipation ◦ Low battery life ◦ Lack-luster power-performance trade-off Power-based and time-based system requirements must be evaluated in the same environment Examples of power investigations at the system-level ◦ Dynamic Voltage and Frequency Scaling (DVFS) ◦ Power control logic for SOC power domains ◦ Power gating ◦ SOC architecture comparisons based on power
- 70. Block Functional and Power Mode Diagrams Function 1 Function 2 Function N Block Functional Diagram Block Power Mode Diagram
- 72. Statistics • Instantaneous Power (port) • Average Power consumed (port) • Power Dissipated (port) • Instant (powerCurrent) and total power consumed (powerCumulative) by device
- 73. TRAINING: SCRIPTING Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 74. Programming Logic, Arbitration, Scheduler Script language is integrated into the simulator and block diagram Can add any number of Input and Output part All inputs are stored in a single queue in order of arrival ◦ Exception: Virtual connections get highest priority Top section define the variable Right below will be any code that needs to execute without any input trigger When input arrives, the code beginning from LABEL:BEGIN will start executing The currently executing transaction is stored in a variable called port_token. Note: Multiple transaction can be executing in the code but only one transaction will be active
- 75. RegEx, Keywords and Functions LABEL:BEGIN ◦ Code works lik regular C code ◦ Includes special functions called RegEx ◦ Special keywords are available QUEUE, EVENT, TIMEQ, SEND Virtual Connections ◦ SEND to another Script block or IN block ◦ SEND to another LABEL in the current code to create a separate Thread Parameter, Variables and Field ◦ Can be accessed from the same BDE window ◦ Variables can be defined on the top of this code. Also, use Local and Global variables ◦ Add new fields, remove field or update existing field in the Port_Token ◦ Can read content in Queue, Server, SystemResources and Hardware blocks
- 76. TRAINING: MODEL DEBUGGING Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 77. Debuggers •Breakpoints •Stop & Restart •Trace Tracking •Animation •Dynamic Plotters •Listen to Port •Listen to Block •Listen to Simulator •Digital Debugger •Error Messages • Batch Mode Simulation • Power Timing Diagram • Variable Dump • RegEx • Script Debugging • Data Structure Fields • AutoSave • Logger for Verilog and SystemC • Plotters & Text Display
- 78. TRAINING: SUPPORT INFRASTRUCTURE Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 79. Database • Lookup table for doing searches • Used as Routing Table • Main features of the Database block: Read Write Remove
- 80. Hierarchical Blocks • Grouping a set of functional blocks that combine to define a function or device
- 81. Class • A class is a master version of the block. • Class is an XML sub-model • Can be instantiated multiple times in the model. • Changes made to class block are replicated to all linked instances • All sub-models need a Simulator
- 82. Dynamic Instantiation • Creates multiple instances of itself during the preinitialize phase of model execution. • Each instance of this block behaves exactly like a Hierarchical block. • Helps significantly in building large designs where the model structure scales.
- 83. TRAINING: APPLICATIONS OF THE VISUALSIM BLOCKS Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com
- 84. Failure Analysis Hardware Failure: Loss of processing cores, limited storage, reduced or loss memory device or bus overload/incorrect signals. Software failure: Resource starvation, deadlocks, data overwrite. Network failure: Network Congestion, misconfiguration, link loss and network errors. RTOS failure :Unable to achieve real-time deadlines, malicious change in schedule table, and executes beyond time slots. Power Failure: Both reduced and full power failure. Slower processing speed, limited number of resources can be executing concurrently.
- 85. Functional Diagram of a Radar System
- 86. Architecture Design Challenges What should be the hardware configuration for this application? Does the processing meet the timing deadline? Which tasks consume the most time and memory bandwidth? Can I modify the sequence or change the prior or create an offset that would get better performance without changing the hardware What is the power consumed by the system? Can I increase the number of sensors or handle larger data sizes? What is the individual processing and resource capacity for each task- input to the developers? What are the corner cases for additional test development?
- 87. Comparing the Architecture Options
- 88. Secondary PCI Bus, 64 Bit Up to 66 MHz ADSP-TS201S TigerSHARC DSP DSP #1 512MB～1024MB SDRAM 8片TSOPII54 QL5064 QuickLogic 64-bit Embedded PCI Controller ADSP-TS201S TigerSHARC DSP DSP #2 64-bit, 83.3 MHz DSP Cluster Bus 1 LINK LINK LINK LINK LINK VirtexII-Pro XILINX LINK to VirtexII-Pro RocketIO (4 Channels) to VXS P0 Boot Flash peripheral 8-bit bus QL5064 Peripheral 8-bit bus DSP1 Ints&Flags DSP2 Ints&Flags DSP3 Ints&Flags DSP4 Ints&Flags QL5064 Peripheral 8-bit bus ADSP-TS201S TigerSHARC DSP DSP #3 512MB～1024MB SDRAM 8片TSOPII54 QL5064 QuickLogic 64-bit Embedded PCI Controller ADSP-TS201S TigerSHARC DSP DSP #4 64-bit, 83.3 MHz DSP Cluster Bus 2 LINK Boot Flash peripheral 8-bit bus LINK to VirtexII-Pro LINK to VirtexII-Pro LINK to VirtexII-Pro DSP 1 LINK DSP 2 LINK DSP 3 LINK DSP 4 LINK PCI 64/66 IPcore PowerPC 405e RS232接口 RS232 串行接口 to P2 PCI 64位/66MHz PMC槽 Boot Flash Map Individual Functions to Hardware Units LDS6527- Mercury Computer TI DSP based
- 90. Multi-core BLE 5.0 SoC family with system PMU (Power Management Unit ) Block Diagram VisualSim Model
- 91. Network on Chip Block Diagram VisualSim Model
- 92. Multi-Bus SoC Processor A H B B U S On Chip Memory A X I B U S Bridge External Memory DMA Display control System-on-Chip Block Diagram VisualSim Model
- 93. Assembling a System Model 1: ◦ Assembling a system with AXI bus and with AHB and comparing the results ◦ Adding a PCIe to the input interface ◦ Distributing traffic from sensors and processing resources
- 94. TRAINING: TRAINING DAY 2 APRIL 15 Deepak Shankar Founder Mirabilis Design Inc. Email: dshankar@mirabilisdesign.com