Handling Multiple Devices

Interrupt Priority

•   Continue to accept interrupt requests from higher priority components
•   Disable interrupts from component at the same level priority or lower
•   At the time of execution of interrupt-service routine
•   Privileged instructions executed in the supervisor mode

Controlling device requests

•   Interrupt-enable

KEN, DEN

Implementation of interrupt priory by using individual interrupt-request and acknowledge lines

Polled interrupts: Priority decided by the order in which processor polls the component (polls their status registers) vectored interrupts: Priority determined by the order in which processor tells component toput its code on the address lines (order of connection in the chain)

(a)   Daisy chain

Daisy chaining of INTA: If device has not requested any service, passes the INTA signal to next device if necessitate service, does not pass the INTA, puts its code on the address lines Polled

 

Posted Date: 10/13/2012 7:21:47 AM | Location : United States

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