Quiz submission record for quiz6-2-2 at Thu Jul 29 01:44:29 2004:

Your Answer for Question 1:
The EPC contains the address of the instruction that causes the exception.  The Cause register contains a code for the type of exception.

Your Answer for Question 2:
Some processors do not attempt to find the instruction that caused the exception and simply put the address of the last instruction in the pipe.  These are "imprecise" exceptions because the exact offending instruction is unknown.

Your Answer for Question 3:
Because the processor is faster than most imput devices, the process of polling slows down program exicution because it has to check the status regester very often.

Your Answer for Question 4:
Memory-mapped io means that the input device puts it's data into a space that the processor can access like memory.

loop:
lw $t0 0(0xffff0000)
sll $t0 $t0 31
srl $t0 $t0 31
bne $t0 $0 loop
lw $t1 0(0xffff0004)
sll $t1 $t1 24
srl $t1 $t1 24
add $v0 $t1 $0


Your unique submission ID is quiz6-2-2-cs61c-au-1091090669-896.