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Statements

Subject Item
dbr:ARM_architecture_family
dbo:wikiPageWikiLink
dbr:Fast_interrupt_request
Subject Item
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rdfs:label
Fast interrupt request
rdfs:comment
Fast interrupt request (FIQ) is a specialized type of interrupt request, which is a standard technique used in computer CPUs to deal with events that need to be processed as they occur, such as receiving data from a network card, or keyboard or mouse actions. FIQs are specific to the ARM architecture, which supports two types of interrupts; FIQs for fast, low-latency interrupt handling, and standard interrupt requests (IRQs), for more general interrupts.
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Fast interrupt request (FIQ) is a specialized type of interrupt request, which is a standard technique used in computer CPUs to deal with events that need to be processed as they occur, such as receiving data from a network card, or keyboard or mouse actions. FIQs are specific to the ARM architecture, which supports two types of interrupts; FIQs for fast, low-latency interrupt handling, and standard interrupt requests (IRQs), for more general interrupts. An FIQ takes priority over an IRQ in an ARM system. Also, only one FIQ source at a time is supported. This helps reduce interrupt latency as the interrupt service routine can be executed directly without determining the source of the interrupt. A context save is not required for servicing an FIQ since it has its own set of banked registers. This reduces the overhead of context switching.
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