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Shift operators are used to shift data in a variable. This operator is essential for modeling hardware elements like shift registers, shift and add multipliers, etc. There are two types of shift operations: Logical shift: they shift the input and pad with zeros. For example, shift 1000 right twice will result in 0010. Verilog provides a variety of net types to enable the code to accurately model the hardware. wire is by far the most popular net type. It defines connectivity with no logical behavior or functionality implied. Other types include tri, wand, wor, triand, trior, supply0, supply1, tri0, tri1 and trireg to enable more advanced modeling of hardware. • Verilog gives the following constructs for concurrency: -always - assign - module instantiation - non-blocking assignments inside a sequential block Dept of CSE, IIT Madras 5 However… • The simulating machine is sequential. • no-matter how many processors I have, I can write one more process which also have to be simulated concurrently. not available in Verilog (user defined types, configurations, etc.). • Verilog - Provides comprehensive support for low-level digital design. - Not available in native VHDL • Range of type definitions and supporting functions (called packages) needs to be included. 4 Concept of Verilog "Module" • In Verilog, the basic unit of hardware Scalar and Vector Data type representation in Verilog. We have now learned about data types in Verilog. Now we move on to learn about the most important topics in Verilog; the module. We'll learn how to declare it and what are the essential components associated with it. Module declaration. The module forms the building block of a Verilog design. 4 CAD for VLSI 7 Variable Data Types • A variable belongs to one of two data types: - Net • Must be continuously driven • Used to model connections between continuous assignments & instantiations - Register • Retains the last value assigned to it • Often used to represent storage elements CAD for VLSI 8 Net data type - Different 'net' types supported for First we will create a Verilog file that describes an And Gate. As a refresher, a simple And Gate has two inputs and one output. The output is equal to 1 only when both of the inputs are equal to 1. Below is a picture of the And Gate that we will be describing with Verilog. An And Gate Let's get to it! Data Types Chris Spear Chapter 5284 Accesses Abstract System Verilog offers many improved data structures compared with Verilog. Some of these were created for designers but are also useful for testbenches. In this chapter, you will learn about the data structures most useful for verification. Keywords Data Type Array Size Array Type Packed Array Verilog is a hardware description language (HDL) that is used to design, simulate, and verify digital circuitry at a behavioral or register-transfer level. It is noteworthy for a reasons that distinguish it from "traditional" programming languages: There are two types of assignment, blocking and non-blocking, each with their own uses and semantics. Many data types including user Has limited number of data types. defined, arrays (multi-dimensional) There are no user defined supports, physical si