Week 8

Question 1

Combinational Logic has

and the

Answer 1

• No memory of past inputs or outputs.

- Output is purely a function of logic inputs at the present time.

Question 2

Characteristics of sequential logic:

Answer 2

• Feedback path(s) between output and input or between later and earlier logic levels
• Logic level at the output depends on present logic inputs and previous logic output (present state)
• Has potential for memory

Question 3

When S-R latch is in SET state (Q is HIGH):

Answer 3

it will remain in this state until R goes high.

Question 4

When S-R latch is in RESET state (Q is LOW):

Answer 4

it will remain in this state until S goes high.

Question 5

If the S-R latch is GATED:

Answer 5

• When EN = 1, the latch behaves as before.

- When EN = 0, Q(t+1) = Q(t) for all values of S and R

Question 6

Invalid state of an S-R latch is

Answer 6

S = R = 1