Week 11

Question 1

CAM memory includes

Answer 1

latch to store one bit and a dedicated bit comparison circuit

Question 2

CAM is organized as

Answer 2

N m-bit slots, where N and m chosen by need and cost

Question 3

Most page table entries are _____

Answer 3

not resident

Question 4

how do you handle a page fault for non-resident bits?

Answer 4

1) CPUT read or write at address in a non-resident page
2) MMU performs translations, finds resident bit is not set, then sends page fault signal
3) OS changes CPU mode to OS privalege level, saves information needed to restart process after fault, and calls page fault holder

Question 5

what are the 2 types of errors on a bus?

Answer 5

Address conflict, unassigned address

Question 6

Error when two busses attempt to respond to a given address

Answer 6

address conflict

Question 7

Error when no device responds to a given address

Answer 7

Unassigned address

Question 8

what is a better alternative to a bus that can connect multiple devices

Answer 8

switching fabric:
sender supplies data and destination device, while fabric delivers data to specified destination

Question 9

Polling:

Answer 9

Waiting for certain tasks to be over before you can move on to the next one, processor “asks” if a given task is done yet

Question 10

A better option to polling:

Answer 10

Interupt-driven: instead of having a loop that you wait in, just have device interupt processor when the task is complete

Question 11

True / false: processor boots with interupts disabled

Answer 11

true