This document introduces VLSI physical design. It discusses how the number of transistors on chips has rapidly increased over time, from 100,000 to over 3 million. Complex chip design is now only possible using computer-aided design tools. The document outlines the different levels of abstraction in chip design from behavioral modeling down to the cell/mask level. It provides examples of logical and architectural design, and discusses the different layout styles including full-custom, gate-array, and standard-cell approaches.
The physical design flow begins with placement which involves assigning exact locations to modules like gates and standard cells to minimize area and interconnect cost while meeting timing constraints, with the goal of enabling easier routing; placement tools take as input the netlist, floorplan, libraries, and constraints to perform global and detailed placement as well as optimization. The quality of placement significantly impacts the ability to route the design successfully.
Define Width and Height of Core and Die (http://www.vlsisystemdesign.com/PD-F...VLSI SYSTEM Design
https://www.udemy.com/vlsi-academy
The very first step in chip design is floorplanning, in which the width and height of the chip, basically the area of the chip, is defined. A chip consists of two parts, 'core' and 'die'.
This is the presentation that was shared by Nilesh Ranpura and Vineeth Mathramkote at CDNLIVE 2015. The session briefs about the implementation challenges and covers the solution approach and how to achieve results
Fusion Compiler is the next-generation RTL-to-GDSII implementation system architected to address the complexities of advanced node designs and deliver up to 20% improved PPA while reducing Time To Results (TTR) by 2X.
This document discusses various concepts related to physical design implementation. It describes the inputs and outputs of physical design tools, important checks to perform before starting design such as clock and high fanout net budgeting, and concepts like floorplanning, placement, routing, libraries, multi-voltage design, and clock tree synthesis and optimization.
This document discusses multi mode multi corner (MMMC) analysis for chip design. It defines that a mode is a set of design parameters like clocks and timing constraints, and a corner captures process, voltage, and temperature variations. It provides examples of multiple modes like normal, sleep, and test modes and corners for temperature, voltage, process variations, and parasitic interconnects. The document gives an example of analyzing a chip with 4 modes under 3 process-voltage-temperature corners and 3 parasitic interconnect corners, showing 9 analysis cases.
Timing and Design Closure in Physical Design Flows Olivier Coudert
A physical design flow consists of producing a production-worthy layout from a gate-level netlist subject to a set of constraints. We focus on the problems imposed by shrinking process technologies. It exposes the problems of timing closure, signal integrity, design variable dependencies, clock and power/ground routing, and design signoff. It also surveys some physical design flows, and outlines a refinement-based flow.
The physical design flow begins with placement which involves assigning exact locations to modules like gates and standard cells to minimize area and interconnect cost while meeting timing constraints, with the goal of enabling easier routing; placement tools take as input the netlist, floorplan, libraries, and constraints to perform global and detailed placement as well as optimization. The quality of placement significantly impacts the ability to route the design successfully.
Define Width and Height of Core and Die (http://www.vlsisystemdesign.com/PD-F...VLSI SYSTEM Design
https://www.udemy.com/vlsi-academy
The very first step in chip design is floorplanning, in which the width and height of the chip, basically the area of the chip, is defined. A chip consists of two parts, 'core' and 'die'.
This is the presentation that was shared by Nilesh Ranpura and Vineeth Mathramkote at CDNLIVE 2015. The session briefs about the implementation challenges and covers the solution approach and how to achieve results
Fusion Compiler is the next-generation RTL-to-GDSII implementation system architected to address the complexities of advanced node designs and deliver up to 20% improved PPA while reducing Time To Results (TTR) by 2X.
This document discusses various concepts related to physical design implementation. It describes the inputs and outputs of physical design tools, important checks to perform before starting design such as clock and high fanout net budgeting, and concepts like floorplanning, placement, routing, libraries, multi-voltage design, and clock tree synthesis and optimization.
This document discusses multi mode multi corner (MMMC) analysis for chip design. It defines that a mode is a set of design parameters like clocks and timing constraints, and a corner captures process, voltage, and temperature variations. It provides examples of multiple modes like normal, sleep, and test modes and corners for temperature, voltage, process variations, and parasitic interconnects. The document gives an example of analyzing a chip with 4 modes under 3 process-voltage-temperature corners and 3 parasitic interconnect corners, showing 9 analysis cases.
Timing and Design Closure in Physical Design Flows Olivier Coudert
A physical design flow consists of producing a production-worthy layout from a gate-level netlist subject to a set of constraints. We focus on the problems imposed by shrinking process technologies. It exposes the problems of timing closure, signal integrity, design variable dependencies, clock and power/ground routing, and design signoff. It also surveys some physical design flows, and outlines a refinement-based flow.
The document discusses timing closure in FPGA design flows. It explains that timing requirements include clock period/frequency, throughput, and latency. The timing-driven design flow in Lattice Diamond is outlined, highlighting key steps like defining timing constraints, running synthesis and implementation with timing analysis, and iterating to resolve issues. Timing constraints like input/output delays and exceptions are also covered.
Clock tree synthesis log messages provide information about:
1) Preprocessing steps like design updates, buffer characterization, and clock tree constraints.
2) The clock tree synthesis process which includes clustering, meeting timing targets, and reporting results.
3) Post processing steps like embedded clock tree optimization, DRC fixing, and placement legalization.
1. The document discusses the key steps in physical design flow, including import design, floorplanning, placement and routing.
2. Floorplanning is described as a critical step, where the quality of the floorplan can significantly impact timing closure and design implementation. Good techniques for floorplanning include understanding the design requirements and data flow.
3. The document outlines the major steps in floorplanning such as sizing and shaping blocks, voltage area creation, pin placement, row creation, macro placement, adding blockages and special cells. Qualifying the floorplan involves checks on pin grids, design rules, power connections and more.
In this course, you
● Identify and apply timing arc information from a library, such as unateness, delays, and slew
● Identify cell delays from a library and calculate output slew degradation
● Use wire-load information to calculate net delays
● Identify the properties of a clock, including period, edges, and slew, and calculate the duty cycle
● Apply setup and hold checks to diagnose design violations
● Identify timing path types to calculate slack values
● Set environmental constraints, clocks constraints, and path exceptions
● Constrain a design using SDC
● Analyze reports to identify timing problems
Implementing Useful Clock Skew Using Skew GroupsM Mei
Implementing useful skew through skew groups or manual buffer insertion can improve timing in a large memory block design. Skew groups define a target skew value for groups of clock pins before clock tree synthesis, resulting in a smaller clock tree, lower power increase, and less routing complexity compared to manual buffer insertion. Manual insertion precisely controls skew by adding buffers but dramatically increases clock cell count and power consumption versus skew groups. Both methods effectively improved setup timing for the memory block design.
This document discusses the key inputs required for the physical design phase of a VLSI chip, using Synopsys tools as an example. The main inputs are: (1) a gate-level netlist describing the logical connections, (2) libraries providing timing, power and physical information for standard cells and macros, (3) a technology file describing manufacturing details, (4) parasitic extraction files (TLU+) for timing analysis, and (5) constraints describing design objectives. Additional inputs include floorplanning guidelines, scenarios for optimization, and reference design methodologies. The goal of physical design is to implement the logic from the netlist while meeting area, timing and power targets.
Physical design involves taking a synthesized netlist as input and performing floorplanning, placement, and routing to produce a physical layout. Key inputs include the netlist, timing constraints, physical libraries, and technology files. The process involves floor planning to determine block placement and routing areas, power planning to create the power distribution network, and pre-routing of standard cells and power grids. The goal is to meet timing constraints while minimizing area.
https://www.udemy.com/vlsi-academy
Usually, while drawing any circuit on paper, we have only one 'vdd' at the top and one 'vss' at the bottom. But on a chip, it becomes necessary to have a grid structure of power, with more than one 'vdd' and 'vss'. The concept of power grid structure would be uploaded soon. It is actually the scaling trend that drives chip designers for power grid structure.
The document discusses the physical design process for VLSI circuits. It describes the main steps as partitioning, floor planning and placement, routing, layout optimization, and extraction and verification. The goals of physical design are to minimize signal delays, interconnection area, and power usage. Physical design transforms the logical structure of a circuit into its physical layout.
This document discusses engineering change orders (ECOs) used to fix timing, functional, power, and clock issues after physical design and sign-off. It describes the motivation for ECOs due to tool limitations and differences between implementation and sign-off. Common ECO techniques are listed for timing (driver upsizing, buffer insertion, etc.), power (vt-swapping, downsizing, etc.), and metal-only ECOs. Timing ECO tools from Synopsys, Cadence, and other vendors are also mentioned. Upcoming ECO technologies like dynamic power optimization and automatic legalization are noted.
Clock Tree Synthesis is a technique for distributing the clock equally among all sequential parts of a VLSI design. The purpose of Clock Tree Synthesis is to reduce skew and delay. Clock Tree Synthesis is provided the placement data as well as the clock tree limitations as input. Clock Tree Synthesis (CTS) is the technique of balancing the clock delay to all clock inputs by inserting buffers/inverters along the clock routes of an ASIC design. As a result, CTS is used to balance the skew and reduce insertion latency. Before Clock Tree Synthesis, all clock pins were driven by a single clock source. Clock tree synthesis includes both clock tree construction and clock tree balance. Clock tree inverters may be used to create a clock tree that maintains the correct transition (duty cycle), and clock tree buffers (CTB) can balance the clock tree to fulfil the skew and latency requirements. To fulfil the space and power limits, fewer clock tree inverters and buffers should be employed.
This is a custom GUI, which eases fixing violations either by adding buffer, cloning or sizing. Drop down menu item is created in ICC2 layout window. Desired terminals can be selected by dragging or adding points in rectilinear fashion and desired locations can be selected for adding new buffer.
The document provides an overview of the PrimeTime static timing analysis tool. It describes PrimeTime's capabilities for design checks and analysis, how it fits into the Synopsys implementation flow, its compatibility with other Synopsys tools, and an overview of static timing analysis concepts like timing paths. The document also discusses starting a PrimeTime session, generating input files, and important commands and reports in PrimeTime like report_timing, report_qor, and analysis_coverage_report.
The document discusses floor planning, which is the first step in physical design. It involves defining the size of the chip, pre-placing hard macros, I/O pads, and defining the power grid. A good floorplan partitions the design into functional blocks, arranges the blocks on the chip, places macros and I/O pads, and decides on the power distribution. Key inputs to floorplanning include the netlist, physical and timing libraries, timing constraints, and power requirements. The document then discusses various aspects of floorplanning such as die size calculations, macro placement guidelines, and different types of physical cells.
The document discusses physical design and placement optimization in Cadence tools. It covers prerequisites for placement, goals of optimization including timing, power and area. It describes placement flow and discusses pre-placement, in-placement and post-placement optimization stages. Key techniques covered include zero interconnect timing analysis, scan chain handling, pre-placement optimization, congestion-driven placement, and post-placement optimization before and after clock tree synthesis.
The document discusses low power design techniques in VLSI. It begins by explaining why low power has become important, especially with the rise of mobile devices. It then discusses the different sources of power consumption, including dynamic and static power. Several low power design techniques are covered, such as clock gating, multi-Vt libraries, multi-voltage design, and power gating. The document emphasizes analyzing power at the system level and using EDA tools to implement low power techniques throughout the design flow. Overall, it provides an overview of analyzing power consumption and the goals and methods of low power VLSI design.
Floorplanning is a critical part of the physical design process that determines the quality of the final design. Key aspects of floorplanning include macro placement and orientation, pad locations, power distribution, and standard cell placement. Good floorplanning avoids routing congestion and meets timing closure by considering pin locations, power networks, blockages, and cell placement regions. Macro placement should be optimized through flyline analysis to minimize interconnect lengths between blocks. Standard cells should be placed in homogeneous regions to improve routability.
This document provides an introduction to Verilog HDL including:
- An overview of Verilog keywords, data types, abstraction levels, and design methodology.
- Details on the history of Verilog including its development over time and transitions to newer standards.
- Explanations of key Verilog concepts like modules, ports, instantiation, stimuli, and lexical conventions.
Modules are the basic building blocks, ports define module interfaces, and instantiation replicates modules. Stimuli provide test inputs and lexical conventions cover syntax rules.
The document discusses timing closure in FPGA design flows. It explains that timing requirements include clock period/frequency, throughput, and latency. The timing-driven design flow in Lattice Diamond is outlined, highlighting key steps like defining timing constraints, running synthesis and implementation with timing analysis, and iterating to resolve issues. Timing constraints like input/output delays and exceptions are also covered.
Clock tree synthesis log messages provide information about:
1) Preprocessing steps like design updates, buffer characterization, and clock tree constraints.
2) The clock tree synthesis process which includes clustering, meeting timing targets, and reporting results.
3) Post processing steps like embedded clock tree optimization, DRC fixing, and placement legalization.
1. The document discusses the key steps in physical design flow, including import design, floorplanning, placement and routing.
2. Floorplanning is described as a critical step, where the quality of the floorplan can significantly impact timing closure and design implementation. Good techniques for floorplanning include understanding the design requirements and data flow.
3. The document outlines the major steps in floorplanning such as sizing and shaping blocks, voltage area creation, pin placement, row creation, macro placement, adding blockages and special cells. Qualifying the floorplan involves checks on pin grids, design rules, power connections and more.
In this course, you
● Identify and apply timing arc information from a library, such as unateness, delays, and slew
● Identify cell delays from a library and calculate output slew degradation
● Use wire-load information to calculate net delays
● Identify the properties of a clock, including period, edges, and slew, and calculate the duty cycle
● Apply setup and hold checks to diagnose design violations
● Identify timing path types to calculate slack values
● Set environmental constraints, clocks constraints, and path exceptions
● Constrain a design using SDC
● Analyze reports to identify timing problems
Implementing Useful Clock Skew Using Skew GroupsM Mei
Implementing useful skew through skew groups or manual buffer insertion can improve timing in a large memory block design. Skew groups define a target skew value for groups of clock pins before clock tree synthesis, resulting in a smaller clock tree, lower power increase, and less routing complexity compared to manual buffer insertion. Manual insertion precisely controls skew by adding buffers but dramatically increases clock cell count and power consumption versus skew groups. Both methods effectively improved setup timing for the memory block design.
This document discusses the key inputs required for the physical design phase of a VLSI chip, using Synopsys tools as an example. The main inputs are: (1) a gate-level netlist describing the logical connections, (2) libraries providing timing, power and physical information for standard cells and macros, (3) a technology file describing manufacturing details, (4) parasitic extraction files (TLU+) for timing analysis, and (5) constraints describing design objectives. Additional inputs include floorplanning guidelines, scenarios for optimization, and reference design methodologies. The goal of physical design is to implement the logic from the netlist while meeting area, timing and power targets.
Physical design involves taking a synthesized netlist as input and performing floorplanning, placement, and routing to produce a physical layout. Key inputs include the netlist, timing constraints, physical libraries, and technology files. The process involves floor planning to determine block placement and routing areas, power planning to create the power distribution network, and pre-routing of standard cells and power grids. The goal is to meet timing constraints while minimizing area.
https://www.udemy.com/vlsi-academy
Usually, while drawing any circuit on paper, we have only one 'vdd' at the top and one 'vss' at the bottom. But on a chip, it becomes necessary to have a grid structure of power, with more than one 'vdd' and 'vss'. The concept of power grid structure would be uploaded soon. It is actually the scaling trend that drives chip designers for power grid structure.
The document discusses the physical design process for VLSI circuits. It describes the main steps as partitioning, floor planning and placement, routing, layout optimization, and extraction and verification. The goals of physical design are to minimize signal delays, interconnection area, and power usage. Physical design transforms the logical structure of a circuit into its physical layout.
This document discusses engineering change orders (ECOs) used to fix timing, functional, power, and clock issues after physical design and sign-off. It describes the motivation for ECOs due to tool limitations and differences between implementation and sign-off. Common ECO techniques are listed for timing (driver upsizing, buffer insertion, etc.), power (vt-swapping, downsizing, etc.), and metal-only ECOs. Timing ECO tools from Synopsys, Cadence, and other vendors are also mentioned. Upcoming ECO technologies like dynamic power optimization and automatic legalization are noted.
Clock Tree Synthesis is a technique for distributing the clock equally among all sequential parts of a VLSI design. The purpose of Clock Tree Synthesis is to reduce skew and delay. Clock Tree Synthesis is provided the placement data as well as the clock tree limitations as input. Clock Tree Synthesis (CTS) is the technique of balancing the clock delay to all clock inputs by inserting buffers/inverters along the clock routes of an ASIC design. As a result, CTS is used to balance the skew and reduce insertion latency. Before Clock Tree Synthesis, all clock pins were driven by a single clock source. Clock tree synthesis includes both clock tree construction and clock tree balance. Clock tree inverters may be used to create a clock tree that maintains the correct transition (duty cycle), and clock tree buffers (CTB) can balance the clock tree to fulfil the skew and latency requirements. To fulfil the space and power limits, fewer clock tree inverters and buffers should be employed.
This is a custom GUI, which eases fixing violations either by adding buffer, cloning or sizing. Drop down menu item is created in ICC2 layout window. Desired terminals can be selected by dragging or adding points in rectilinear fashion and desired locations can be selected for adding new buffer.
The document provides an overview of the PrimeTime static timing analysis tool. It describes PrimeTime's capabilities for design checks and analysis, how it fits into the Synopsys implementation flow, its compatibility with other Synopsys tools, and an overview of static timing analysis concepts like timing paths. The document also discusses starting a PrimeTime session, generating input files, and important commands and reports in PrimeTime like report_timing, report_qor, and analysis_coverage_report.
The document discusses floor planning, which is the first step in physical design. It involves defining the size of the chip, pre-placing hard macros, I/O pads, and defining the power grid. A good floorplan partitions the design into functional blocks, arranges the blocks on the chip, places macros and I/O pads, and decides on the power distribution. Key inputs to floorplanning include the netlist, physical and timing libraries, timing constraints, and power requirements. The document then discusses various aspects of floorplanning such as die size calculations, macro placement guidelines, and different types of physical cells.
The document discusses physical design and placement optimization in Cadence tools. It covers prerequisites for placement, goals of optimization including timing, power and area. It describes placement flow and discusses pre-placement, in-placement and post-placement optimization stages. Key techniques covered include zero interconnect timing analysis, scan chain handling, pre-placement optimization, congestion-driven placement, and post-placement optimization before and after clock tree synthesis.
The document discusses low power design techniques in VLSI. It begins by explaining why low power has become important, especially with the rise of mobile devices. It then discusses the different sources of power consumption, including dynamic and static power. Several low power design techniques are covered, such as clock gating, multi-Vt libraries, multi-voltage design, and power gating. The document emphasizes analyzing power at the system level and using EDA tools to implement low power techniques throughout the design flow. Overall, it provides an overview of analyzing power consumption and the goals and methods of low power VLSI design.
Floorplanning is a critical part of the physical design process that determines the quality of the final design. Key aspects of floorplanning include macro placement and orientation, pad locations, power distribution, and standard cell placement. Good floorplanning avoids routing congestion and meets timing closure by considering pin locations, power networks, blockages, and cell placement regions. Macro placement should be optimized through flyline analysis to minimize interconnect lengths between blocks. Standard cells should be placed in homogeneous regions to improve routability.
This document provides an introduction to Verilog HDL including:
- An overview of Verilog keywords, data types, abstraction levels, and design methodology.
- Details on the history of Verilog including its development over time and transitions to newer standards.
- Explanations of key Verilog concepts like modules, ports, instantiation, stimuli, and lexical conventions.
Modules are the basic building blocks, ports define module interfaces, and instantiation replicates modules. Stimuli provide test inputs and lexical conventions cover syntax rules.
The VLSI design flow consists of three domains - behavioral, structural, and physical - and multiple levels from system to circuit level. The front-end design includes logic synthesis to generate a netlist from HDL code through technology mapping and optimization. Back-end physical design involves floorplanning, placement of cells, routing of interconnects, and simulation to verify functionality and timing.
This document provides an overview of an "Analog VLSI Design" course. The goals of the course are to introduce principles of analog integrated circuit design and CMOS technology. Students will learn about CMOS layout design using CAD tools and complete a design project. The course covers topics including CMOS technology, resistors, capacitors, MOSFETs, current mirrors, amplifiers, and data converters. Assessment includes homework, a project, and a final exam.
The document provides an overview of analog layout design. It discusses that analog circuits require careful attention to geometry during layout due to process variations. The analog design flow includes electrical design, physical design involving layout, and fabrication/testing. Key considerations for analog layout include minimizing parasitic resistances and capacitances, reducing noise, and ensuring matching between identical components using techniques like common-centroid layout. Resistors and capacitors must be carefully laid out to minimize non-ideal effects and provide accurate values.
VLSI refers to very large scale integration in electronics, involving the integration of millions of transistors on a single chip. The document discusses the history and evolution of integration levels from SSI to VLSI to ULSI. It describes the CMOS fabrication process and design styles used in VLSI. Key phases in chip creation are design, fabrication, testing and packaging. Advanced computer-aided design tools are needed to design complex VLSI circuits. Applications include analog, ASIC and system-on-chip designs. Challenges to VLSI include power dissipation and scaling issues as integration increases. The future of VLSI involves continued device miniaturization and increasing transistor densities on chips.
Cadbridge Semiconductor is an emerging electronics company with offices in Greater Noida and Jalander that works on projects involving memories, PCB design, digital security locks, robots, image processing, and microcontrollers. The company's vision is to hire and develop the best talent worldwide in a multicultural environment. The VLSI design flow presented includes idea conception, specification, design architecture, RTL coding, RTL verification, synthesis, sending to a foundry, and producing an IC chip. Application areas of VLSI discussed were microprocessors, memories, and mobile devices.
This document outlines the course contents for a VLSI Design course. The course covers six units: (1) an introduction to VLSI design including Moore's Law and design challenges, (2) VLSI circuit design processes and technologies, (3) analysis of CMOS logic circuits, (4) advanced CMOS logic circuit techniques, (5) memories, and (6) testing and testability. The goal of the course is to provide students with knowledge of very large scale integration circuits, which are essential components in modern electronic devices.
The document discusses VLSI design automation which involves converting an electrical circuit specification into a geometric layout using computers. The layout consists of geometric shapes in different layers which are used to produce photolithographic masks for fabricating chips. Physical design is the process of converting a circuit into a layout and involves steps like logic design, circuit design and placement and routing of components on the layout. Automation tools help implement the complex physical design process.
This document outlines the key steps in VLSI design techniques, including system specification, functional design, logic design, circuit design, physical design, fabrication, and packaging. It discusses the history of integrated circuits and Moore's Law. The physical design cycle is described in more detail, including circuit partitioning, floorplanning, placement, routing, compaction, and verification. Finally, different design styles like full custom, standard cell, and gate array are compared.
The document discusses VLSI design and a high-speed parallel multiplier project. It begins with an introduction to VLSI design including its history and various integrations from SSI to VLSI. It then provides an overview and motivation for the multiplier project. The project aims to implement efficient high-speed multiplication using Booth encoding, Wallace tree adders, and carry look-ahead adders to reduce the number of partial products and accelerate their accumulation. The document outlines the organization of the project report and chapters on Booth algorithms, Wallace trees, and carry look-ahead addition.
Short.course.introduction.to.vhdl for beginners Ravi Sony
This document provides an introduction to VHDL (VHSIC Hardware Description Language). It discusses modeling and different levels of abstraction in modeling. It describes the design flow from idea to fabrication. It gives examples of architectural design, data path design, control path design, and register allocation. It discusses high-level synthesis and the tasks of scheduling and allocation. Finally, it provides some historical context and applications of hardware description languages.
This document discusses digital VLSI design flows. It begins by acknowledging previous work that informed the presentation. It then discusses considerations in developing an electronic system, including components of the system. It describes integrated circuits based on application, fabrication technology, device, and device count. It discusses using standard or application-specific integrated circuits. It outlines a top-down design approach and terminology used in the design flow.
This document provides an introduction to VLSI design. It begins by defining VLSI as circuits containing over a million switching devices or logic gates. It then discusses the evolution of integrated circuits from SSI to VLSI and the trends in IC technology. The key advantages of MOS technology over BJT are summarized. The document outlines Moore's Law and provides evidence of its accuracy. It introduces the structured design methodology and top-down, bottom-up approaches. The various stages of the VLSI design flow and physical design cycle are described at a high level. Different design styles including full-custom, standard cell-based, and programmable logic are also summarized.
The document discusses various aspects of physical design in VLSI circuits. It describes the physical design cycle which involves transforming a circuit diagram into a layout through steps like partitioning, floorplanning, placement, routing, and compaction. It also discusses different design styles like full-custom, standard cell, and gate array. Full-custom design allows maximum flexibility but has higher complexity, while restricted models like standard cell and gate array simplify the design process at the cost of less optimization in the layout. Physical design aims to produce layouts that meet timing and area constraints.
The document describes the basic ASIC design flow. It begins with system specification and proceeds through architectural design, functional design, register transfer level design, logic design, circuit design, layout, and verification and testing. However, the document notes that the design flow is not strictly linear and there can be interactions between stages that require going back to earlier stages. Timing closure is identified as resolving any timing issues that arise through iterations between physical design and earlier stages.
VLSI design involves integrating millions of transistors onto a single chip. There are various design styles including full custom, standard cell, gate array, and FPGA. Full custom designs have fully customized cells and layouts but require more design time. Standard cell and gate array styles use predesigned cells, reducing design time but only customizing interconnect layers. FPGA designs have no custom masks and the fastest design turnaround time.
Performance and Flexibility for Mmultiple-Processor SoC DesignYalagoud Patil
Concepts, limitations of traditional ASIC design
Extensible processors as an alternative to RTL
Toward multiple-processor SoCs
Processors and disruptive technology
Conclusions
This document provides an overview of Module 1 of the ECIE 4343 Very Large Scale Integrated Circuits (VLSI) Design course. The module introduces course logistics, content, and design implementation options. It outlines topics that will be covered including VLSI economy, MOSFET characteristics, circuit layout, fabrication, and CAD tools. A course schedule is provided listing weekly topics and assignments. Assessment breakdown consists of a final exam, project, midterm, and assignments/quizzes. Historical trends in transistor size reduction and integrated circuit scaling are reviewed.
https://technoelectronics44.blogspot.com/
GDI TECHNOLOGY, here you get GDI implementation and design of GDI based gates AND, OR, XOR, and Adders like CLA, CIA, CSKA, performance analysis of CMOS And GDI
This document provides an introduction to VHDL (VHSIC Hardware Description Language). It discusses what VHDL is used for, including modeling digital systems at different levels of abstraction, design specification, documentation, verification through simulation, test generation, and hardware synthesis. The document outlines the design flow process from initial idea to physical design. It provides examples of modeling behavioral and structural designs in VHDL and using VHDL for register transfer level logic design.
This document provides an overview of an ASIC/FPGA technology and design flow course. It discusses the course organization, material, schedule, and recommended literature. The course will cover FPGA and ASIC design flows, including Verilog, synthesis, simulation, and implementation. It will also discuss chip structures, technologies, applications and the semiconductor industry. Students will complete projects to design an FPGA peripheral and an ASIC, with design reviews to mimic industry practice. The goal is to prepare students for careers in chip design and verification.
This document discusses the basics of Very Large Scale Integration (VLSI) design. It begins with a brief history of transistors and integrated circuits. It then covers Moore's Law and the evolution of logic complexity in integrated circuits from single transistors to today's ultra-large scale integration. The rest of the document discusses VLSI design methodologies, including the design flow from behavioral to layout representations using a Y-chart. It emphasizes concepts like regularity, modularity, and locality to manage complexity in VLSI designs.
VLSI DESIGN
The document discusses VLSI (Very Large Scale Integration) design. It begins by defining VLSI as integrating thousands of transistors into a single chip. It then discusses the evolution of integration levels from SSI to VLSI and beyond. The rest of the document outlines the VLSI design flow including system specification, architectural design, functional design, logic design, circuit design, physical design, fabrication, packaging and testing. Transistor modeling considerations and basic MOS transistor operation modes such as cut-off, triode and saturation are also summarized.
System on Chip is a an IC that integrates all the components of an electronic system. This presentation is based on the current trends and challenges in the IP based SOC design.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Thinking of getting a dog? Be aware that breeds like Pit Bulls, Rottweilers, and German Shepherds can be loyal and dangerous. Proper training and socialization are crucial to preventing aggressive behaviors. Ensure safety by understanding their needs and always supervising interactions. Stay safe, and enjoy your furry friends!
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
How to Build a Module in Odoo 17 Using the Scaffold MethodCeline George
Odoo provides an option for creating a module by using a single line command. By using this command the user can make a whole structure of a module. It is very easy for a beginner to make a module. There is no need to make each file manually. This slide will show how to create a module using the scaffold method.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
1. Chapter 1:
Introduction to VLSI Physical
Design
Sadiq M. Sait & Habib Youssef
King Fahd University of Petroleum & Minerals
College of Computer Sciences & Engineering
Department of Computer Engineering
September 2003
Chapter 1: Introduction to VLSI Physical Design – p.1
2. Introduction
Present day VLSI technology permits us to build systems with
hundreds of thousands of transistors on a single chip.
For example:
• The Intel 80286 microprocessor has over 105
transistors.
• The 80386 has 275,000 transistors.
• The 80486 has approximately 106
, transistors.
• The RISC processor from National Semiconductor
NS32SF641 has over 106
transistors.
• The Pentium processor has over 3 × 106
transistors.
Chapter 1: Introduction to VLSI Physical Design – p.2
3. Introduction-contd
ICs of this complexity would not have been possible without
computer programs which automate most design tasks.
• Designing a VLSI chip with the help of computer
programs is known as CAD.
• Design Automation (DA), on the other hand, refers to
entirely computerized design process with no or very
little human intervention.
• CAD and DA research has a long history of over three
decades.
Chapter 1: Introduction to VLSI Physical Design – p.3
4. Introduction-contd
As technology has changed from SSI to VLSI:
• The demand for DA has escalated.
• The types of DA tools have multiplied due to changing
needs.
• There has been a radical change in design issues.
• Due to sustained research by a number of groups,
sophisticated tools are available for designing ICs, and
we are briskly moving towards complete DA.
Chapter 1: Introduction to VLSI Physical Design – p.4
5. Physical Design
• Physical design is the process of generating the final
layout for the circuit.
• This is a very complex task.
• In order to reduce the complexity several intermediate
levels of abstractions are introduced.
• More and more details are introduced as the design
progresses from highest to lowest levels of abstractions.
• Typical levels of abstractions together with their
corresponding design steps are illustrated in Figure.
Chapter 1: Introduction to VLSI Physical Design – p.5
6. Levels of abstraction
CAD subproblem level
Behavioral/Architectural
Register transfer/logic
Cell/mask
Generic CAD tools
Behavioral modeling and
Simulation tool
Tools for partitioning,
placement, routing, etc.
Functional and logic minimization,
logic fitting and simulation tools
Idea
Architectural design
Logical design
Physical design
Fabrication
New chip
Figure 1: Levels of abstraction & corresponding de-
sign step.
Chapter 1: Introduction to VLSI Physical Design – p.6
7. Logical & Architectural Design
• As indicated the design is taken from specs to fabrication
step by step with the help of CAD tools.
• Architectural design of a chip is carried out by expert
human engineers.
• Decisions made at this stage affect the cost and
performance of the design significantly.
• Once the system architecture is defined, it is necessary to
carry out two things:
(a) Detailed logic design of individual circuit modules.
(b) Derive the control signals necessary to activate and deactivate the
circuit modules.
• The first step is known as data path design.
• The second step is called control path design.
Chapter 1: Introduction to VLSI Physical Design – p.7
8. Example
It is required to design an 8-bit adder. The two operands are
stored in two 8-bit shift registers A and B. At the end of the
addition operation, the sum must be stored in A. The contents
of B must not be destroyed. The design must be as economical
as possible in terms of hardware.
MUX A
MUX B
Q D
SA
S
MA
BM
B
inD
FA
Cout
S
BM
MA
SB
Read A
Read B
RC
RD
Add
load B
load A
Clock
Start
inC
(a) (b)
A
S
Figure 2: Organization of a serial adder: (a) Data Path
(b) Control path block diagram. Chapter 1: Introduction to VLSI Physical Design – p.8
9. Example-contd
• There are numerous ways to design the above circuit.
• Since it is specified that the hardware cost must be
minimum, it is perhaps best to design a serial adder.
• The organization of such an adder is shown in figure.
• The relevant control signals are tabulated below.
SA Shift the register A right by one bit
SB Shift the register B right by one bit
MA Control multiplexer A
MB Control multiplexer B
RD Reset the D flip-flop
RC Reset the counter
START A control input, which & commences the addition
Chapter 1: Introduction to VLSI Physical Design – p.9
10. Example-contd
• The control algorithm for adding A and B is given below.
forever do
while (START = 0) skip;
Reset the D flip-flop and the counter;
Set MA and MB to 0;
repeat
Shift registers A and B right by one;
counter = counter + 1;
until counter = 8;
Chapter 1: Introduction to VLSI Physical Design – p.10
11. High-level Synthesis
• Several observations can be made by studying the
example of the serial-adder.
• First, note that designing a circuit involves a trade-off
between cost, performance, and testability.
• The serial adder is cheap in terms of hardware, but slow
in performance.
• It is also more difficult to test the serial adder, since it is a
sequential circuit.
• The parallel 8-bit CLA is likely to be fastest in terms of
performance, but costliest in hardware.
Chapter 1: Introduction to VLSI Physical Design – p.11
12. High-level Synthesis-contd
• All the different ways that we can think of to build an
8-bit adder constitute what is known as the design space
(at that particular level of abstraction).
• Each method of implementation is called a point in the
design space.
• There are advantages and disadvantages associated with
each design point.
• When we try optimizing the hardware cost, we usually
lose out on performance, and vice versa.
• There are many more design aspects, such as power
dissipation, fault tolerance, ease of design, and ease of
making changes to the design.
Chapter 1: Introduction to VLSI Physical Design – p.12
13. High-level Synthesis-contd
• A circuit specification may pose constraints on one or
more aspects of the final design.
• For example, when the specification says that the circuit
operate at a minimum of 15 MHz, we have a constraint
on the timing performance.
• Given a specification, the objective is to arrive at a design
which meets all the constraints posed by the specification,
and optimizes on one or more of the design aspects.
• This problem is also known as hardware synthesis.
• Computer programs have been developed for data path
synthesis as well as control path synthesis.
• The automatic generation of data path and control path is
known as high-level synthesis.
Chapter 1: Introduction to VLSI Physical Design – p.13
14. Logic Design
• The data path and control path will have components
such as arithmetic/logic units, shift registers,
multiplexers, buffers, etc.
• Further design steps depend on the following factors.
(1) How is the circuit to be implemented, on a PCB or as
a VLSI chip?
(2) Are all the components available as off-the-shelf ICs
circuits or as predesigned modules?
• If the circuit must be implemented on a PCB using
off-the-shelf components, then the next stage is to select
the components.
Chapter 1: Introduction to VLSI Physical Design – p.14
15. Logic Design-contd
• Following this, the ICs are placed on boards and the
necessary interconnections are established.
• A similar procedure may be used in case the circuit is
implemented on a VLSI.
• These modules are also known as macro-cells.
• The cells must be placed on the layout surface and wired
together using metal and polysilicon (poly)
interconnections.
Chapter 1: Introduction to VLSI Physical Design – p.15
16. Physical Design
• Physical design of a circuit is the phase that precedes the
fabrication of a circuit.
• In most general terms it refers to all synthesis steps
succeeding logic design and preceding fabrication.
• These include all or some of the following steps:
1. Circuit Partitioning.
2. Floorplanning and Channel Definition.
3. Circuit Placement.
4. Global Routing.
5. Channel Ordering.
6. Detailed routing of power and ground nets.
7. Channel and Switchbox Routing.
Chapter 1: Introduction to VLSI Physical Design – p.16
17. Physical Design-contd
• The performance of the circuit, its area, its yield, and its
reliability depend on the layout.
• Long wires and vias affect the performance and area of
the circuit.
• The area of a circuit also has a direct influence on the
yield of the manufacturing process.
Chapter 1: Introduction to VLSI Physical Design – p.17
18. Layout Styles
• These approaches differ mainly in the structural
constraints they impose on the layout elements and the
layout surface.
• They belong to two general classes:
(a) The full-custom layout approach.
(b) The semi-custom approaches.
• Current layout styles are:
1. Full-custom.
2. Gate-array design style.
3. Standard-cell design style.
4. Macro-cell (Building block layout).
5. PLA (Programmable Logic Array), and
6. FPGA (Field Programmable Gate-Array) layout.
Chapter 1: Introduction to VLSI Physical Design – p.18
19. Full-Custom Layout
• Full-custom layout refers to manual layout design.
• Full-custom design is a time-consuming and difficult task.
• Gives full control to the artwork designer in
placing/interconnecting.
• A high degree of optimization in both the area and
performance is possible.
• Takes several man-months to layout a chip.
• Therefore is used only for circuits that are mass produced
(microprocessors).
• For circuits which will be reproduced in millions, it is
important to optimize on the area as well as performance.
• Designers productivity is increased with the help of a
good layout editor. Chapter 1: Introduction to VLSI Physical Design – p.19
20. Gate-Array Layout
• A gate-array (MPGAs) consists of transistors
prefabricated on a wafer in the form of a regular 2-D
array.
• Initially the transistors in an array are not connected to
one another.
• In order to realize a circuit on a gate-array, metal
connections must be placed using the usual process of
masking (personalizing).
• Short fabrication time (only four processing steps).
• Low cost of production due to yield.
• Limited wiring space, therefore present difficulties to automatic
layout generator.
Chapter 1: Introduction to VLSI Physical Design – p.20
21. Gate-Array Layout-contd
• A special case of the gate-array architecture is when
routing channels are very narrow, or virtually absent is
called Sea of Gates (Channel-less Gate-Arrays).
• A typical gate-array cell personalized as a two-input
NAND gate is shown in Figure.
Chapter 1: Introduction to VLSI Physical Design – p.21
22. Gate-Array Layout-contd
nMOS pMOSGND Vdd nMOS pMOSGND Vdd
A
BB
A
out
(a) (b)
Figure 3: (a) Example of a basic cell in a gate array (b)
Cell personalized as a two-input NAND gate.
Chapter 1: Introduction to VLSI Physical Design – p.22
24. Standard Cell Layout
• A standard cell, known also as a polycell, is a logic that
performs a standard function.
• Examples of standard-cells are two-input NAND gate,
two-input XOR gate, D flip-flop, two-input multiplexer.
• A cell library is a collection of information pertaining to
standard-cells.
• The relevant information about a cell consists of its name,
functionality, pin structure, and a layout for the cell in a
particular technology such as 2µm CMOS.
• Cells in the same library have standardized layouts, i.e.,
all cells are constrained to have the same height.
• Description of an inverter logic module named i1s.
Focus only on the profile, termlist, and
siglist statements. Chapter 1: Introduction to VLSI Physical Design – p.24
25. Standard Cell Layout
cell begin i1s generic=i1 primitive=INV area=928.0 transistors=2
function="q = INV((a))"
logfunction=invert
profile top (-1,57) (15,57); profile bot (-1,-1) (15,-1);
termlist
a { (1-4,-1) (1-4,57) }
pintype=input
rise_delay=0.35 rise_fan=5.18 fall_delay=0.28 fall_fan=3.85
loads=0.051 unateness=INV; q { (9-12,-1) (9-12,57) }
pintype=output;
siglist GND Vdd a q ;
translist
m0 a GND q length=2000 width=7000 type=n
m1 a Vdd q length=2000 width=13000 type=p ;
caplist
c0 Vdd GND 2.000f
c1 q GND 5.000f
c2 Vdd a 2.000f
c3 a GND 11.000f ;
cell end i1s
Chapter 1: Introduction to VLSI Physical Design – p.25
27. Cell-Based Design
• Similar to designing a circuit using SSI and MSI
components.
• Selection is now from a cell-library, and components are
placed in silicon instead of PCB.
• Advantage: Designs can be completed rapidly.
• The Layout program will only be concerned with:
(1) the location of each cell; and
(2) interconnection of the cells.
• Placement and routing is again simplified using a
standard floorplan (see Figure).
• The disadvantage in relation to gate-array is that all the
fabrication steps are necessary to manufacture.
Chapter 1: Introduction to VLSI Physical Design – p.27
29. Macro-cell Layout
• No restrictions as in gate-array and standard-cell design.
• The cells can no longer be placed in a row-based
floorplan.
• This design style is called macro-cell design style, or
building-block design style.
Chapter 1: Introduction to VLSI Physical Design – p.29
30. Macro-cell Layout-contd
1
2
3
4
5
6 7
2
1
3
4
5 6
(a) (b)
7
Figure 7: (a) Cells of varying heights and widths
placed in a row-based floorplan (b) A more compact
floorplan for the same circuit. Chapter 1: Introduction to VLSI Physical Design – p.30
31. Macro-cell Layout-contd
Advantages:
• Cells of significant complexity are permitted in the library (registers,
ALUs, etc).
• Building-block layout (BBL) comes closest to full-custom layout.
• Like standard-cell layout style, all the processing steps are required to
manufacture a BBL chip.
Disadvantages:
• It is much more difficult to design layout programs for the BBL design
style.
• This is because there is no standard floorplan to adhere to. As a result,
the routing channels are not predefined either.
• Floorplanning and channel definition are additional steps required in a
BBL layout system.
Chapter 1: Introduction to VLSI Physical Design – p.31
32. FPGA layout
• Similar to an MPGA, an FPGA also consists of a 2-D
array of logic blocks.
• Each logic block (CLB) can be programmed to
implement any logic function of its inputs.
• In addition to this, the channels or switchboxes contain
interconnection resources.
• They contain programmable switches that serve to
connect the logic blocks to the wire segments, or one wire
segment to another.
• Furthermore, I/O pads are also programmable to be either
input or output pads.
Chapter 1: Introduction to VLSI Physical Design – p.32
33. FPGA layout-contd
Logic blocks Interconnect
Pads
Figure 8: Diagram of a typical FPGA.
Chapter 1: Introduction to VLSI Physical Design – p.33
34. FPGA layout-contd
• The main design steps when using FPGAs to implement
digital circuits are:
1. Technology Mapping,
2. Placement,
3. Routing, and finally,
4. Generating the bit patterns.
• The main disadvantages are their lower speed of
operations and lower gate density.
• FPGAs are most ideally suited for prototyping
applications, and implementation of random logic using
PALs.
Chapter 1: Introduction to VLSI Physical Design – p.34
35. Difficulties in Physical Design
• Physical design is a complex optimization problem, involving several
objective functions.
• Some of these objectives are conflicting.
• It is therefore customary to adopt a stepwise approach and subdivide
the problem (e.g., Circuit Partitioning, Floorplanning, etc.).
• All of the aforementioned subproblems are constrained optimization
problems.
• Unfortunately these layout subproblems (even simplified versions) are
NP-Hard.
• Therefore, instead of optimal enumerative techniques, heuristics are
used.
• Solution quality of heuristics is determined using artificial inputs whose
optimal solutions are known or using test inputs comprising of real
circuits, called benchmarks, (MCNC, ISCAS).
Chapter 1: Introduction to VLSI Physical Design – p.35
36. Terminology and Definitions
• A cell.
• A macro-cell.
• The aspect ratio of a cell.
• Logic module, or module, refers to macro or standard cells.
• A module interfaces to other modules through pins.
• A signal net, or simply net, is a collection of pins.
• A netlist description is, as the name suggests, a list of all the nets in the
circuit.
• A graph is an abstract representation.
• The connectivity information can be represented in the form of an
n × n matrix C.
Chapter 1: Introduction to VLSI Physical Design – p.36
38. Full-Adder-contd
AND[1]
AND[2]
AND[3]
1 4
2 5 7 8
3 6
A
B
C
OR3[1] Z
Figure 10: The connectivity graph for the full-adder
carry circuit.
Chapter 1: Introduction to VLSI Physical Design – p.38
40. Full-Adder-contd
• Manhattan distance between the two pins located at
coordinates (x1, y1) and (x2, y2), is given by:
d12 = |x1 − x2| + |y1 − y2|(1)
A
B (5,12)
C (10,7)
A (5,2)
5,7
B
C
(a) (b)
Figure 12: (a) A minimum spanning tree (b) Steiner
tree. Chapter 1: Introduction to VLSI Physical Design – p.40
41. Conclusion
• In this session we introduced the basic concepts of VLSI
physical design and Design Automation.
• In order to automate the layout procedure, it is common
to impose restrictions on the layout architecture.
• Several layout architectures are popular.
• In order to reduce the complexity the layout process is
broken into a sequence of physical design phases.
• The important design phases were presented.
• Each of these phases amounts to solving a combinatorial
optimization problem.
Chapter 1: Introduction to VLSI Physical Design – p.41
42. Conclusion
• Table below assesses and compares several aspects of the
various layout styles.
Comparison of Layout styles. The number in parentheses
indicates a rank to grade the layout style in comparison to
others in the same category.
Design Appl Design Fab Cost Performance
Style time Effort
High
F-Custom volume High(4) High(2) High(4) High(4)
Gate-array ASICs Low(2) Low(1) Low(2) Low(4)
Stan-cell ASICs Low(3) High(2) Low(3) High(1)
Macro-cell General High(1) High(2) Low(3) High(2)
FPGA ASICs Low(1) Nil Low(1) Low(1)
Chapter 1: Introduction to VLSI Physical Design – p.42