Question

Cycle stealing mode of DMA operation involves:

• A. DMA controller taking over the address, data, and control buses while a block of data is transferred between memory and I/O device.
• B. While the microprocessor is executing a program, an interface circuit takes over control of address, data, and control buses when not in use by the microprocessor.
• C. Data transfer takes place between the I/O device and memory during every alternate clock cycle.
• D. The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses.

Hint:

Cycle stealing allows efficient data transfer by sharing the bus without fully halting CPU operations.

Answer 1

The Correct Option is C

Cycle stealing allows the DMA controller to momentarily halt the CPU on alternate clock cycles. This grants the DMA access to the system bus for data transfer between I/O devices and memory, ensuring bus sharing and minimizing performance impact.