As sequential circuits follow a series of events or states to generate the desired output, there should
be a mechanism to put the circuits into a known starting state.
In other words, to reset the circuits when they want to start performing their associated tasks.
Usually a recent signal in a sequential circuit has the responsibility of putting the circuit into a
known state, this lecture talks about this recent mechanise in the following slides.
I will define the that signal and how Attila's implements the.
A typical day, flipflop usually has a recip or clear signal to put that into a known estate in which
the output is usually zero, regardless of the logic value on the date.
But there is that signal can be active, high or active low.
In the active high case, the high logic value on the research signal clears a target flipflop.
As long as the signal is high, the flipflop output is zero.
Inactive low case, the low logic value on the reset signal clears the target flipflop.
As long as the recent signal is low, the flip flop out with the zero.
If there is a signal changes a state without considering the clock signal, then it is called asynchronous
results.
Alternatively, if it waits for the following edge off the clock to reset flipflops in the circuit,
it is called synchronous reset.
Let's consider the flip flop and its associated signals, if there is a signal is active, high and
asynchronous, then the cue output would be zero.
As soon as there is a signal goes high, when there is a signal is low, flipflop acts normally and
samples the input and the rising edge of the clock.
If there is that signal is active, high, but Synchronoss, then when it goes high, the volume rising
age of the clock clears the flipflop when there is that signal is low flipflop acts normally and samples
input data at the rising edge of the clock.
There are three configuration parameters invited, such a class that controls the recent behavior.
The first one determines which group of flipflops should have the results signal, there are four options,
none control state and all.
The nun and all options are almost clear why the former removes the recent signal from the design.
The latter adds that to all memory cells.
Understanding the impact of the two other options requires more knowledge about the design implementation
in each of us.
I will explain that later in this course.
Another option is the asynchronous result there is that signal is synchronous by default, if you want
to make that asynchronous, you should select this option.
The last parameter determines that the result is active, high or active low, the default value is
active high.
Note that when the sentence the school considers your memorizers or flipflops in your synthesised code,
it automatically as there is and clock signals to the generated article description.
These signals are not accessible in the high level C C++ code.
Our individual flipflops, the only memory cell elements in a sequential design.
The next lecture will handle this question by introducing you to Register's.
These are our takeaway messages, sequential circuits usually have a reset signal that puts that into
a known state, there is that signal can be active, high or active low.
There is a signal can be synchronous or asynchronous.
Now, the quiz question, let's consider these two flipflops, assume that the dimple has been one for
a long time.
If there is that signal is active, high and synchronous, then find the Q1 and Q2 signals.