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Questions and Answers
What does VHDL stand for?
What does VHDL stand for?
When did VHDL become the industry standard language for describing digital circuits?
When did VHDL become the industry standard language for describing digital circuits?
What is the purpose of VHDL?
What is the purpose of VHDL?
How is documentation included in VHDL code?
How is documentation included in VHDL code?
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What does the entity declaration in VHDL code define?
What does the entity declaration in VHDL code define?
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Which of the following words can be used as a legal signal name in VHDL?
Which of the following words can be used as a legal signal name in VHDL?
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What does the 'inout' mode indicate for a signal in VHDL?
What does the 'inout' mode indicate for a signal in VHDL?
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Which of the following is a built-in signal type in VHDL?
Which of the following is a built-in signal type in VHDL?
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What does the 'bit_vector' type define in VHDL?
What does the 'bit_vector' type define in VHDL?
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What values can a 'std_logic' type have in VHDL?
What values can a 'std_logic' type have in VHDL?
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Study Notes
VHDL Overview
- VHDL stands for Very High-Speed Integrated Circuit Hardware Description Language.
- VHDL became the industry standard language for describing digital circuits in the 1980s.
Purpose of VHDL
- The primary purpose of VHDL is to model and simulate digital electronic systems.
- VHDL allows for specification of both the behavior and structure of digital circuits.
Documentation in VHDL
- Documentation can be included in VHDL code through comments.
- Comments are denoted by
--for single-line and/* ... */for multi-line comments.
Entity Declaration in VHDL
- The entity declaration defines the interface of a VHDL model, including its inputs, outputs, and other parameters.
- It serves as the blueprint that describes how the VHDL design interacts with other components.
Legal Signal Names in VHDL
- Legal signal names in VHDL can include a combination of letters, digits, and underscores.
- However, names cannot start with a digit, and reserved keywords cannot be used.
'inout' Mode in VHDL
- The 'inout' mode indicates that a signal can both receive and send data.
- This mode is used for bidirectional signals, allowing for versatile connections.
Built-in Signal Types in VHDL
- Common built-in signal types in VHDL include
bit,std_logic,std_logic_vector, andinteger. - These types provide a framework for defining the nature of signals within a circuit.
'bit_vector' Type in VHDL
- The 'bit_vector' type is an array of
bitvalues. - It is used to represent multiple bits in a single signal, facilitating complex data structures.
Values of 'std_logic' Type
- The 'std_logic' type can have several values: '0', '1', 'Z' (high impedance), 'X' (unknown), and '-' (don't care).
- This flexibility allows designers to model various states in digital logic more accurately.
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Description
Test your understanding of VHDL, the industry standard language for describing digital circuits. This quiz covers the basics of VHDL, its purpose, documentation, and simulation.
