Quiz submission record for quiz6-2-2 at Thu Jul 29 10:45:15 2004:

Your Answer for Question 1:
EPC holds the address of the affected instruction.

Cause records what caused the exception.

It is implemented with subtract

Your Answer for Question 2:
Pipelining means there's several operations going on at once so it's difficult to narrow down to which operation caused the exception to occur. Thus, some hardware return imprecise addressing of where the exception occurred and leave it up to the OS to be more accurate.

Your Answer for Question 3:
Polling wastes processor time because the processor is much faster than IO devices so many times in a non interrupt driven system it will poll IO devices many times even thought no changes have occured.

Your Answer for Question 4:
memory mapped io means each register appears as a special memory location.

loop:   lb $v0, 0($RC)
        addiu $RC, 4
        j loop

$RC- Receiver control


Your unique submission ID is quiz6-2-2-cs61c-be-1091123115-1785.