Quiz submission record for quiz6-2-2 at Thu Jul 29 10:04:59 2004:

Your Answer for Question 1:
The EPC register stores the address where the exception occured and the cuase register stores the cause of the exception.  EPCWrite and CauseWrite access these registers

Your Answer for Question 2:
Expections with imprecise information about the exception, used in none critical cases to make the processor faster and simpler.  The CPU may put an incorrect address in the EPC and rely on the OS to figure out the real exception.

Your Answer for Question 3:
Large overhead.  Most devices are much slower than the processor, so the processor may waste many clock cycles checking to see if the device has finished its slow operation.

Your Answer for Question 4:
memory mapped io means that data written to a certain portion of memory is actually not written but instead forwarded to a specific device

  lw $t1 address
loop:
  lb $v0 7($t1)
  j loop



Your unique submission ID is quiz6-2-2-cs61c-bg-1091120699-2527.