vasupinfinity.blogg.se

4*4 MULTIPLIER VERILOG CODE CODE

The figure consists of two individual 2:1 multiplexers, connected by the two select lines s0 and s1. You can observe how the RTL of 4:1 MUX in dataflow is different from the gate-level modeling. module m41 ( input a,Īssign out = s1 ? (s0 ? d : c) : (s0 ? b : a)

4*4 MULTIPLIER VERILOG CODE CODE

Thus, the final code for the 4:1 multiplexer using data-flow modeling is given below. Further, if s0 is high, d OR b will get transferred to the out variable, depending on the s1 select line, else c OR a will be the output. This shows that if s1 is high, the (s0 ? d : c) block will be executed, else (s0 ? b : a) will be executed. assign out = s1 ? (s0 ? d : c) : (s0 ? b : a) This operator works similar to that of C programming language. A ternary operator ? is used here to implement the logic. Using the assign statement to express the logical expression of the circuit. Start with the module and input-output declaration. s1.s0) Verilog code for 4×1 multiplexer using data flow modeling It is necessary to know the logical expression of the circuit to make a dataflow model. In Verilog, the assign statement is used in data-flow abstraction. It is described through the data flow through the combinational circuits rather than the logic gates used. The dataflow modeling represents the flow of the data. It is clear that the gate-level modeling will give the exact involved hardware in the circuit of the system. Notice the resemblance between the logic circuit of 4:1 MUX and this picture. This hardware schematic is the RTL design of the circuit. Similarly for the rest of the two gates and (T1, a, s0bar, s1bar), (T2, b, s0bar, s1), (T3, c, s0, s1bar), (T4, d, s0, s1) Here s0bar and s1bar are the output to the first and second NOT gate respectively and s0 and s1 are the input to the first and second NOT gate. Here’s how you would do it for the two NOT gates. Separate the list for a particular gate by appropriate brackets, if there exists more than one same logic gate. Time for us to write for the logic gates. Example: signals that are emerging from the NOT gate. Note that the intermediate signals are those that are not involved in the port list. All the top University and research institutions always use open source tools for learning and research work.The intermediate signals are declared as wires.

Open Source is good path for beginner or profile switching mode.

But while learning phase in initial phase of career, where student is yet to decide upon the career path, open source tools helps to learn on its pace and understanding capacity.

As the complete the team is dedicated towards delivering the product on time, commercial tools are must for those projects.

While working in production cycle in industry, commercial tools are used to achieve the desired performance parameters in a stipulated time frame.

Open source gives total freedom to research, learn and develop projects which help to decide which profile is compatible with students abilities.

As a beginner or learning phase, anyone needs 100 % FREEDOM to explore the concepts, design and also achieve different performance parameters.

NLDM/CCS/.) or when the whole file is using different basic units, or even when the timing models are covering slightly different data points. Identical, within 1%, within 5%, within 10%) It would be great if this check would even be done in case of different timing models (e.g. Nanometers)? Are the same Timing models used? (NLDM/CCS/ELDM/none)? Are the two liberty files possibly covering the same cell? (Do they have the same number of inputs and outputs?) How far off are the timing numbers? (E.g.

are the power models missing in one of the files?) Are the same basic units used? (e.g.

This should help the user to answer the following questions: Which parts of the files are equal? Which parts of the file are different? (e.g. The second part is to enhance the tool to be able to compare 2 different liberty files. Display meaningful aggregation data like Minimum/Maximum values for tables. Develop a tool which takes a liberty file and generates a report about all the contents found in the file, it should display the tables and provide visualization (diagrams/graphs/3D) the values where possible.