A generic DMA controller consists of the following components: • Address generator • Address bus interface • Data bus interface • Bus requestor • Interrupt signal circuits • Local peripheral controller. The local peripheral controller is the circuitry that the DMA uses to select among the peripherals connected to it. This circuit is activated right after the bus is requested. What is
A generic DMA controller consists of the following components:
• Address generator
• Address bus interface
• Data bus interface
• Bus requestor
• Interrupt signal circuits
• Local peripheral controller.
The local peripheral controller is the circuitry that the DMA uses to select among the
peripherals connected to it. This circuit is activated right after the bus is requested. What is
the purpose of each of the other components listed above and when are they active?
7. Of programmed I/O, interrupt-driven I/O, DMA, or channel I/O, which is not suitable for
processing the I/O of a:
a. Mouse
b. Game controller
c. CD
d. Thumb drive or memory stick
Explain your answers.
8. If an address bus needs to be able to address eight devices, how many conductors will be
required? What if each of those devices also needs to be able to talk back to the I/O control
device?
9. Define the terms seek time, rotational delay, and transfer time. Explain their relationship.
10. Why do differing systems place disk directories in different track locations on the disk?
What are the advantages of using each location that you cited?
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