Skip to main content

Important Digital Logic and Design Short Questions

Chapter: 21
Question 1:
What is the Simple Mode in GAL16V8?
Answer: In Simple Mode, the OLMC is configured as a dedicated combinational output or input, with the active state controlled by an XOR gate.
Chapter: 21
Question 2:
What is the function of the XOR gate in Simple Mode?
Answer: The XOR gate determines whether the output is active-high or active-low in the combinational output mode.
Chapter: 21
Question 3:
How does the Complex Mode differ from Simple Mode?
Answer: Complex Mode allows the tri-state buffer to be controlled by a logical expression, enabling more advanced logic functions.
Chapter: 21
Question 4:
What is ABEL and its primary use?
Answer: ABEL (Advanced Boolean Expression Language) is a hardware description language used to program PLDs, supporting Boolean equations, truth tables, and state diagrams.
Chapter: 21
Question 5:
What are the ABEL symbols for NOT, AND, OR, and XOR operations?
Answer: In ABEL, NOT is represented by '!', AND by '&', OR by '#', and XOR by '$'.
Chapter: 21
Question 6:
How are Boolean equations represented in ABEL?
Answer: Boolean equations in ABEL use specific symbols like '&', '#', and '$' to represent logical operations, and variables must end with a semicolon ';'.
Chapter: 21
Question 7:
What is the purpose of the truth table in ABEL?
Answer: Truth tables in ABEL are used to describe the behavior of logic circuits, providing a clear and structured way to define inputs and corresponding outputs.
Chapter: 21
Question 8:
How is a 4-input 4-bit MUX represented in ABEL?
Answer: A 4-input 4-bit MUX in ABEL is represented by Boolean expressions that define how the output Y is determined based on select inputs S1 and S0.
Chapter: 21
Question 9:
What is a test vector in ABEL?
Answer: A test vector in ABEL specifies inputs and their corresponding outputs, allowing the verification of the logic circuit's operation.
Chapter: 22
Question 10:
What does a Quad 1-of-4 MUX consist of?
Answer: A Quad 1-of-4 MUX consists of four multiplexers, each with four inputs and one output. All multiplexers share two select inputs.