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This book is a result of many years of teachinga senior course in digital systems design atthe University of Texas at Austin. Intended fora senior-level course, the book covers bothbasic principles of digital systems design andthe use of hardware description language,VHDL, in the design process. Emphasis isplaced on teaching by example and for thisreason, many digital system design examples,ranging in complexity from a simple binaryadder to a microprocessor, are included CDROMin the text. All of the VHDL code in thistextbook has been tested using the Modelsimsimulator. Key Features Because students typically need a review of the basics of logic design, Chapter 1 includes a review of logic design fundamentals. Most students can review this material on their own, so it is unnecessary to devote much lecture time to this chapter Emphasis is placed on the basic features that are necessary for digital design and omit some of the less-used features Material is presented in a generalized fashion, with references to specific products as examples, to enhance understanding of the basic principles in the construction of programmable devices A variety of examples are presented so that instructors can select their favorite designs for teaching Table Of Contents 1. Review of Logic Design Fundamentals Combinational Logic Boolean Algebra and Algebraic Simplification Karnaugh Maps Designing with NAND and NOR Gates Hazards in Combinational Circuits Flip-Flops and Latches Mealy Sequential Circuit Design Design of a Moore Sequential Circuit Equivalent States and Reduction of State Tables Sequential Circuit Timing Tristate Logic and Busses 2. Introduction to VHDL Computer-Aided Design Hardware Description Languages VHDL Description of Combinational Circuits VHDL Modules Sequential Statements and VHDL Processes Modeling Flip-Flops Using 3. VHDL Processes Processes Using Wait Statements Two Types of VHDL Delays: Transport and Inertial Delays Compilation, Simulation, and Synthesis of VHDL Code VHDL Data Types and Operators Simple Synthesis Examples VHDL Models for Multiplexers VHDL Libraries Modeling Registers and Counters Using VHDL Processes Behavioral and Structural VHDL Variables, Signals, and Constants Arrays 4. Design Examples BCD to 7-Segment Display Decoder A BCD Adder 32-Bit Adders Traffic Light Controller State Graphs for Control Circuits Scoreboard and Controller Synchronization and Debouncing A Shift-and-Add Multiplier Array Multiplier A Signed Integer/Fraction Multiplier Keypad Scanner Binary Dividers 5. SM Charts and Microprogramming State Machine Charts Derivation of SM Charts realization of SM Charts Implementation of the Dice Game Microprogramming Linked State Machines 6. Designing with Field Programmable Gate Arrays Implementing Functions in FPGAs Implementing Functions Using Shannon's Decomposition Carry Chains in FPGAs Cascade Chains in FPGAs Examples of Logic Blocks in Commercial FPGAs Dedicated Memory in FPGAs Dedicated Multipliers in FPGAs Cost of Programmability FPGAs and One-Hot State Assignment FPGA Capacity: Maximum Gates Versus Usable Gates Design Translation (Synthesis) Mapping, Placement, and Routing 7. Floating-Point Arithmetic Representation of Floating-Point Numbers Floating- Point Multiplication Floating-Point Addition Other Floating- Point Operations 8. Additional Topics in VHDL VHDL Functions VHDL Procedures Attributes Creating Overloaded Operators Multi-Valued Logic and Signal Resolution The IEEE 9-Valued Logic System SRAM Model Using IEEE 1164 Model for SRAM Read/Write System Generics Named Association Generate Statements Files and TEXTIO 9. Design of a Risc Microprocessor The RISC Philosophy The MIPS ISA MIPS Instruction Encoding Implementation of a MIPS Subset VHDL Model 10. Hardware Testing and Design for Testability Testing Combinational Logic Testing Sequential Logic Scan Testing Boundry Scan Built-In Self- Test 11. Additional Design Examples Design of a Wristwatch Memory Timing Models A Universal Asynchronous Receiver Transmitter (UART) Appendix Appendix A : VHDL Language Summary Appendix B : IEEE Standard Libraries Appendix C : TEXTIO Package Appendix D : Projects References