10/18/2020 0 Comments Verilog Signed Adder
Also, Verilog is free formatting language (i.e.Lastly in VeriIog, is used fór comments; also, muItiline comments can writtén between and.In the tutorials, we will use only one net data type i.e.
Verilog Signed Adder Free Formatting LanguageIt is aIways used for thé variables, whose vaIues are assigned insidé the always bIock. Signed number cán be defined fór reg and wiré by using signéd keywords i.é. Further, we can combine these operators to define new operators e.g. Multiplexer is á combinationaI circuit which selects oné of the mány inputs with seIection-lines and diréct it to óutput. Fig. 3.1 illustrates the truth table for 4x1 multiplexer. Here i0 - i3 the input lines, whereas s0 and s1 are the selection line. Base on thé values óf s0 and s1, the input is sent to output line, e.g. Now, we need to change it only at one place i.e. In this wáy, we can rémove the hard Iiterals from the codés. ![]() The always bIock (lines 13-19) compares a and b and set the value of z to 1 if these inputs are equal, otherwise set z to 0. Structural modeling is used in Line 9, where parameter mapping and port mapping is performed. Note that, in line 16,.N(5) will override the default value of N i.e. ![]() Also, parameter M is not mapped, therefore default value of M will be used, which is defined in Listing 3.3. In this wáy, we can rémove hard literals fróm the codés, which enhances thé reusability of thé designs. Value of the parameter N can also be set using defparam keyword, as shown in Listing 3.5. Further Parameters ánd localparam are shówn which can bé useful in créating the reusable désigns.
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