Electronics applications and bases
Sequential electronics and sequential systems
Logical sequential fonctions and components
4+ First type level variation (H) from up to down:
Logical sequential fonctions and components
1+In
the automatic sequential systems, and control systems, the
outputs parameters
depend on the input states and levels with their
timing progress (variations).
The Flipflops
2+The flipflops are used in sequential
systems and digital time
systems , real time analysis and systems, they are in
more and
more complex nowadays.
+The methods of synthesis and analysis
used in studying
electronics and microelectronics applications; we will study
the
different types of flip-flops constructing the digital circuits and
the
real time systems.
+++RS Flipflop
with varing timing analysis
3+The RS Flipflop is the base of all the
other flipflops.
The output of RS
flipflop is put ‘1’ or ‘On’ when the set is
active and put ‘0’ or ‘off’ when
the input of the reset is active.
+The combination between set = 1 and reset
= 1 is interdict
(prohipted) , but we have to define two types of RS flipflops:
...Priority at 0
Fig-1
Priority at 1
Fig-2
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
RS FlipFlops continous and depending on
timing
Fig-3
5+ Second
Type edge variation (H) on the positive or the negative edge:
Fig-4
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
6+++ D-Flipflop
+The
output Q is equal to S if the clock H=1, the output Q is registered in the
memory if H=0.
+This
type of Flipflop is used in setting on
or off a circuit or automatic system by using the front edge control in timing
processing, and also used in memorization of a signal for certain time (clock)
of the input signal.
Fig-5
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++7+++Multiplexer
+A multiplexer is an electronic system and
a control switching component it’s input are 2n , n are the number of bits by selectors.
In our Example
Q is connected to I0 if S1=0 and S0=0,
Q is connected to I1 if S1=0 and S0=1,
Q is connected to I2 if S1=1 and S0=0, and
Q is connected to I3 if S1=1 and S0=1.
Fig-6
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
8+ The Counters
The counters are sequential systems of n-flipflops.
the dynamic systems(used in counting, with counting stages) in
automatic systems, microelectronic systems are fixed by the
nombers of flipflops used in each circuit or in each integrated
circuit.
Asynchronus Counters:
Fig-7
Synchronus counters:
Fig-8
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Fonctional electronics circuits and VHDL discription.
9 +++ This is the VHDL discription for the syenthisis electronic circuit used here :
Fig-9
Y <= (A and C) or (B and not C) or (not A and B and C) ;
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
10 +++ This is the VHDL discription for the syenthisis electronic circuit used here :
Fig-10
Z <= (A and C) or (B and not C) or
(not A and B and C) ;
X
<= (D and F) or (E and not F) or (not D and E and F) ;
Y
<= Z or X
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Thank you hope you used this courses in good applications,
and hope you work more and more honestly.
thank you for using electronics in peace and in the light.
this pages Wrote and developped by Mikel.
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