Quiz submission record for quiz6-1-1 at Mon Jul 26 00:20:04 2004:

Your Answer for Question 1:
We would encounter difficulties when encountering lw because we would have no way of stalling the processor.  We would also have to include muxes and forward in every possible situation rather than just forwarded from the pipeline registers.

Your Answer for Question 2:
The control signals come from the hazard detection in the control unit.
00 add $t0, $t1, $t2
   add $t3, $t4, $t5

01 add $t0, $t1, $t2
   add $t3, $t0, $t4

10 lw $t4 0($t5)
   add add $t0, $t1, $t2
   add $t3, $t0, $t4

Your Answer for Question 3:
THe hazard unit controls the PC and instruction fetch so when it detects the necessary conditions for a bubble, deasserting the control signals and essentially have each previous stage of the pipeline repeat what it did in the previous stage so that the lw may progress.  The condition for the hazard would no longer be true since the lw would have advanced one stage.


Your unique submission ID is quiz6-1-1-cs61c-an-1090826404-860.