This book teaches readers how to design and simulate digital systems using the hardware description language, VHDL. Focus is placed on writing VHDL design decriptions, VHDL testbenches, and the steps in VHDL/PLD (programmable logic devices) design methodology. KEY TOPICS: Topics include: Digital Design using VHDL and PLDs; Entities, Architectures, and Coding Styles; Signals and Data Types; Dataflow and Behavioral Style Combinational Design; Event-Driven Simulation; Testbenches for Combinational Designs; Latches and Flip-Flops; Mulitbit Latches, Registers, Counters, and Memory; Finite State Machines; ASM Charts and RTL Design; Subprograms; Packages; Testbenches for Sequential Systems; Modular Design and Hierarchy. More than 275 block diagrams, logic diagrams, and timing waveforms and 180+ program listings illustrate the design concepts. The book includes the Aldec Active-HDL(TM) 7.2 Student Edition Software. MARKET: This book is suitable for anyone with a basic understanding of logic design and a minimal background in programming who desires to lean how to design digital systems using VHDL. No prior experience with VHDL is required.