Select the correct alternative from the given choices. Which...

Select the correct alternative from the given choices. Which of the following DMA transfer modes an interrupt handling mechanisms will enable the highes $\mathrm{I} /$ O bandwidth? (A) Block transfer and polling interrupt (B) Cycle stealing and polling interrupt (C) Block transfer and vectored interrupt (D) Transparent DMA and vectored interrupt

Select the correct alternative from the given choices.
Which of the following DMA transfer modes an interrupt handling mechanisms will enable the highes $\mathrm{I} /$ O bandwidth?
(A) Block transfer and polling interrupt
(B) Cycle stealing and polling interrupt
(C) Block transfer and vectored interrupt
(D) Transparent DMA and vectored interrupt

Key Concepts

Direct Memory Access (DMA)

DMA is a process that offloads data transfer tasks from the CPU by allowing peripheral devices to transfer data directly to or from memory. This mechanism is crucial for high-speed I/O operations since it minimizes CPU intervention and maximizes data throughput by handling bulk data movements autonomously.

DMA Transfer Modes

DMA can operate in various transfer modes such as block transfer, cycle stealing, and transparent modes. Block transfer mode involves moving an entire block of data in one continuous operation, which reduces the overhead of repeatedly initiating transfers. In contrast, cycle stealing interleaves DMA transfers with the CPU’s processing cycles, potentially reducing overall bandwidth. Understanding these modes is essential when optimizing systems for maximum data transfer rates.

Interrupt Handling Mechanisms

Interrupt handling mechanisms determine how the system responds to transfer completion signals or peripheral requests. Vectored interrupts directly point to specific interrupt service routines, thereby reducing latency and overhead in processing interrupts. On the other hand, polling interrupts involve the CPU checking for an event occurrence, which can introduce delays. Efficient interrupt handling, such as through vectored interrupts, is important to maintain high I/O bandwidth by quickly servicing and resuming transfers.

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