User guide Simulators presented in this site have the goal
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1. User guide Simulators presented in this site have the goal of making easier understanding and learning logic circuits that in their more complex version are the building blocks of hardware in modern CPU Shown examples are circuits which performs simple operations Learning is easier thanks to the visive and animated representation of the circuits and the possibility of seeing how they operate systematically Introduction User can use menu on the left to choose which simulator wants to visualize By clicking on the language button it is possible switch easily from a language to another one This site is available in two language Italian and English Circuit Simulator gt FULL ADDER gt FULL ADDER 4 BIT INFO g LINGUA oded by Stefano Borzi amp amp Danilo Tascone Simple full adder This circuit is able to perform the sum between two binary digits caring also about a hypothetical carry in outgoing from another operation A B and Cin have the task of containing the digits which have to be summed A and B are the operands Cin is the carry in Cy A B Cin gt b e The graphic simulation has two modality The automatic mode which takes the inputs and shows how it performs sum and the step by step mode which allows to navigate on the circuit by focusing on each step for how long the user wants User just need to put the check in the predisposed square By clicking Start if we chase the aut2. he box In this case user will have a next step and a back step button as seen previously Inputs in full adders Aj e Bi are shown under its own entry 1 1 1 O 1 1 1 jo At the end of every operation under each picture representing a full adder user will be able to see the result of the performed operation in this zone ee T At the end of the entire process result will be contained there A3 B3 A2 B2 The carry out is propagated to the next full adder At each step the full adder which is performing the operation changes its colour passing to a red coloration It also shows the simulation of the operation which are being executed At each step a red signal indicates which part of the 4 bit number is being processed by the full adder The value between two red bars is the one which is being utilized 11111 A 101 0 B By passing the mouse over each single full adder user can see at natural size the operation which are being performed in it A4 B4 A3 B3 A2 B2 Al B1 D1 D2 D3 D4 A2 B2 CS Full subtractor Full subtractor circuit is similar to the full adder s one in how it works As full adder you can find an area where user can insert inputs values A substantial difference is the presence of a field named borrow in Bi rather than a Cin since a subtraction instead of a sum Is being performed A lt Bin 0 0 It works as the 4 bit full adder Functionali
3. omatic mode the program will execute normally If we chase step by step we will have two buttons Next Step Back step These buttons allows navigating in the simulation by going next and back Simbologia By clicking on this symbol we can access to an area on which you can find a brief explanation of the logic gates and about some circuits that are used in these simulators O By passing with the mouse over this icon you can visualize a little explanation on what the object does In the animation numbers highlighted in green are the ones which are being used in a certain operation Logic doors highlighted in red are the ones that in a certain step are active because they are performing certain operations by using the green highlighted values The ones which are in light blue have to be considered inactive at Arrows indicates the result of a given operation performed by red logic gates somes ts Each step has a brief description of the operation which are being performed XOR calcola la somma AND calcola il riporto 4 bit full Adder A four bit full adder has four in series full adder to perform the sum of two 4 bits binary numvers In these fields the user has to insert the values he wants to sum Just clicking start is requested to begin the simulation 1111 1010 E Step by step As in the simple full adder user can choose the automatic mode or the step by step mode just putting the check in t
4. ties disposed for this simulator are the same as the full adder s one For a more detailed explanation see the documentation above regarding 4 bit full adder 4 bit full subtractor
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