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Interrupts

Overview. I/O ParadigmSynchronizationPolling Control and Status RegistersInterrupt Driven I/OImportance of Interrupts. I/O Paradigm. All I/O devices connect to a busProcessor Accesses I/O through fetch/storeAll I/O devices are assigned a bus address. Synchronization. Problems:Devices cannot

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Interrupts

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    1. Interrupts By Ryan Morris

    2. Overview I/O Paradigm Synchronization Polling Control and Status Registers Interrupt Driven I/O Importance of Interrupts

    3. I/O Paradigm All I/O devices connect to a bus Processor Accesses I/O through fetch/store All I/O devices are assigned a bus address

    4. Synchronization Problems: Devices cannot remember a list of commands, circuits execute commands as they are given Processors are much faster than I/O devices, therefor the CPU must wait for one instruction to be executed before issuing the following command

    5. Polling Most common way for older software to instruct the processor handle I/O devices. CD/DVD, Keyboard, Mouse, Printer, etc. In essence the processor repeatedly asks devices if they are ready for the next instruction.

    6. How to use polling Polling uses Fetch portion of fetch-store paradigm Because I/O uses a bus for access, pointers can be used to reference the memory area for a specific I/O device.

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