Randell B., Russell L.J.'s ALGOL 60 implementation PDF

By Randell B., Russell L.J.

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Example 2-5 Comments / / this is a comment /* this is also a comment that spans multiple lines */ NUMBERS If you have the number 10, do you know what base it is? Is it 102? 1010? 1016? How many bits are needed to hold it? In Verilog, the default is base ten, so the answer is 1010. In hardware modeling you might want to represent numbers of different bases and different bit widths. Why does it matter how many bits are used to hold the number? In simulation, the number of bits may matter for some operations.

Figure 3-5 Mux4 Hierarchy Expanded A hierarchical name can reference any object in a simulation. Hierarchical names have two forms: a downward path from the current module, or a name that starts at a top-level module and provides a complete path. ) to separate the elements in the path of a hierarchical name. Example 3-5 shows some hierarchical names. sel_n Connect by Name All of the hierarchy built by module instances in Example 3-3 and Example 3-4was built by matching the port declaration order to the used to create the connections.

You will note that the results of that simulation give no indication of the inputs and outputs of the circuit, so it is difficult to tell if the circuit really works correctly. Therefore, the first behavioral aspects of the Verilog language we will look at are the parts of the language you use to print out results. 34 Verilog Quickstart STARTING PLACES FOR PLACES FOR BLOCKS OF BEHAVIORAL CODE Behavioral code is like programming in a computer language—with one large exception. Behavioral code adds a concept of time.

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ALGOL 60 implementation by Randell B., Russell L.J.

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