Digital Systems Design
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1 Digital Systems Design Digital Systems Design and Test Dr. D. J. Jackson Lecture 1-1 Introduction Traditional digital design Manual process of designing and capturing circuits Schematic entry System-level design Top-down design Required due to design complexity Rapid time-to-market requirements Hardware Description Language (HDL) use Synthesis Use a hardware compiler to implement a design Applicable to different digital product types ASIC, CPLD, FPGA, etc. Dr. D. J. Jackson Lecture 1-2 1
2 Top-down HDL Design Methodology Increased productivity Shorter development cycle More product features Reduced time-to-market Reduced non-recurring engineering (NRE) costs Design reuse facilitated Flexibility in design changes Rapidly explore alternatives Architectures Implementation technologies Dr. D. J. Jackson Lecture 1-3 Other Design Methodology Considerations Bottom-up design Design simple components Test desired functionality Integrate into larger designs Questions/Concerns? How are software versus hardware distinctions made? Hardware and software designed concurrently Hardware/software codesign Hardware/software codesign can coexist with a top-down or bottom-up design methodology Dr. D. J. Jackson Lecture 1-4 2
3 ASIC, FPGA and SoC Devices Standard off-the-shelf integrated circuits have fixed functionality defined by the chip manufacturer ASIC and FPGA ASIC functionality fixed by the designer for a particular application FPGA is field programmable by the designer Structured ASICs Some lower levels of the device are prefabricated Upper levels are based on a given (user) design Mix between ASIC and FPGA System-On-Chip (SoC) devices are typically a combination of some programmable fabric (FPGA) and a processor (ARM architecture is very popular) Altera Cyclone V SoC is one example Dr. D. J. Jackson Lecture 1-5 FPGA The field-programmable gate array (FPGA) is completely manufactured by the IC vendor The device is design independent Each manufacturer has their own proprietary architecture for their devices that includes Programmable blocks connected to Programmable switch matrices A device is configured to implement a particular design by programming the switch matrices to route signals between programmable logic blocks Dr. D. J. Jackson Lecture 1-6 3
4 Basic FPGA Device Structure Dr. D. J. Jackson Lecture 1-7 ASIC versus FPGA ASIC devices have an initial NRE cost After the initial cost, the per unit cost can be low FPGA devices typically have a higher unit cost than ASIC devices If production volume is low then FPGA is probably the implementation choice For high volume devices, ASICs are more cost effective For the same design, ASICs will generally hold a performance advantage over FPGAs Alternately FPGA may be used in prototyping and ASIC used in high volume production Dr. D. J. Jackson Lecture 1-8 4
5 Top-down Design Methodology System Algorithm Increasing behavioral abstraction Architecture RTL Increasing detail and complexity Gate Transistor Dr. D. J. Jackson Lecture 1-9 Example Design Flow Dr. D. J. Jackson Lecture
6 Design Domains Behavioral level of abstraction System Algorithm RTL Logic Gate Design Model Domain Abstract Structural Physical Architecture synthesis Architectural Design RTL synthesis verification Structural Design verification Logic Design verification Logic synthesis Layout Design Dr. D. J. Jackson Lecture 1-11 Electronic Design Automation Tools An EDA system usually includes the following tools Design entry Synthesis and optimization Simulation Physical design Dr. D. J. Jackson Lecture
7 Design entry The process of entering into the CAD system a description of a circuit being designed is called design entry Common design entry methods Schematic capture User graphically enters a desired logic circuit Hardware description languages User enters a programming language-like description of a desired logic circuit Dr. D. J. Jackson Lecture 1-13 Schematic capture Schematic: refers to a diagram of a circuit in which circuit elements (logic gates) are shown as graphical symbols and connections between them are drawn as lines Tool provides a collection of symbols that represent gates of various types with different inputs and outputs. A library. Previously designed circuits can be represented with a graphical symbol and used in larger circuits. Known as hierarchical design and provides a way of dealing with complexities of large circuits Dr. D. J. Jackson Lecture
8 Hierarchical Design Dr. D. J. Jackson Lecture 1-15 Hardware description languages A hardware description language (HDL) is, on the surface, similar to a computer program except that it is used to describe hardware Common HDLs VHDL (VHSIC Hardware Description Language) Verilog Many others (vendor specific) VHDL and Verilog are standards Offer the option for portability across different CAD tools and different types of programmable chips Dr. D. J. Jackson Lecture
9 Synthesis Synthesis CAD tools perform the process of generating a logic circuit from some stated functional behavior Translating (compiling) VHDL code into a network of logic gates is a part of synthesis Not only will the CAD tool produce a logic circuit, but it can also optimize that circuit In terms of speed and/or size (logic optimization) Called logic synthesis or logic optimization Finally, technology mapping and layout synthesis (physical design) complete the synthesis process Dr. D. J. Jackson Lecture 1-17 Simulation Once designed, it is necessary to verify that the design circuit functions as expected In a functional simulation the user specifies valuations of the circuits inputs and the CAD tool generates the outputs (commonly in the form of a timing diagram) User verifies generated outputs against expected outputs Functional simulators assume the time needed for signals to propagate through the logic gates is negligible Sometimes called zero-delay simulators For a real implementation this is not sufficient Use a timing simulator, or other timing analysis tool, to obtain accurate (complete) simulation Dr. D. J. Jackson Lecture
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