1. Class Exercise 1B

2. Rules
If you believe that you know a correct answer, please raise your hand
I will select one or more students
(independently whether an answer given by
the first student is correct or incorrect)
Please, identify yourself by first name
and give an answer
Correct answer = bonus point 8

3. Problem 1
What is a difference between
combinational logic and sequential logic?

4. Problem 2
What is a difference between Latches
and Flip-flops?

5. Problem 3
What is a difference between:
Reset active high vs. Reset active low
Asynchronous Reset vs. synchronous Reset?

6. Problem 4
What is a register?

7. Problem 5
Draw a block diagram of the digital circuit
with the following interface and functionality:
Interface:
Din – 8-bit data input
Dout – 8-bit data output
Addr – 2-bit address of the location (register)
where input data is stored or output
data is read from
RW – control signal, 0=read, 1=write
Clk – clock

8. Problem 5 (cont.)
Functionality:
If RW = 1, then the output Dout is set to
the high impedance state, and at the next rising
edge of the clock, data from the input Din is
stored in the internal location given by the
address Addr.
If RW = 0, data from the location
given by the address Addr is transferred to
the output Dout, and the contents of the internal
memory (registers) does not change.

9. Problem 5 (cont.)
Assume that the internal memory is
implemented using registers.
Use only medium scale components,
such as registers, multiplexers, encoders,
decoders, buffers, etc.

10. Problem 6
Draw internal structure of a
4-bit Shift Register with Enable
and Parallel Load

11. Problem 7
What is a difference in terms of the required
inputs and outputs between ROM and RAM
of the same size (e.g. 2m x n)?

12. Problem 8
What is a difference between a single-port
and dual-port RAM?
What operations are allowed in
the dual-port RAM?