Given the following set of events, show which routines the CPU is executing for

Question

Given the following set of events, show which routines the CPU is executing for times 0 to 100 ns. Each handler routine (with its interrupt request) takes 20 ns to complete. The priority of the interrupts ranges from IRQ6 as the highest priority interrupt to IRQ0 as the lowest priority interrupt.

Time

Action

0 ns

Start of main program

10 ns

IRQ1

25 ns

IRQ4

40 ns

IRQ6

50 ns

IRQ3

            Time                Action

            0 ns:                 Start of Main Program

10s:                IRQ1

Time

Action

0 ns

Start of main program

10 ns

IRQ1

25 ns

IRQ4

40 ns

IRQ6

50 ns

IRQ3

Explanation / Answer

R U LOOKING FOR THIS:

As an interrupt will complete one instruction in 20ns this means after 20ns another interrupt will be handled no matter the previous one is completed or not

0 - 10ns IRQ1
10 - 30ns IRQ4
30 - 65ns IRQ6
50 - 100ns IRQ3

And in parallel to IRQ6, from 50ns, IRQ3 will start

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