Programmed input–output: Difference between revisions

Revision as of 02:49, 15 December 2016

Revision as of 22:03, 16 December 2016

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'''Programmed input/output''' ('''PIO''') is a method of transferring data between the [[Central processing unit|CPU]] and a peripheral, such as a network adapter or an [[AT Attachment|ATA]] storage device.

For programmed I/O, the software that is running on the CPU uses instructions that access I/O address space to perform data transfers to or from an I/O device ([[Memory-Mapped I/O]]) .<ref>Computer Organization and Architecture 9th Edition. Stallings, William. Pearson, 2012</ref>.

This is in contrast to [[Direct Memory Access]] (DMA) transfers.