… determines action to take based on registers

Device controller determines action to take based on …

…. transfers data between device and its local buffer

… generates an interrupt to inform the ….

… returns control to the operating system

Device Driver possibly returning the data if the operation was a …

For other operations, the device driver returns

This is fine for moving small amounts of data but can produce high overhead on the CPU when used for bulk data movement

With Direct Memory Access Device controller transfers an entire block of data between

Device controller generates only one interrupt per …., to inform the device driver, rather than one interrupt per

With Direct Memory Access While the device controller is transferring a whole data block, the CPU is available to accomplish other work

…….. processor supports a complete instruction set

……. processor supports a limited instruction set

….. can execute user processes

…. cannot execute user processes

…… processors include device-specific processors, such as disk, keyboard, and graphics controllers

A single processor system has … general-purpose processor.

Also known as parallel systems

Also known as tightly-coupled systems

Multiprocessor Systems are known as

In single processor systems Two or more general-purpose processors in close communication, sharing bus, clock, memory, and peripheral devices