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Important Digital Logic and Design Short Questions

Chapter: 42
Question 1:
What is the arrangement of a FLASH memory array?
Answer: FLASH memory arrays are arranged in rows and columns, with each row connected to the Control Gate of MOS transistors. Each row typically represents a single byte, with multiple cells activated by a single row. The Source terminals of transistors in each column are connected together.
Chapter: 42
Question 2:
How is a single row selected in a FLASH memory array?
Answer: A single row is selected by activating the corresponding row select line. This action activates all transistors in that row, allowing current to flow through selected transistors based on the column select line and whether the transistor gate has a stored charge.
Chapter: 42
Question 3:
What determines the flow of current through a column in FLASH memory?
Answer: Current flows through a column if the transistor gate has no stored charge and the corresponding column select line is activated. If the transistor gate has a stored charge, no current flows through the column.
Chapter: 42
Question 4:
How does the comparator in FLASH memory function?
Answer: The comparator compares the voltage drop across an active load with a reference voltage. If current flows through the column (indicating no charge on the gate), the comparator output is 0. If no current flows (indicating a charge on the gate), the output is 1.
Chapter: 42
Question 5:
What are the characteristics of SRAM?
Answer: SRAM is non-volatile, not high density (as it requires six transistors per bit), and does not allow in-system writing.
Chapter: 42
Question 6:
How does DRAM differ from SRAM?
Answer: DRAM is non-volatile and offers high density as it uses only one transistor and a capacitor per bit, unlike SRAM. It also allows in-system writing.
Chapter: 42
Question 7:
What is the main feature of EEPROM compared to ROM?
Answer: EEPROM allows data to be read and written, including changes without removing the chip, unlike ROM, which only retains information permanently and does not support in-system writing.
Chapter: 42
Question 8:
What is FIFO memory and its primary use?
Answer: FIFO (First In-First Out) memory is used to manage data transfer between devices operating at different data rates. Data is read out in the same order it was written.
Chapter: 42
Question 9:
How does FIFO memory handle data from devices with different data rates?
Answer: FIFO memory temporarily stores data from a faster device and releases it to a slower device in the same sequence, preventing the faster device from being delayed by the slower one.
Chapter: 42
Question 10:
Describe the function of shift registers in FIFO memory implementation.
Answer: Shift registers in FIFO memory manage the sequence of data input and output, shifting data forward as it is read out, and allowing new data to be written in at the end of the buffer.