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Altera_Forum's avatar
Altera_Forum
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13 years ago

Help with problem

Using the hierarchy design procedure and Quartus II software, design a digital code converter, which takes a 4-bit BCD input, and based on the value of the select bit the converter either generates the Excess3 or the Gray code of the input BCD at the output. (s0=0 the output should be excess3, s0=1 the output should be gray code.) Use only Decoders and Multiplexers in your design.

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    13 years ago

    If you know the functions (derived from truth table) for bcd to excess3 and bcd to graycode, model the HDL designs using any of the 3 modelling techniques (gate level, dataflow, behavioral). Also model a 2:1 mux.

    let the modules be 2_1mux.v , bcd2excess3.v and bcd2gray.v

    The following is my rough sketch of how the final design will be

    // module and port declaration

    //instantiations

    excess3.v (.input(bcd),.en(!s0),.ouput(excess3))

    gray.v (.input(bcd),.en(s0),.ouput(gray))

    2_1mux.v (.data1(excess3),.data2(gray),.sel(s0),.output(output))

    HTH..