1
|
Describe the
difference between combinational circuit and sequential circuit?
|
|
Combinational
circuit
- The
output at any time depends only upon present input at that time.
- The
previous input condition does not affect the output
- No
memory
Sequential
circuit
- The
output at any time depends only upon present input at that time as well as
past input.
- It
consists of memory.
- It
is made of combinational circuit and memory elements.
|
2
|
Explain the term : Flip
- flop
|
|
Flip
– flop
- It
has two stable states that can be used to store information.
- The
flip flops are made of logic gates.
|
3
|
Why the flip flop is
also called as Bi – stable Multi vibrator?
|
|
Bi
– stable Multi vibrator
- The flip flop is
called as Bi - stable multi vibrator because it has two stable states.
- The stable state can
be changed by applying the proper triggering signal at the input.
|
4
|
Which is the state
of flip flops?
|
|
State
of flip flop
- The state of the flip
flop always indicates the state of normal output.
- A flip flop is said
to be SET or HIGH or logic 1 state when the output is unity.
- A flip flop is said
to be RESET or LOW or logic 0 states when the output is zero.
|
5
|
Which are the
fundamental components of the shift registers and counters?
|
|
Flip
flops
|
6
|
Explain the term :
Latch
|
|
Latch
- It
is non – clocked flip flops. The output of the flip – flop latches 1 or 0
after applying input pulse.
|
7
|
Explain the term :
Gate Latch
|
|
Gate
Latch
- The
gate latch is a latch which responds to inputs when gate latch is on HIGH
state and does not respond when it is LOW state.
|
8
|
Explain the meaning
: Active Low input Latch and Active High input Latch
|
|
Active
Low input Latch
- It
means that SET and RESET are normally in the LOW state and one of them to be
pulsed to HIGH state when we want to change latch outputs.
Active
High input Latch
- It
means that SET and RESET are normally in the HIGH state and one of them to be
pulsed to LOW state when we want to change latch outputs.
|
9
|
Which is simplest
type of flip flop?
|
|
S
R flip flop
|
10
|
What is reason behind
the name SR flip flop?
|
|
There
are two inputs SET ( S ) and RESET ( R ) in the flip flop so it is called as
SR flip flop.
|
11
|
At which input
condition the output of the RS flip flop is unpredictable or invalid or not -
allowed?
|
|
NAND
gate RS Flip flop ( Active High)
- When
both inputs are High
NOR gate RS Flip flop
( Active LOW)
|
12
|
Which is other name
of SR flip flop?
|
|
Set
– Clear Flip flop
Set
– Reset Flip flop
|
13
|
Why resetting of the
flip flop is called as clearing?
|
|
The
resetting of the flip flop is called as clearing because the output 1 may be
clearing by reset it to 0.
|
14
|
Why the gated S – R
latch is called as asynchronous latch?
|
|
Gated
S – R latch
- The output of the gated S – R latch
changed at any time the input conditions are changed therefore it is called
as asynchronous latch.
|
15
|
Why the gated S – R
latch is called as clocked S – R latch?
|
|
Gated
S – R latch
- The gated S – R latch
has an ENABLE input.
- When the ENABLE input
high, its S and R input control the state of the flip flop.
- As the ENABLE input
low, the input becomes ineffective.
- The ENABLE input may
clock therefore it is called as clocked S – R latch.
|
No comments:
Post a comment