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VHDL Fundamentals: LIBRARY, ENTITY, and ARCHITECTURE

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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?

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

What is the purpose of the ieee library in VHDL?

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

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

ieee, std, and work Signup and view all the answers

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

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

What is the purpose of the work library in VHDL?

To save the design files, including the.vhd file Signup and view all the answers

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

Part II (chapters 10–12) Signup and view all the answers

What is the purpose of the std library in VHDL?

To provide a resource library for the VHDL design environment Signup and view all the answers

What is the difference between the std_logic_1164 and std_logic_arith packages?

std_logic_1164 specifies STD_LOGIC, while std_logic_arith specifies SIGNED and UNSIGNED Signup and view all the answers

What is the purpose of the ENTITY in VHDL?

To specify the input and output pins of the circuit Signup and view all the answers