- Fact:
- You can use the function key F5 to toggle the display of the signal labels
- Example: run the circuit simulation
in the previous example
Press the function key F5 and you will see the following:
- Note:
- Yo do not want to
display the
signal labels because
you will use
many signals in
your projects
- I tell you this because it will give you some idea on how the circuit simulation works....
- Yo do not want to
display the
signal labels because
you will use
many signals in
your projects
- Grouping (existing) signals
- After defining the
signals:
Sig(a, 10); // Signals: a[0], a[1], ........., a[9] Sig(b, 5); // Signals: b[0], b[1], ..., b[4]
you can group some of the signals together:
( signal1, signal2, ..., signalN ) = a group of signals A group of signal "counts" as ONE single signal !!
This is just like Java:
{ Statement1; Statement2; // "Counts" as ONE single statement !!! ... StatementN; }
- After defining the
signals:
- Example:
- The And-gate has the following
syntax:
And( Coord, InputSignal, OutputSignal );
The InputSignal consists of only one signal !!!
- To use
an input of
two signals to
the And-gate, we
group the input signals
as follows:
And ( Coord, ( input1, input2 ), output );
- The And-gate has the following
syntax:
- Example Program:
(Demo above code)
- Prog file: click here
How to run the program:
- Right click on link and
save in a scratch directory
- To compile: cs355sim and
- To run: ./simex
- Fact:
- Often, a group of
signals
is composed of
signals from
different sources
- When we compose
a group of signals,
we often use
a sub-range of signals
from
different sources
- In logic-sim, there is a convenient way to denote sub-range of the signal array.
- Often, a group of
signals
is composed of
signals from
different sources
- Recall:
Sig( a, 10 ); // Define a range of signals: a[0] ... b[9] Sig( b, 5 ); // Define signals: b[0] .. b[4]
- We can compose a
group of signals
using a range notation
x[i]-x[j]
as follows:
(a[0]-a[3]) means: a[0], a[1], a[2], a[3] (4 signals !) (a[3]-a[0]) means: a[3], a[2], a[1], a[0] (4 signals !) (a[0],a[3]) means: a[0], a[3] (2 signals !) (a[3],a[0]) means: a[3], a[0] (2 signals !)
- I will show you an example of range-notation of signals later (in the next webpage) where we discuss how to use the Multiplexor component in the logic simulator