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 (D)</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 (D)</p> Signup and view all the answers

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

<p>ieee, std, and work (D)</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 (D)</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 (A)</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) (C)</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 (C)</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 (B)</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 (B)</p> Signup and view all the answers

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