Posted on Feb 4, 2014

Analysis of simple digital circuits means to determine how the circuit behaves, which is represented for its truth table. So, with this aim in mind, lets organise the analysis step by step (as explained in Unit 1. 3 ) : For instance, here you are the circuit from EX1A`s Fig. 2b (NOTE: The circuits in Fig. 2 are only samples of simple comb

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inational circuits using logic gates. Your instructor may change them for other similar ones. In this way, your aim is to analyse the circuit proposed in classroom, see your class group agenda ( 3GM1 or 3GT3 ): Analysing an example from a book: Floyd, 10e, Chapter 5. Visit the book`s webpage and study the slides which are available. Be aware that your instructor may have changed this design by another similar, please check your particular class group agenda ( 3GM1 or 3GT3 ):. Rewrite the circuit using logic gates transformations so that it can be easily captured in Proteus-ISIS. Insert your circuit inside a subcircuit box taking the previous example as the starting point. Obtain the circuit`s truth table: continue the transformation adding the missing variables so that the products are transformed into minterns (sum of minterms), or the sums are transformed into maxterms (product of maxterms). In order to check that the Lattice software is correctly installed in your portable computer or the lab, just run the demonstration project available in Unit 1. 5A ( here ), which is an Hexadecimal to BCD decoder. It it synthesised for a GAL22V10 sPLD device (see Unit 1. 6 ). The project is composed of different files, a mix of schematics and VHDL. So, the idea is clear: let`s try to use VHDL instead of schematics of logic circuits. So, from now, all your projects are going to be VHDL-only, in a way that we`ll let the system draw the...

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