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For a hypothetical system, assume the following, it costs 1 cycle to perform a store instruction to a device register, and it costs 5 cycles

For a hypothetical system, assume the following, it costs 1 cycle to perform a store instruction to a device register, and it costs 5 cycles to configure a DMA controller. Also, the PCI-bus is 8 bytes wide. And assume that all devices in the system support both DMA and programmed IO based operations.

Which device access method is best for the following devices? Explain why.

a. Keyboards

b. Network interface controllers

The options to consider are programmed IO, DMA, or depends

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