Verilog Digital System Design by Zainalabedin Navabi

By Zainalabedin Navabi

This rigorous textual content indicates electronics designers and scholars how one can set up Verilog in refined electronic structures design.The moment variation is totally up-to-date -- besides the various labored examples -- for Verilog 2001, new synthesis criteria and insurance of the recent OVI verification library.

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Verilog’s main construct for procedural specification of hardware is the always statement used in the example of Fig. 10. The example shown in Fig. 10 is still another Verilog code for our multiplexer example discussed previously. In this code, an always statement, which is the main procedural body of Verilog, encloses an if-else statement that assigns a or b to w depending on the value of s. 6 Module instantiations Still another way of describing a component is by describing its subcomponents and instantiating and wiring these lower-level components to form the intended upper-level design.

The charge storage feature at this level of abstraction in Verilog makes this language capable of describing dynamic complimentary metal oxide semicondutor (CMOS) and metal oxide semiconductor (MOS) circuits. Gate level. Gate level primitives with predefined parameters provide a convenient platform for netlist representation and gate level simulation. For more detailed and special purpose gate simulations, gate components may be defined at the behavioral level. Verilog also provides utilities for defining primitives with special functionalities.

1 are concurrently active. This means that we cannot decide on a pre-determined order in which these gates perform their operations. Instead, while hand simulating this circuit, we evaluate a gate only when its input changes. Similarly, the four assign statements that we discussed for representing this circuit are regarded as concurrent. The order in which these statements appear in a concurrent body of Verilog is not important. As in its corresponding hardware, each statement only evaluates its boolean expression when an event occurs on one of its right-hand side signals.

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