Quiz submission record for quiz6-2-2 at Thu Jul 29 10:33:19 2004:

Your Answer for Question 1:
EPC is a 32 bit register used to hold the address of the affected instruction. Cause is a register used to record the cause of the exception. the R-format MIPS instructions access EPC and Cause.

Your Answer for Question 2:
The difficulty of always associating the correct exception with the correct instruction in pipelined computers has led some computer designers to relax this requirement in noncritical cases. Such machines are said to have imprecise interrupts or imprecise exceptions.

Your Answer for Question 3:
Polling is the simplest way for an I/O device to communicate with the processor. The I/O device simply puts the information in a status register, and the processor must come and get the information. The processor is totally in control and does all the work.

Your Answer for Question 4:
"Memory-mapped" means that each register appears as a special memory location.


Your unique submission ID is quiz6-2-2-cs61c-em-1091122399-563.