Digital Logic Design

1. COUNTERS AND
REGISTERS

2. Register
Flip flop is 1 bit memory cell.
To increase the storage capacity we have to
use group of flip flops. This group of ff is
known as Register.
The n bit register consist of n number of ff
and is capable of storing n bit word.

4. O We are bound to follow the clock.
O To get rid of dependency of clock we use.
O Load.
O Load are of two types.
O Asynchronous and Synchronous.

5. Data can be entered in serial or in parallel form.

6. Classification of Register
Depending on i/p and o/p.
O Serial In Serial Out shift register
O Serial In parallel Out shift register
O Parallel In Serial Out shift register
O Parallel In parallel Out shift register

7. Depending on Application
O Shift Register
O Storage Register (pipo)

8. What is counter?
O Counter is a sequential circuit. A digital
circuit which is used for a counting pulses
is known counter.
O Counters can be designed by need for
example we can make counters which can
count 0 to 10 or 10,0.

10. O Where you can see output of 1st flip flip is
given as input to 2nd.
O Clock is control input
There are Two Types of Counters.
1. Asynchronous
2. Synchronous

11. Asynchronous counter/Ripple

12. Synchronous Counter

13. Difference
Asynchronous are slow.
Synchronous are fast.
Asynchronous are not clocked
simultaneously.
Asynchronous are clocked simultaneously.