Data Transfer Schemes in Microprocessors

What is the primary purpose of data transfer schemes in microprocessors?

• To increase processing speed

• To manage memory usage

• To move data between different parts of a system

• To enhance input/output operations

Which data transfer scheme involves the CPU directly controlling the data transfer between I/O devices and memory?

• Programmed I/O (PIO)

• Direct Memory Access (DMA)

• Interrupt-driven I/O

• Memory-mapped I/O

In which data transfer method does the CPU become involved in every data transfer, potentially leading to inefficiency?

• Direct Memory Access (DMA)

• Interrupt-driven I/O

• Programmed I/O (PIO)

• Block transfer

Which data transfer scheme allows peripherals to transfer data directly to or from memory without CPU intervention?

• Programmed I/O (PIO)

• Direct Memory Access (DMA)

• Interrupt-driven I/O

• Memory-mapped I/O

How does an interrupt-driven I/O scheme benefit a microprocessor system?

• By increasing the CPU's direct control over data

• By allowing the CPU to perform other tasks while waiting for I/O operations

• By avoiding any form of I/O operations

• By performing all data transfers without CPU involvement

Which data transfer scheme uses special control lines to facilitate communication between memory and I/O devices?

• Memory-mapped I/O

• Programmed I/O (PIO)

• Direct Memory Access (DMA)

• Bus-oriented I/O

What is the role of the DMA controller in a Direct Memory Access (DMA) scheme?

• To handle all I/O operations directly

• To manage data transfer between memory and I/O devices independently of the CPU

• To increase the CPU's involvement in data transfer

• To convert data into a different format

In a memory-mapped I/O system, how is I/O communication handled?

• Through separate I/O ports

• Using memory addresses to access I/O devices

• Via direct CPU commands

• Through external controllers only

Which of the following is NOT a common feature of Direct Memory Access (DMA)?

• It allows for block data transfer

• It frees the CPU from being involved in every data transfer

• It requires manual intervention for each data transfer

• It can improve data transfer efficiency

What happens in a data transfer scheme when an interrupt occurs?

• The CPU immediately halts all operations

• The CPU performs a context switch to handle the interrupt service routine

• The data transfer scheme stops working entirely

• The CPU performs a direct data transfer without interruption