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Digital System Design

Verilog:

Data Types and Modules

Dr. Bassam Jamil

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Topics

Data Types

Modules

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Data Types

reg is a variable with a storage. If the register is

assigned a value, it remains until it is assignedanother value.

wire represents a physical connection, and doesnot have a storage.

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Wire and Reg value levels

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Vectors

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Constants

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Modules

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Port List

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Port Rules

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Module Instantiation and Port Matching

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Modeling Types In Verilog

There Modeling types a shown

Structural Consists of module instantiations and connectivity's

Will show couple of examples of structural modeling

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Structural Model Example: 4-bit Counter

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Structural Model Example: 4-bit Counter

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Structural Model Example: 4-bit Counter

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Structural Model Example: 4-bit Counter

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Structural Model Example: 4-bit Counter

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Structural Model Example: 4-bit Comparator

Design 4-bit comparator using 2-bit comparatorBelow is the block diagram of the 4-bit comparator

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Structural Model Example: 4-bit Comparator

2-bit compactor

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Structural Model Example: 4-bit Comparator

First lets design the 2-bit comparator

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Structural Model Example: 4-bit Comparator

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Structural Model Example: 4-bit Comparator

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Structural Model Example: 4-1 MUX