VHDL Fundamentals: LIBRARY, ENTITY, and ARCHITECTURE
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Questions and Answers

What is the purpose of a LIBRARY in VHDL?

  • To contain the VHDL code that describes the circuit's behavior
  • To specify the architecture of the circuit
  • To collect and reuse commonly used pieces of code (correct)
  • To define the I/O pins of the circuit
  • What are the three fundamental sections of a standalone VHDL code?

  • LIBRARY, ENTITY, and FUNCTION
  • LIBRARY declarations, ENTITY, and ARCHITECTURE (correct)
  • PACKAGE, ENTITY, and ARCHITECTURE
  • LIBRARY declarations, ENTITY, and PACKAGE
  • How many lines of code are needed to declare a LIBRARY?

  • Two (correct)
  • One
  • Three
  • Four
  • What is the purpose of the ENTITY section in VHDL?

    <p>To specify the I/O pins of the circuit</p> Signup and view all the answers

    What is the purpose of the ieee library in VHDL?

    <p>To specify a multi-level logic system, including STD_LOGIC and STD_ULOGIC</p> Signup and view all the answers

    What are the three libraries usually needed in a VHDL design?

    <p>ieee, std, and work</p> Signup and view all the answers

    What is the difference between IN and OUT modes in an ENTITY?

    <p>IN is used for input signals, while OUT is used for output signals</p> Signup and view all the answers

    What is the purpose of the work library in VHDL?

    <p>To save the design files, including the.vhd file</p> Signup and view all the answers

    What part of the book covers the library-related sections of VHDL?

    <p>Part II (chapters 10–12)</p> Signup and view all the answers

    What is the purpose of the std library in VHDL?

    <p>To provide a resource library for the VHDL design environment</p> Signup and view all the answers

    What is the difference between the std_logic_1164 and std_logic_arith packages?

    <p>std_logic_1164 specifies STD_LOGIC, while std_logic_arith specifies SIGNED and UNSIGNED</p> Signup and view all the answers

    What is the purpose of the ENTITY in VHDL?

    <p>To specify the input and output pins of the circuit</p> Signup and view all the answers

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