Week 5

Question 1

What can and can’t a SR Latch do?

Answer 1

Do:
– Maintain state
– Reset state
– Set state

Can’t:
– It allows set and reset at same time – PROBLEM

Question 2

What can and can’t an Unclocked D Latch do?

Answer 2

Do:
– It has only one input, so set and reset cannot occur at the same time.
– Set and reset memory.

Can’t:
– Cannot maintain state – not memory!

Question 3

What can and can’t a Clocked D Latch do?

Answer 3

Do:
– When clock set to 0, state is maintained.
– When clock set to 1 and input set to 0 (reset), outcome will be 0.
– When clock set to 1 and input set to 1 (set), outcome will be 1.

Can’t:
– Nothing – it functions as memory!
– However, to works as a multi-bit word, it needs synchronization.