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Introduction to VHDL Coding

This document provides a comprehensive introduction to VHDL coding, focusing on its implementation using the Xilinx ISE Design Suite. It outlines essential knowledge of VHDL including entity declarations, port definitions, and architecture bodies. A step-by-step example features the implementation of a Full Adder, from project setup and configuration to generating VHDL templates. The work flow from schematic design to VHDL code and bit file download for BASYS boards is also discussed, including the usage of logical operators and signal assignment for effective coding practices.

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Introduction to VHDL Coding

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  1. Introduction to VHDL Coding Wenchao Cao, Teaching Assistant Department of EECS University of Tennessee

  2. Outline Example of VHDL Coding in Xilinx ISE Design Suite Basic Knowledge of VHDL

  3. Outline Example of VHDL Coding in Xilinx ISE Design Suite Basic Knowledge of VHDL

  4. Example of VHDL Coding in Xilinx ISE Design Suite Work Flow The figure shows the software tools in a logic design project from schematic to VHDL code to *.bit file for download to BASYS or BASYS2 board.

  5. Implementation of a Full Adder

  6. Create A New Project

  7. Project Settings Choose TQ144 if you are using a BASYS board

  8. Create New Sauce Files

  9. Generated VHDL file template by the software: • Entity declaration • (Entity name) • Port definition • (Port name and direction) • Architecture body • (Write the functions here!)

  10. Outline Example of VHDL Coding in Xilinx ISE Design Suite Basic Knowledge of VHDL

  11. Basic Modeling Constructs • Entity declarations • Entity identifier: Lab00 • Ports definition • Port names: A, B, Cin, S, Cout • Port directions • “in” for input ports, “out” for output ports. • Architecture body • Architecture identifier: Behavioral • Behavioral descriptions • Signal assignment statement • S <= A xor B xorCin; • Logical operators • and, or, not, xor, nand, nor, xnor • (No difference between upper case and lower case.) • Use ( ) to make the statement clearly expressed.

  12. Signal Assignment Statement • Example • Logical operators in lower case • Logical operators in upper case • Less parentheses ( )

  13. Assign Logic ‘1’ and Logic ‘0’ • Example • Assign value of ‘1’ • Assign value of ‘0’

  14. Introduction to VHDL Coding QUESTIONS ?

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